![](https://www.kindai.ac.jp/data/images/professor/937.jpg)
NOBUKI Tohru
Department of Mechanical Engineering | Professor |
■Researcher basic information
J-Global ID
Research Keyword
- 新機能材料 破面解析 破壊靭性 衝撃破壊 fracture toughness impact fracture
Research Field
■Career
Career
- 2008 - Today Kindai UniversityFaculty of Engineering
- 2017/09 - 2018/08 -Centre national de la recherche scientifique, CNRS, FranceInstitut de Chimie et des Matériaux de Paris Est, ICMPE
- 2007/09 - 2008/03 Tokai UniversitySchool of Engineering非常勤講師(兼務)
- 2005 - 2008 -東京大学・先端科学技術研究センター(先端研)協力研究員(兼任)
- 2005 - 2008 東海大学特定研究員
- 2004 - 2005 -近畿大学研究員(兼任)
- 2004 - 2005 Kindai University
Educational Background
■Research activity information
Award
Paper
- Aoki Takanori; Hatate Minoru; Nobuki TohruJournal of Japan Foundry Engineering Society Japan Foundry Engineering Society 94 (10) 606 - 613 1342-0429 2022/10 [Refereed]
Spheroidal graphite cast iron (SG iron) is produced from pig iron, steel scrap, and return material, and recently, there is a trend to increase Mn content in steel scrap. Since Mn contained in SG iron acts as cementite stabilizing element during eutectic solidification and as pearlite promoting element during eutectoid transformation, it increases strength but decreases machinability and toughness. In this study, in order to investigate the effect of Mn mixed from steel scrap, static mechanical properties were investigated by varying the Mn content in SG irons with about 3%Si (3%Si series) and about 4%Si (4%Si series). In the 3%Si series, the tensile strength of SG irons increased as the amount of Mn increased, but when it exceeded 600MPa, the increasing tendency became smaller. In order to increase the tensile strength without reducing the elongation, heat treatment was conducted by normalizing from temperature range in the dual-phase region of ferrite and austenite. The heat-treated SG irons had a fine mixed structure of ferrite and pearlite, and strength was confirmed to improve. It was found that the effect of Mn on the transformation process by normalizing expands the heat treatment temperature range in which the mixed structure can be obtained. In the 4%Si series, when the amount of Mn is low, the tensile strength and elongation had excellent properties. However, it was clarified that when the area fraction of pearlite becomes 10% or more as Mn content increases, the elongation greatly decreases and embrittlement occurs. These results suggest that since embrittlement is improved by conducting ferritized annealing, even if the amount of Mn is large, embrittlement of SG iron will not occur by adopting a ferrite single phase. - Hatate Minoru; Aoki Takanori; Nobuki TohruJournal of Japan Foundry Engineering Society Japan Foundry Engineering Society 93 (12) 809 - 815 1342-0429 2021/12 [Refereed]
Thermal expansion characteristics and static mechanical properties of 24%Ni-12%Co-2%C-1%Si low thermal expansive spheroidal graphite cast iron were investigated by varying the amount of martensite by changing cooling rates from 1173K of solution treatment temperature. The microstructure of the as-cast sample consisted of graphite and matrix of 50% martensite and 50% austenite, and its coefficient of thermal expansion was about 6 × 10-6/K at 373K. The coefficient of thermal expansion of the sample, which was subjected to solution treatment, dropped to about 4 × 10-6/K owing to inverse-transformed austenite from martensite. The amount of martensite changed with the cooling rate and it increased when cooled slower than air cooling. The critical cooling rate for martensitic transformation was determined to be about 1 K/s from observation of microstructure and change of coefficient of thermal expansion. The coefficient of thermal expansion at 373K of the samples with higher amount of inverse austenite became lower because the martensite suppressed Invar effects which contribute to low thermal expansive characteristics. Therefore, the coefficient of thermal expansion at 373K depended on the amount of martensite. The tensile strength and hardness of the samples increased with increase in the amount of martensite and tensile characteristics was found to be greatly affected by change with the amount of martensite. However, as elongation of the samples was 2 to 5% regardless of the amounts of martensite or austenite, materials characteristic included poor ductility. - 旗手 稔; 青木 隆謙; 信木 関鋳造工学 = Journal of Japan Foundry Engineering Society 日本鋳造工学会 93 (8) 470 - 476 1342-0429 2021/08 [Refereed]
- Takafumi Ikeda; Makiko Yonehara; Toshi-Taka Ikeshoji; Tohru Nobuki; Minoru Hatate; Kosuke Kuwabara; Yasuhiko Otsubo; Hideki KyogokuCRYSTALS MDPI 11 (5) 2073-4352 2021/05 [Refereed]
Recently, high-entropy alloys (HEAs) have attracted much attention because of their superior properties, such as high strength and corrosion resistance. This study aimed to investigate the influences of process parameters on the microstructure and mechanical properties of CoCrFe NiTiMo HEAs using a laser-based powder bed fusion (LPBF) process. In terms of laser power and scan speed, a process map was constructed by evaluating the density and surface roughness of the as-built specimen to optimize the process parameters of the products. The mechanical properties of the as-built specimens fabricated at the optimum fabrication condition derived from the process map were evaluated. Consequently, the optimum laser power and scan speed could be obtained using the process map evaluated by density and surface roughness. The as-built specimen fabricated at the optimum fabrication condition presented a relative density of more than 99.8%. The microstructure of the as-built specimen exhibited anisotropy along the build direction. The tensile strength and elongation of the as-built specimen were around 1150 MPa and more than 20%, respectively. - Nobuki Tohru; Hatate Minoru; Yamada Shohei; Miyamoto YutakaJournal of Japan Foundry Engineering Society Japan Foundry Engineering Society 92 (10) 529 - 536 1342-0429 2020/10 [Refereed]
To examine the effects of nickel addition on not only static tensile properties and impact properties but also fracture toughness, castings of two sizes, namely heavy-section (600mm thickness) and Y-block (75mm thickness) spheroidal graphite cast irons, with the same chemical composition were prepared, and attempts were made to clarify and evaluate the fracture toughness. CT specimens of 25 mm in thickness were then obtained from the two materials by machining, according to ASTM regulations for heavy sectional castings, and fatigue pre-cracks were formed on the specimens by applying some 20 kilo-cycles of repeated axial loads using a hydraulic servo fatigue tester at room temperature. Next, 60 degree-V shaped side-grooves were formed on the CT specimens after inducing an approximately 2 mm large fatigue pre-crack at the machined crack tip, and CT testing was then performed on the specimens using an Instron type material tester at 296K (R. T.) and 233K. The applied load (L) and load-line-displacement (LLD) of the CT specimens were recorded on computer by the unloading elastic compliance method based on the JSME method. The results showed that two kinds of almost fully ferritic spheroidal graphite cast irons were obtained from heavy sectional sands molds. The microstructures and mechanical properties of these materials were that of typically normal spheroidal graphite cast irons ones. (ie : UTS > 300 MPa, Elongation > 20%, HV > 130)
The obtained fracture toughness (JIc) of these specimens was 26-33 and 10-23 kN/m at R. T. and 223K, respectively. The converted fracture toughness (KIc) values from estimate equation showed > 45 MPa at 233K of heavy-section specimens added with 0.6% Ni. The calculated fracture toughness (converted KIc)) and Charpy impact characteristics of these materials showed good correlation with parameters when impact yield stress was applied in impact testing.
- Nobuki Tohru; Crivello Jean-Claude; Cuevas Fermin; Joubert Jean-MarcInternational Journal of Hydrogen Energy PERGAMON-ELSEVIER SCIENCE LTD 44 (21) 10770‐10776 - 10776 0360-3199 2019 [Refereed]
Mechanical alloying is widely used for the synthesis of hydrogen storage materials. However, amorphization and contamination triggered by long-time milling are serious drawbacks for obtaining efficient hydrogen storage. In this work, short-time ball milling synthesis is explored for a representative hydride forming compound: TiNi. Through structural, morphological and chemical characterizations, we evidence that formation of TiNi is complete in only 20 min with minor Fe contamination (0.2 wt%). Cross-sectional analysis of powder stuck on milling balls reveals that alloy formation occurs through the interdiffusion between thin layers of co-laminated pure elements. Hydrogenation thermodynamics and kinetics of short-time mechanically alloyed TiNi are similar to those of coarse-grained compounds obtained by classical high-temperature melting. Mechanical alloying is a suitable method for fast and energy-efficient synthesis of intermetallic compounds such as TiNi. (C) 2019 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. - Nobuki Tohru; Okuzumi Yuki; Hatate Minoru; Crivello Jean-Claude; Cuevas Fermin; Joubert Jean-MarcMaterials Transactions JAPAN INST METALS 60 (3) 441‐449(J‐STAGE) - 449 1345-9678 2019 [Refereed]
A series of Mg-Ni or Mg-Cu alloys with Mg content comprised between 55 and 77 at% Mg was prepared by mechanical alloying with the aim of synthesizing Mg2Ni and Mg2Cu phases, respectively. Their morphology and structural properties were characterized by scanning electron microscopy (SEM) and X-ray Diffraction (XRD). High Pressure Differential Scanning Calorimetry (HP-DSC) was used to evaluate their hydrogenation properties. For the Mg-Ni series, 8 hours of milling were enough to synthesize the Mg2Ni alloy. The highest reversible hydrogen capacity (2.8 mass%) was obtained for 70 at% Mg sample without the need of any activation treatment. For Mg-Cu series, 83 mass% of Mg2Cu was obtained after 4 hours of milling. From the view point of alloying composition, Mg-rich samples show better crystallinity of Mg2Cu phase. Under hydrogen, the Mg2Cu powder mixtures decompose and form MgH2 hydride storing 1.56 mass% of hydrogen for 66 at% Mg. For the Mg-Ni series, Cu or Al elements (1 to 10 mass%) were added during milling. HP-DSC runs show that they destabilize the hydride phase due to alloying effects. - Tohru Nobuki; Taro Moriya; Minoru Hatate; Jean-Claude Crivello; Fermin Cuevas; Jean-Marc JoubertMetals MDPI AG 8 (4) 1 - 11 2075-4701 2018/04 [Refereed]
This study aims to clarify the influence of the Spark Plasma Sintering (SPS) method on structural morphology, mechanical properties and also functional characteristics, such as hydrogen absorbing properties, for titanium-iron intermetallic compounds. We could synthesize B2-TiFe phase using mechanical alloying (MA) during 3 h and SPS treatment of 5 min at 500–1000◦C, which was confirmed by XRD and Electron Probe Microanalyzer (EPMA) measurements. In addition, the synthesized TiFe intermetallic compound has been found to absorb hydrogen with high kinetics in both high pressure Differential Scanning Calorimetry (DSC) and Pressure-Composition-Temperature (PCT) measurements. Therefore, we have successfully developed TiFe alloy in bulk form from initial raw powders by using a combination of short period mechanical alloying and SPS heat treatment. This combined route enhances the potential of the SPS method to synthesize new materials. - SAKINO Yoshihiro; MATSUMOTO Naoyuki; INOSE Koutaro; NOBUKI Tohru; TSUTSUMI SeiichiroKou kouzou rombunshuu Japanese Society of Steel Construction 25 (99) 99_23 - 99_30 1880-9928 2018 [Refereed]
Arc welding is commonly applied to high-strength steel for buildings (H-SA700). However, the heat-affected zones of H-SA700 often become soft and the yield stress decreases compared to that of the base metal owing to the large heat input of arc welding. In this study, laser welding was applied to H-SA700. The residual stress, hardness, mechanical property and fracture toughness of H-SA700 after laser welding were examined and the results were compared with those of arc welding. As a result, the softened area of H-SA700 welded using laser welding was considerably smaller than that obtained using arc welding, and the yield stress was the same as that of the base metal. Fracture pass deviation (FPD) was observed in the Charpy impact test.
- NOBUKI TohruMaterials Science and Applications 8 (13) 948 - 958 2017/12 [Refereed]
- Tohru Nobuki; Minoru Hatate; Akihiko Ikuta; Yusuke Kawasaki; Naoji HamasakaINTERNATIONAL JOURNAL OF METALCASTING SPRINGER INTERNATIONAL PUBLISHING AG 11 (1) 52 - 60 1939-5981 2017/01 [Refereed]
The effects of nitro-carburizing or nitriding treatments on rotating-bending fatigue properties were investigated on four kinds of pearlitic ductile cast iron samples. In this study, we produced alloyed ductile cast iron samples containing V (0.1 %), Al (0.1 %) + Cr (0.1 %) and Al (0.1 %) + V (0.1 %). Tensile and hardness characteristics of the nitro-carburized samples were compared to those of the nitrided ones and as-cast ductile cast irons without alloying element. The iron nitride (gamma'-Fe4N) formed on the surfaces of the nitride samples, and the iron complex nitrides (epsilon-Fe2-3N) formed on the surfaces of the nitro-carburized ones. As a result, comparing with the same alloying content, the tensile strength and elongation of the nitro-carburized samples show the higher value than that of nitride ones. The micro-Vickers hardness tends to decrease with increase in distance from the sample surfaces. From the viewpoint of the nitride method, the hardness of nitride samples shows the higher value than that of the nitro-carburizing samples. Also, the maximum micro-Vickers hardness of nitrided layer at distance of 0.03 mm from sample surfaces increased with the increasing practical depth of nitrided layer. Therefore, the fatigue lives existing in the higher stress ranging from 500 to 650 MPa were found to be longer in the order of as-cast, nitro-carburized and nitrided samples. However, the fatigue limit of the lower stress zone existing at 410-450 MPa became no longer significant on endure limit by differences of nitiriding method. This means that the larger nitride layer depth and/or the higher hardness in the vicinity of surface acts to delay the fatigue crack generation on the fatigue characteristics of ductile cast iron samples. - Impact characterisitics and mechanical properties of copper alloyed shperoidal graphite cast ironsNOBUKI Tohru; HATATE Minoru; KARASUDANI Takeshi; OKUZUMI YukiFoundry Trade Journal 190 (3740) 294 - 298 2016/12 [Refereed]
- 遠藤 栄治; 生田 明彦; 信木 関; 旗手 稔; 中山 英樹鋳造工学 = Journal of Japan Foundry Engineering Society 日本鋳造工学会 88 (5) 276 - 281 1342-0429 2016/05 [Refereed]
This study aims to investigate the influence of tempering temperature on strength, hardness, and wear characteristics of alloy tool steel casting. Test samples added with 0.5mass%Ti with lower C and Cr contents than those in SKD11 (JIS G4404) were manufactured by the investment casting process, and tempered at temperatures 453K, 573K, 673K, 773K, and 873K after quenching from 1293K. The amount of M7C3 type Cr carbides decreased, and continuity of the carbides was greatly reduced with the decrease of C and Cr contents. In addition MC type Ti carbides were observed in the matrix microstructure. Carbide structure did not change with varying tempering temperature. Although hardness tended to decrease with increasing tempering temperature, the hardness increased by secondary hardening at temperature of 773K and significantly decreased at 873K. Bending strength did not change largely with tempering temperature and showed maximum value at 453K. Fraction of wear loss did not change during tempering temperature from 473K to 773K but it increased significantly at 873K. The optimum tempering temperature for this alloy steel was found to be 453K from experimental results of strength, hardness, and wear characteristics.
- 生田明彦; 旗手稔; 信木関鋳造工学 Japan Foundry Engineering Society 88 (1) 37 - 42 1342-0429 2016/01 [Refereed]
The machinability of austempered spheroidal graphite cast iron made by continuous casting (A-FCD600) was investigated. In this study, spheroidal graphite cast iron made by continuous casting (FCD600) was used to examine the influence of the austempering on machinability. In addition, austempered gray cast iron made by continuous casting (FC250) was used to examine the influence of the morphology of graphite on machinability. From the results of a tool wear test using continuous turning, the machinability decreased in the order of FC600, A-FC250, and A-FCD600. When relative machinability ratings between each material were calculated using tool life equations decided by the result of the tool wear test, the machinability of A-FCD600 was approximately 1.9 times inferior to FCD600, and approximately 1.3 times inferior to A-FC250. One characteristic of A-FCD600 was that its mechanical properties were relatively near steel. Therefore, a similar tool wear test was carried out with a P10 cemented carbide tool for steel. In this case, the tool life extended 25% compared to the K10 cemented carbide tool for cast iron. These results suggest that tool life can be improved in A-FCD600 cutting when tools for steel are used.
- Akihiko Ikuta; Minoru Hatate; Tohru NobukiMATERIALS TRANSACTIONS JAPAN INST METALS 57 (8) 1339 - 1344 1345-9678 2016 [Refereed]
In this study, the machinability of austempered spheroidal graphite cast iron made by different casting methods was investigated. Spheroidal graphite cast iron samples made by sand mold casting and continuous casting, respectively ADI-S and ADI-C, were used. From the results of cutting tests, the machinability of ADI-C was always excellent compared with that of ADI-S at cutting speeds from 100 to 365 m/min. The feed and thrust forces of ADI-S were higher than those of ADI-C at high cutting speeds, although their-cutting resistance was almost the same at low cutting speeds. In addition, the microstructure of ADI-S chips was found to be greatly deformed near the chip-tool interface for ADI-S compared with ADI-C. It has been reported that there always exists retained austenite in austempered spheroidal graphite cast iron, and that the retained austenite transforms to deformation-induced martensite on the machined surface when the austempered spheroidal graphite cast iron is machined. From the results of the comparative analysis of ADI-S and ADI-C, the average relative volume ratio of retained austenite increased with increasing cutting speed for both ADI-S and ADI-C, and was about double in the case of ADI-S at high cutting speeds such as 365 m/min. From these results, it is clear that the retained austenite in both ADI-S and ADI-C does not transform to deformation induced martensite at high cutting speeds, and that ADI-C can be machined at cutting temperatures and with cutting resistances lower than those necessary for ADI-S, suggesting that the machinability of ADI-C is better than ADI-S. - Akihiko Ikuta; Minoru Hatate; Tohru NobukiMATERIALS TRANSACTIONS JAPAN INST METALS 57 (9) 1575 - 1580 1345-9678 2016 [Refereed]
The machinability of austempered spheroidal graphite cast iron made by continuous casting (A-FCD600) was investigated. In this study, spheroidal graphite cast iron made by continuous casting (FCD600) was used to examine the influence of the austempering on machinability. In addition, austempered gray cast iron made by continuous casting (FC250) was used to examine the influence of the morphology of graphite on machinability. From the results of a tool wear test using continuous turning, the machinability decreased in the order of FC600, A-FC250 and A-FCD600. When relative machinability ratings between each material were calculated using tool life equations decided by the result of the tool wear test, the machinability of A-FCD600 was approximately 1.9 times inferior to FCD600, and approximately 1.3 times inferior to A-FC250. One characteristic of A-FCD600 was that its mechanical properties were relatively near steel. Therefore, a similar tool wear test was carried out with a P10 cemented carbide tool for steel. In this case, the tool life extended 25% compared to the K10 cemented carbide tool for cast iron. These results suggest that tool life can be improved in A-FCD600 cutting when tools for steel are used. - HATATE MINORU; NOBUKI TOORU; IKUTA AKIHIKO; HAMASAKA NAOJI; KAWASAKI YUSUKE鋳造工学 Japan Foundry Engineering Society 87 (6) 382 - 387 1342-0429 2015/06 [Refereed]
The effects of nitrocarburizing or nitriding treatments on rotating-bending fatigue properties were investigated on four kinds of pearlitic FCD700 (JIS G5502) -class ductile cast iron samples with V (0.1%), Al (0.1%), Al (0.1%) & Cr (0.1%) and Al (0.1%) &V (0.1%). Tensile and hardness characteristics of the nitrocarburized samples were compared to those of the nitrided ones and as-cast FCD700 without alloying element. Fe4N nitride formed on the surfaces of the nitrided samples, while Fe4N and Fe2-3N nitrides formed on the surfaces of the nitrocarburized ones. The practical nitrided depth and micro-Vickers hardness at 0.03mm below the surface in the nitride layer of the nitrided samples were larger and higher than those of nitrocarburized ones, respectively. The addition of alloying elements to the nitrided and nitrocarburized samples increased the practical nitrided depth and hardness in the vicinity of the surface, compared to the samples without alloying element. The fatigue existing in the higher stress range from 500 to 650MPa was found to be longer in the order of as-cast FCD700, nitrocarburized and nitrided samples. However, the fatigue limit at 107 cycles in the lower stress range ranged from 410 to 450MPa and no significant difference was seen among the nitrocarburized and nitrided samples. The improvement of fatigue characteristics by nitrocarburing and nitriding treatments is considered to be efficient only in higher stress ranges. The fatigue strength in high stress ranges is considered to be related to the difference in the initiation time of the fatigue crack. This suggests that the larger the nitrided depth and/or the higher the hardness in the vicinity of surface promoted by the addition of alloying elements, the more delayed will the crack initiation be.
- IKUTA AKIHIKO; HATATE MINORU; NOBUKI TOORU鋳造工学 Japan Foundry Engineering Society 87 (4) 231 - 238 1342-0429 2015/04 [Refereed]
In this study, the machinability of austempered spheroidal graphite cast iron made by different casting methods was investigated. Spheroidal graphite cast iron samples made by sand mold casting and continuous casting, respectively ADI-S and ADI-C, were used. From the results of cutting tests, the machinability of ADI-C was always excellent compared with that of ADI-S at cutting speeds from 100 to 365m/min. The feed and thrust forces of ADI-S were higher than those of ADI-C at high cutting speeds, although their cutting resistance was almost the same at low cutting speeds. In addition, the microstructure of ADI-S chips was found to be greatly deformed near the chip-tool interface for ADI-S compared with ADI-C. It has been reported that there always exists retained austenite in austempered spheroidal graphite cast iron, and that the retained austenite transforms to deformation-induced martensite on the machined surface when the austempered spheroidal graphite cast iron is machined. From the results of the comparative analysis of ADI-S and ADI-C, the average relative volume ratio of retained austenite increased with increasing cutting speed for both ADI-S and ADI-C, and was about double in the case of ADI-S at high cutting speeds such as 365m/min. From these results, it is clear that the retained austenite in both ADI-S and ADI-C does not transform to deformation-induced martensite at high cutting speeds, and that ADI-C can be machined at cutting temperatures and with cutting resistances lower than those necessary for ADI-S, suggesting that the machinability of ADI-C is better than ADI-S.
- KAWASAKI YUSUKE; SUMIOKA JUN'ICHI; HATATE MINORU; NOBUKI TOORU; HAMASAKA NAOJI; YAMAGUCHI YASUFUMI鋳造工学 Japan Foundry Engineering Society 87 (1) 3 - 8 1342-0429 2015/01 [Refereed]
The effects of nitriding treatment on rotating-bending fatigue properties were investigated on nine kinds of pearlitic ductile cast iron samples with Mo (0.1%), Cr (0.1%), V (0.1%), Al (0.1, 0.3, 0.5%), Al (0.1%) & Cr (0.1%), Al (0.1%) & V (0.1%) and without alloying element. The white layer of Fe4N nitride formed on the surfaces of all the samples was about 0.01mm in thickness. The practical nitrided depth and micro-Vickers hardness at 0.03mm below the surface in the nitride layer of the sample without alloying element were 0.148mm and 549HV, respectively. The addition of alloying elements to nitrided samples increased the practical nitrided depth and hardness in the vicinity of the surface. In the nitrided samples, fatigue existing in the higher stress range from 500 to 650MPa was found to be longer in the order of no addition, single addition, and double addition of alloying elements. However, the fatigue limit at 107 cycles in the lower stress range ranged from 410 to 450MPa and no significant difference was seen among the nitrided samples. The improvement of fatigue characteristic by the addition of the alloying element is considered to be efficient only in the higher stress range. The fatigue strength in the high stress range is considered to be related to the difference in the initiation time of the fatigue crack because the spacings of the striation formed on the fracture surfaces are more or less the same in all the samples. This suggests that the larger the nitrided depth and/or the higher the hardness in the vicinity of surface promoted by the addition of alloying elements, the more delayed will the crack initiation be.
- NOBUKI TOORU; OKUZUMI YUKI; HATATE MINORU; TAKENAKA HIROYASU日本機械学会論文集(Web) The Japan Society of Mechanical Engineers 81 (821) 14-00411(J-STAGE) - 00411-14-00411 2187-9761 2015 [Refereed]
This study aims to synthesize the bio-carbon with electro conductive properties by using graphitization catalyst synthesize from the woody carbon. In order to obtain the new functional bio-carbon, we prepared two initial powders. The two powdered samples (<Ⅰ>,<Ⅱ>) of cypress with different micro-structure were used for carbonization at 550~850°C and Fe-catalyzed carbonization at 850°C. The samples <Ⅰ> was prepared by pulverization of cypress chips with a wet cutter mill, which retained a micro-structure of coniferous wood . The sample <Ⅱ> was prepared by crushing the solid substance after drying the woody paste obtained by grinding the samples <Ⅰ> with a wet disk mill into ultra finely cellulose- fibrils. The carbon yield in carbonization and specific surface area were measured and XRD analysis was carried out for the carbonized products (chars) of both samples. The carbon yield for the sample <Ⅱ> was higher, and the specific surface area of the chars was considerably low compared with those for the samples <Ⅰ> and the chars. In Fe-catalyzed carbonization, it was confirmed that loaded Fe catalyst reacted with carbon atoms to form quantitatively Fe3C during carbonization and the crystallite size of char increased with increasing of amount of Fe loading up to 5 wt.%, but no definite difference in crystal structure between the chars of sample<Ⅰ> and <Ⅱ> was found. Fe3C contained in char could be easily removed by acid treatment. Specific surface area measured for the removed chars of sample <Ⅱ> was considerably high compared with that of carbonization without use of catalyst. - NOBUKI TOORU; HATATE MINORU; KARASUDANI TAKESHI; KARASUDANI TAKESHI; MIYAMOTO YUTAKA; HAMASAKA NAOJI; KANO SHIN'YA鋳造工学 Japan Foundry Engineering Society 86 (9) 719 - 727 1342-0429 2014/09 [Refereed]
The aim of the present work is to study the influence of copper content on impact characteristics and mechanical properties of ductile cast irons. Five melts with different chemical compositions from 0 (i.e. FCD) to 2mass% of copper content were produced using a high frequency induction furnace. The melt was poured into a Y-block CO2 sand mould of 32mm in thickness.
The chemical compositions of the samples are similar to each other in terms of Carbon (3.66mass%) and Silicon (2.52mass%), and the graphite nodularity is about 86% in all samples.
In as-cast samples, the tensile strength (UTS), elongation, and Brinell hardness, of non-additive element samples (i.e. FCD) were 480MPa, 19.5%, and 157HBW, respectively. The Charpy impact value at room temperature (R.T.) of smooth samples was 95.2J/cm2.
The strength depends on the Cu contents, and showed the highest value of 958MPa for UTS, and the minimum value of 6.3% for elongation. However, the impact value of the sample containing 2mass% Cu was 25.8J/cm2 at R. T. The impact transition temperature also tends to increase toward R. T. with increasing Copper contents. In order to improve toughness of cast irons for samples containing 1% Cu (named Cu1.0) and 2% Cu (named Cu2.0), normalization heat treatment was carried out in which the treatment temperature is decided based on the thermal expansion measurement results.
As a result, the area fraction of pearlite in the Cu1.0 and Cu2.0 samples was found to decrease by heat treatment at 1073K. For Cu2.0 samples treated at 1173K, UTS was 951MPa and elongation was 9.5%. The fracture energy at R. T. of these samples was 70J/cm2.
- Improvement of nitriding characteristics of ductile cast iron by an addition of alloying elementsY. Kawasaki; J. Sumioka; M. Hatate; T. Nobuki; N. Hamasaka; Y. Yamaguchi71st World Foundry Congress: Advanced Sustainable Foundry, WFC 2014 World Foundry Organization 2014This study aims to improve of characteristics of ductile cast iron by nitriding treatment on additive elements such as Molybdenum, Chromium, Vanadium and Alminium. At first, we produced seven kinds of ductile cast irons that six materials had added allying elements. The nitrided layer that formed on the surface of samples without alloying elements is about 0.01 mm in thickness, and the effective hardened depth and the micro-Vickers hardness at 0.03 mm depth from surface is 0.148 mm and 594HV. In the nitrided samples the fatigue lives in the higher stress range from 500 to 650MPa are longer in the order of adding elements. However, the samples are not recognized to be significant difference among the nitrided samples. Thus, it is suggesting that the deeper the hardened depth and/or the higher hardness in the vicinity of surface by addition of alloying elements is the later the generation of fatigue crack. Copyright 2014 World Foundry Organization.
- Tohru Nobuki; Shohei Kanekawa; Minoru Hatate; Hiroyasu Takenaka; Toshiro KujiJOURNAL OF ALLOYS AND COMPOUNDS ELSEVIER SCIENCE SA 580 (Supplement 1) S259 - S263 0925-8388 2013/12 [Refereed]
We carried out the spark plasma sintering (SPS) heat treatment method for Mg17Al12 phase in order to synthesize of mixture powder prepared with shorter MA time. The average particle size can be estimated around 20 mu m after 8 h of MA in argon atmosphere observed by SEM images. And the mixture prepared by 8 h of MA shows amorphous phase by X-ray diffraction (XRD) measurements. However, the obtained bulk form mixture shows Mg17Al12 structure after 30 min of SPS heat treatment at 673 K. And the powder characteristic of synthesized alloy shows nano-crystalline and remarkably low level of contamination measured by XRD analysis and EDX analysis. Moreover, the heat treated mixtures could absorb hydrogen rapidly without heat activation treatment measured by high pressure hydrogen differential scanning calorimeter (DSC) apparatus. This result suggests that the SPS heat treatment after short term MA is proved to be an efficient and simple expedient to synthesize hydrogen absorbing Mg-based alloys. (C) 2013 Elsevier B.V. All rights reserved. - Accurancy Improving Methods in Estimation of Graphite Nodularity of Ductile Cast iron by Measurement of Ultrasonic Velocity旗手 稔; 信木 関; 小松 眞一郎Science And Technology of Cassting Processes Intech 265 - 283 2012/12 [Refereed]
- ENDO EIJI; HATATE MINORU; NOBUKI TOORU; NAKAYAMA HIDEKI鋳造工学 日本鋳造工学会 83 (2) 86 - 92 1342-0429 2011/02 [Refereed]
Alloy tool steel castings, whose chemical compositions are 1.5% C and 12% Cr, have good wear resistance owing to continuous crystallization of M7C3 type Cr carbides. However, the continuity of these carbides reduces the strength of the castings in comparison with that of alloy tool steels which have the same hardness.
This study aims to determine the optimum C and Cr contents for dispersing continuous Cr carbides and develop castings satisfying both good mechanical characteristics and good wear properties. The melts were adjusted varying the alloy composition between 0.5 and 1.5mass% C, and between 8 and 12mass% Cr in a high frequency induction furnace by investment casting. The amount of carbides was found to decrease with decreasing C and Cr contents. Cr carbides also dispersed in the matrix microstructure, and decreasing the C content increased mechanical properties such as tensile strength and bending strength. Especially, samples with 0.5% carbon content exhibited superior characteristics such as 1300MPa tensile strength and 2450MPa bending strength compared to other samples.
On the other hand, decreasing the C content was found to deteriorate wear properties greatly due to reduced area fraction of crystallized carbides in the matrix microstructure. Based on these experimental results, we prepared samples adding Ti to the base melt. The results revealed improvements in the mechanical properties and wear properties of these Ti-added samples due to the fine TiC type carbides which crystallized preferentially than Cr type carbides in the matrix microstructures. - Tohru Nobuki; Minoru Hatate; Toshio ShiotaSCIENCE AND PROCESSING OF CAST IRON IX TRANS TECH PUBLICATIONS LTD 457 392 - + 1013-9826 2011 [Refereed]
The object of this study is to find out and evaluate systematically how the basic factors such as graphite-shape, external notch and matrix-characteristic affect the impact and bending characteristics of cast irons. The Spheroidal Graphite (SG) and Compacted Vermicular graphite (CV) cast iron samples were prepared, and their matrixes were modified into ferritic, pearlitic and bainitic in order to make the various kinds of samples whose graphite-shape and matrix vary widely. From each sample we produced five kinds of Charpy-type specimens by adding five kinds of notches whose stress concentration factor (a) varied from 1.0 (un-notched) to 4.8. The Charpy impact value decreases greatly in the range of a from 1 to 2.3 but decreases slightly in the range of a larger than 2.3. No influence to the fracture energy in the range of a larger than 2.3. Increasing of a results in moderate elevation of transition temperature of Charpy impact value and the transition temperature of CV cast ion is lower than that of SG one. The impact value in brittle fracture region of the cast iron samples were recognized to be a little bit larger than that of cast steel sample, and it was considered to be caused by graphite which act as a kind of buffer effect against crack growth in brittle fracture. - Minoru Hatate; Tohru Nobuki; Shoji Kiguchi; Kazumichi ShimizuSCIENCE AND PROCESSING OF CAST IRON IX TRANS TECH PUBLICATIONS LTD 457 380 - + 1013-9826 2011 [Refereed]
Low thermal expansion ductile cast iron is expected to become a new structural material with high dimensional stability against temperature change. We tried to develop a new low thermal expansion ductile cast iron by means of adding C and Si to Superinver alloy. In this study we prepared four kinds of ductile cast irons whose Co contents vary from 0% to 12%, and investigated about the effects of Co content and solution-treatments on several main characteristics such as coefficient of thermal expansion and mechanical properties. The results obtained are as follows: With increase of Co content the amount of martensite increases but this martensite can be inverse-transformed to austenite totally or greatly by solution-treatment followed with water-quenching. In the case of Co content less than some 9% the ability of relatively larger plastic deformation can be expected in inverse-transformed austenite. - ENDO EIJI; HATATE MINORU; NOBUKI TOORU; NAKAYAMA HIDEKI鋳造工学 Japan Foundry Engineering Society 82 (8) 465 - 471 1342-0429 2010/08 [Refereed]
This study aims to research the development of high strengthened alloy tool steel (SKD11) castings with superior wear resistance. The mechanical properties of the steel castings are inferior to rolled steel with dispersed Cr carbides owing to Cr carbides with M7C3 type crystallized continuously in the matrix. Therefore, we examined the replacing of Cr carbides with MC carbide by means of adding carbide stabilizer elements such as V, Ti and Nb to standard composition of SKD11 castings. The steel casting, varying from 0.3mass% V to 5mass% V, 0.5mass% Ti to 4mass% Ti and 0.5mass% Nb to 5mass% Nb, were melted in a high frequency induction furnace.
We systematically investigated the influence of amount, morphology, and distribution of M7C3 and/or MC type carbide on tensile and bending strength and wear resistance. With increasing amount of carbide stabilizer elements M, MC type carbides increased by the replacement from M7C3 carbides in the microstructure and continuity of Cr carbide tended to disappear. With the addition of the elements M, grained TiC crystallized randomly and dispersed finely, rod or petaline NbC crystallized randomly and aggregated locally, and rod VC crystallized around Cr carbides. This replacement effect is remarkable in the order to V < Nb < Ti. The tensile and bending strength of steel casting with the addition of V or Nb does not increase remarkably while the strength of the steel castings with about 2mass% Ti tends to improve remarkably. The abrasive wear properties of the steel castings with MC type carbides also improved significantly. From the viewpoint of improving wear resistance, fine TiC crystallized at random are more effective than NbC or VC. We found that the mechanical and wear properties of high strengthened alloy tool castings were closely related to the morphology and amount of crystallized carbides in the matrix. - HONJO TAKAMITSU; NOBUKI TOORU; KUJI TOSHIRO粉体および粉末冶金 Japan Society of Powder and Powder Metallurgy 57 (1) 3 - 9 0532-8799 2010/01 [Refereed]
Carbon-metal composite materials are expected for application to the catalyst and the electromagnetic wave absorbers. In this study, carbon-metal composite materials synthesized by the ball-milling (BM) process. Elemental powder of the Carbon (purity 99.9 %) was used. In this study the SUS304 γ-austenite stainless steel was used for the container and the balls. The weight ratio of ball to powder was 120:1. BM was carried out for maximum 216 ks at a speed of 11.4 Hz and the BM system was water-cooled by high-power BM apparatus (NEV-MA8, Nissin-Giken, Japan). The samples prepared by BM were removed from the pot in a glove box under argon. Obtained samples were somewhat contaminated from ball or container of stainless steel due to heavy scraping action between ball and container. BM for 216 ks yielded metallic phase (SUS304) to transform to α'-martensite due to heavy strain given to the γ-austenite during ball milling as mentioned above. As the result, fine metallic grains with equivalent composition to SUS304, C70Fe20Cr6Ni3 were distributed in carbon. This composite material was fully magnetized to 10 Am2 kg-1 at the magnetic field of 2.0 MA m-1. - ENDO EIJI; HATATE MINORU; NOBUKI TOORU; NAKAYAMA HIDEKI鋳造工学 81 (9) 429 - 435 1342-0429 2009/09 [Refereed]
- Masatake Abe; Tohru Nobuki; Toshiro KujiKeikinzoku/Journal of Japan Institute of Light Metals 59 (2) 75 - 80 0451-5994 2009/02 [Refereed]
The crystallization behavior of the Mg-Al alloy (initial ratio Mg: Al=17: 12) prepared by ball-milling (BM) was studied by means of X-ray diffractometry (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In the case of a short BM time (18ks), we could prepare the mixture of nano-sized Mg and Al grains. And the post annealing of the mixtures at even T< 373K yielded formation of the fine and low strained Mg 17Al 12 phase. In fact, the DSC analysis showed that only the sample after 18ks of BM had a distinct exothermic peak at 373K, corresponding to the formation of the Mg 17Al 12 and consisted of the compound from nano Mg and Al grains. The samples prepared for longer BM (144ks) did not show equivalent the formation peak time. These samples were composed of nano-sized Mg 17Al 12 phase with heavy strained due to mechanical energy. In addition, the Mg 17Al 12 synthesized from the sample after 18ks of BM is superior in hydrogen properties to the sample after 144ks of BM. - J. -C. Crivello; T. Nobuki; T. KujiINTERNATIONAL JOURNAL OF HYDROGEN ENERGY PERGAMON-ELSEVIER SCIENCE LTD 34 (4) 1937 - 1943 0360-3199 2009/02 [Refereed]
In the context of energy carrier, storage of hydrogen is one of the key challenges for research today. The group of Mg-based hydrides stands as a promising candidate for competitive hydrogen storage with high reversible hydrogen capacity. The present studies report encouraging results for Mg-Al system with Nb(2)O(5) additive catalyst. Three nominal compositions [ (Mg(x)Al(100-x))-99 + (Nb(2)O(5))-1 mol.%], X = 100 (Mg), X = 39 (beta-Mg(2)Al(3)) and X = 70 (Mg + gamma-Mg(17)Al(12)) have been investigated for their hydrogen equilibrium pressure of absorption and desorption reactions, from 250 degrees C to 400 degrees C. Decomposition of initial Nb(2)O(5) phase was shown after long annealing of samples, with reduction into other oxides. Moreover, the hydrogenation of Mg-Al alloys leads to separate initial phase(s) through several stages with the formation of MgH(2) hydride and metallic Al-fcc as the final products. This behavior is clearly visible from multi-plateaux of pressure-composition isotherm curves. In the case of the X = 70 compound, the reaction was accomplished through three reversible transformation steps. The hydrogen weight capacity of 4.7 wt.% has been found at 250 degrees C under reproducible conditions. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved. - Tohru Nobuki; Jean-Claude Crivello; Toshiro KujiMATERIALS TRANSACTIONS JAPAN INST METALS 49 (11) 2679 - 2685 1345-9678 2008/11 [Refereed]
In this work, the Mg17Al12 phase was successfully synthesized by the Bulk Mechanical Alloying (BMA), based oil repeating compression and extrusion cycles in a metallic die. After 2000 cycles of compression and extrusion, nano-structural Mg17Al12 phase was obtained in molded bulk shape. X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray (SEM-EDX) and differential scanning calorimetry (DSC) analyses were carried out to determine the morphology, phase structure of BMA-ed samples. The qualitative and quantitative analysis of phase abundance, evolution of microstructure and distribution of particles size were studied. It was shown that the Mg17Al12 alloy is able to absorb a large amount of hydrogen, higher than 3 mass% of Hydrogen. [doi: 10.2320/matertrans.MRA2008155] - Takamitsu Honjo; Tohru Nobuki; Toshiro KujiJOURNAL OF THE JAPAN INSTITUTE OF METALS JAPAN INST METALS 72 (10) 780 - 784 0021-4876 2008/10 [Refereed]
Magnesium based alloys possess light-weight and high hydrogen absorption capacity so that they have been investigated extensively for several decades. Great attention also has recently been paid to graphite as a hydrogen absorber. In this study Mg-C alloys were prepared by ball milling and their hydrogenation properties were investigated. Powders were first mixed with a 1:1 molar ratio of Mg to graphite. Milling balls and a pot were made of SUS304. This process was performed with a vibration ball mill at the speed of 11.8 Hz under an Ar gas atmosphere for 60 hours. The prepared powders were handled in a glove box filled with an Ar gas. After ball milling, samples showed a new X-ray diffraction peak, which was either not a peak from Mg and/or graphite. An affinity for the powders with hydrogen was confirmed at 453 K and the 1.8 MPa hydrogen pressure. The total amount of absorbed hydrogen was estimated to be 2.0 wt% from the thermal desorption spectroscopy (TDS) spectrum. - T. Nobuki; M. Hatate; T. ShiotaINTERNATIONAL JOURNAL OF CAST METALS RESEARCH MANEY PUBLISHING 21 (1-4) 31 - 38 1364-0461 2008/08 [Refereed]
This study aims to clarify the influence of additive elements of Ni and Mn on tensile and impact properties of three kinds of spheroidal graphite cast irons (SG irons), which are as cast, annealed and austempered samples. Spheroidal graphite cast irons with Ni (0-4.5 mass-%) and Mn (0-0.5 mass-%) melted by a high frequency induction furnace and cast into a Y block CO2 mould with 30 mm in thickness. From the viewpoint of heat treatment, tensile strength and hardness of SG irons become larger in the order of ferritised<as cast<austempered ones. Matrix structures of SG irons, which are conducted to austempering treatment from alpha and gamma mixture range, consists of bainitic ferrite with high toughness. Austempered SG iron with 3% Ni in 0.1% Mn series is found to become higher tensile strength compound with elongation and toughness of 901 MPa, 17% and 915 kJ m(-2). - CRIVELLO Jean-Claude; NOBUKI Tohru; KATO Shunsuke; ABE Masatake; KUJI ToshiroJournal of Advanced Science Society of Advanced Science 19 (3) 88 - 96 0915-5651 2008/04 [Refereed]
In the present work, the Mg-Al system was studied towards hydrogen absorption properties.
Several MgxAl100-x compounds from X=47.5 to 70 by incremental step of 2.5 were prepared by ball-milling with post-annealing. Different experimental measurements were performed and are in mutual agreement with properties of existing phases. They show that deviation from the ideal composition of Mg17Al12 (X=58.62) leads to a decrease of the homogeneity. The single γ-phase range is extended at room temperature for initial 55≤X≤62.5 atomic % of Mg.
The hydrogenation properties have been investigated for two compounds at the nominal composition X=50 and X=58.6. The hydrogen absorption is presented at 350°C and shows a maximum hydrogen capacity of 3.5 and 3.7 wt% respectively. For these two compounds, the pressure-composition isotherm (PCT) curves show two absorption plateaux, with equilibriums around 10 bars which are higher than that of pure MgH2. The shape discontinuity corresponds to a transformation into a 2-step process as described in this work. After final desorption, the initial compounds are recovered, indicates that the reactions are reversible. - Tohru Nobuki; Toshiro KujiJOURNAL OF THE JAPAN INSTITUTE OF METALS JAPAN INST METALS 72 (3) 236 - 243 0021-4876 2008/03 [Refereed]
This study aims to discuss the morphology of TiAl alloys prepared by mechanical alloying (MA) techinique. The alloy composition varied from 45 to 75 at% of Ti with MA time from 0 to 60 hours under Ar atmoshere. The vial and the balls were stainless steel. From the SEM observation, the diameter of MA particle is becoming smaller with increasing MA time. The diameter of Ti50Al50 powder indicates a size of 15 pm after 40 hours of ball milling. From the XRD measurements, the microstructure of MA alloy indicates an amorphous structure in the case of 20 hours of MA. We tried to synthesis TiAl or Ti3Al intermetallic alloy phase by heat treatment. DSC measurements shows crystallization started around 600 degrees C for each alloy, Although we could not synthesis the single phase, from the TEM bright image observation, we have confirmed that the alloy is composed by nano-size particles more and less 10 nm of diameter of crystalline particles. - Jean-Claude Crivello; Tohru Nobuki; Toshiro KujiMATERIALS TRANSACTIONS JAPAN INST METALS 49 (3) 527 - 531 1345-9678 2008/03 [Refereed]
Copper and iron are immiscible elements according to the equilibrium phase diagram, but they can form metastable phases by mechanical alloying process. In this present work, mixtures of Cu-Fe powders in the range 0, 12, 25 and 40 atomic% of Fe have been prepared by ball milling. The analysis of alloyed samples shows a single phase described in the fcc-Cu structure, except for the 40%-Fe compound, which presents the additional bcc-Fe phase. The study of microstructure and magnetic properties under thermal treatments suggests a decomposition of the metastable phase with increasing temperature. In the Cu-richer domain, the fee cell parameter increases with increasing Fe content. This effect is explained from the fact that the ferrornagnetic Fe phase is dispersed in the form of nanosized particles in the paramagnetic Cu matrix, in agreement with previous reports. - Toshiro Kuji; Takamitsu Honjo; Masafumi Chiba; Tohru Nobuki; J. C. Crivelloe-Journal of Surface Science and Nanotechnology 6 15 - 16 1348-0391 2008/01 [Refereed]
New transparent and electric conductive material, Mg(OH)2-C, was prepared by the sputtering Mg and C, and post-reaction of the Mg-C film with moisture in the air. The prepared film was composed of Mg, C, O, and H, and the lattice symmetry was identified to be Mg(OH)2 structure (P-3m1) with slightly elongated c-axis compared with hexagonal Mg(OH)2. The transmittance of the visible ray was 90% in the average. The electric resistivity ofthe film was on the order of 10-1 Ωcm. © 2008 The Surface Science Society of Japan. - HONJO TAKAMITSU; CHIBA MASAFUMI; NOBUKI Tohru; KUJI TOSHIRO表面科学 The Surface Science Society of Japan 29 (9) 532-536 (J-STAGE) - 536 0388-5321 2008 [Refereed]
It is well known that transparent conductive materials are key materials for FPD (Flat Panel Display). A practical transparent conductive material is indium tin oxide (ITO) consisting of indium oxide and tin oxide. However, indium price has increased over the last several years because indium is a rare metal with 0.00001 of Clarke number. Therefore searching alternative transparent conductive materials rather than indium has been very active over the last decades. In this study, rf-magnetron sputtering method is used. Magnesium and graphite target are co-sputtered and Mg-C films were formed. Then, Mg-C film became transparent after being left in moistured air for 10−15 min. Transmittance of 90% in average in the range of wavelength of 380−1000nm. Resistivity of 10−1 Ωcm was observed. In this work it will be demonstrated that black Mg-C non-equilibrium films that became consequently were transparent with electric resistively after exposing in the air. - 久慈俊郎; 信木 関; J-C CRIVELLOThe Journal of fuel cell technology 燃料電池開発情報センター 7 (3) 101 - 105 1346-6623 2008/01 [Refereed]
- NOBUKI Tohru; KUJI ToshiroJournal of Advanced Science Society of Advanced Science 19 (1) 11 - 15 0915-5651 2007/11 [Refereed]
In this work it will be demonstrated that the excess energy created during mechanical alloying ( MA ) yielded alloying of couples with even possitive mixing enthalpy, As a result the new ternary CaMg2X ( X = V, Fe ) bcc alloy was successively synthesized by MA. It will be pointed out that the structural relation to the CaMg2 Laves phase with bcc-element was important issue to form the ternary bcc phase. In this work hydrogen solubility of the synthesized bcc alloy was determined in order to clarify the above issue on the structure and hydrogenation. - J.-C. Crivello; T. Nobuki; T. KujiINTERMETALLICS ELSEVIER SCI LTD 15 (11) 1432 - 1437 0966-9795 2007/11 [Refereed]
In the present work, the homogeneity range of the Mg-Al gamma-phase was studied by ball-milling with post-annealing. In order to estimate the limit of its domain range, several MgxAl(100-x) compounds from X = 47.5 to 70 by incremental steps of 2.5 were prepared. Different experimental measurements (XRD, SEM, EDX, DSC) were performed and are in mutual agreement with the properties of the existing phases. They show that deviation from the ideal composition of the intermetallic Mg17Al12 structure (X = 58.62) leads to a decrease of the homogeneity (morphological and chemical compositions). Rietveld refinements on XRD patterns show that the single gamma-phase range is extended at room temperature and is identified for 55 <= X <= 62.5 at.% of nominal Mg powder. (c) 2007 Elsevier Ltd. All rights reserved. - Tohru Nobuki; Toshiro KujiJOURNAL OF THE JAPAN INSTITUTE OF METALS JAPAN INST METALS 71 (10) 916 - 920 0021-4876 2007/10 [Refereed]
We have demonstrated in our previous report that the excess energy created during mechanical alloying (MA) yielded alloying of elemental couples with even negative mixing enthalpy and that a formation of new ternary bcc phase. It was noticed that a structural correlation exists between the Laves and bcc structures. The aim of this study is to synthesize CaMg2 based bcc alloys in relation to the Laves phase structure with additive bcc vanadium, and to clarify the above issue on the structure and hydrogenation properties. The parent materials used in this study were CaMg2 and metallic element powder. The MA was performed under Ar gas atmosphere and the rotation speed is 710 rpm. The weight ratio of powder to ball is 1 : 40. With increasing MA time, the lattice parameter of bcc alloy increases. After 60 hours of MA, single bcc phase was formed. The TEM observations show that the alloy made after 60 hours of MA was composed of nano-structured bcc grains without deviation from the nominal composition. The TDS was used to measure the hydride properties of the synthesized bcc alloys. The result showed that 3 mass% of hydrogen was absorbed. A new phase appeared after the desorption of hydrogen. The reason can be explained by electronegativity argument of alloy elements relative to hydrogen. This result could encourage us to have a chance of formation of new alloy phases during hydrogenation. - Tohru Nobuki; Masafumi Chiba; Toshiro KujiJOURNAL OF ALLOYS AND COMPOUNDS ELSEVIER SCIENCE SA 446 152 - 156 0925-8388 2007/10 [Refereed]
We have demonstrated in our previous reports that the excess energy created during mechanical alloying (MA) yielded alloying of couples with even positive mixing enthalpy for-ming new ternary bee phases. It was noticed that the important issue there was the structural correlation between the Laves and bcc structures. In this study, we successfully synthesized new ternary CaMg2X (X = V, Fe, Mo) bcc alloys from the viewpoint of the structure correlation between CaMg2 Laves and the bcc elements. It was found that the mechanical alloyed bcc phases were composed of nano-structured bcc grains and the synthesized alloys were able to absorb hydrogen. (C) 2007 Elsevier B.V. All rights reserved. - J. -C. Crivello; T. Nobuki; S. Kato; M. Abe; T. KujiJOURNAL OF ALLOYS AND COMPOUNDS ELSEVIER SCIENCE SA 446 157 - 161 0925-8388 2007/10 [Refereed]
In order to modulate the thermodynamic properties of the (Mg-Al)-H-2 system, the extended homogeneity range of the gamma-Mg17Al12] 12 intermetallic phase has been studied in Al-richer domain. In this paper, the two compounds at the nominal composition MgxAl100-x, X = 50 and 58.6 are presented. The samples were prepared by the bulk mechanical alloying (BMA) technique. This method was used because of its great advantages for industrial applications (reducing time process, solid preform, large scale production...). The structures and phase's homogeneity of alloying compounds were analyzed by several experimental measurements. The hydrogen absorption properties are presented at 350 degrees C. Samples X = 50 and 58.6 show a maximum hydrogen capacity of 3.5 and 3.7 wt%, respectively. For these two compounds, the pressure-composition isotherm (PCT) curves show two absorption plateaux, with equilibriums around 10 bar which are higher than that of pure MgH2. The shape discontinuity corresponds to the transformation Of gamma-Mg17Al12 to MgH2 and to the intermediate beta-Al3Mg2 phase, before the completed decomposition in MgH2 hydride and pure Al-fcc in a second step. After final desorption, the initial compounds are recovered, indicates that the reactions are reversible. These behaviors are confirmed by X-ray diffraction (XRD) patterns refined by the Rietveld method. (C) 2007 Elsevier B.V. All rights reserved. - Masafumi Chiba; Hideki Hotta; Tohru Nobuki; Atsushi Sotoma; Toshiro KujiJOURNAL OF MAGNETISM AND MAGNETIC MATERIALS ELSEVIER SCIENCE BV 316 (2) E454 - E457 0304-8853 2007/09 [Refereed]
The purpose of this work is to understand a behavior of the microstructural and the magnetic properties of magnesium and 3d- transition metal alloys with because of which there is a difficulty of alloying thus by the conventional method a positive value of mixing enthalpy. Magnesium and, iron or cobalt powders were successfully alloyed with a wide range of compositions by mechanical alloying and characterized as synthesized alloys. The obtained Mg-Fe alloys with a composition less than 25 at% Mg were in single phase BCC with expanded lattice parameter. The variation tendency in lattice parameter and the coercive force with Mg composition were opposite. The microstructure of Mg-Co powders implies that the alloy could be partially amorphized or they could form a nano-sized morphology as expected. (c) 2007 Elsevier B. V. All rights reserved. - Tohru Nobuki; Jean-Claude Crivello; Toshiro KujiJOURNAL OF THE JAPAN INSTITUTE OF METALS JAPAN INST METALS 71 (8) 592 - 597 0021-4876 2007/08 [Refereed]
In this work, the Mg17Al12 phase was successfully synthesized by the Bulk Mechanical Alloying (BMA) based on repeating compression and extrusion cycles in the metallic die. After 2000 cycles of compression and extrusion, nano-structural Mg17Al12 phase was obtained in bulk form. X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray (SEM-EDX) and differential scanning calorimetry (DSC) analyses were carried out for several mechanically milled powder mixtures. The qualitative and quantitative analysis of phase abundance, evolution of microstructure and distribution of particles size were studied. It was demonstrated that Mg17Al12 alloy is able to absorb a large amount of hydrogen, higher than 3 mass% of Hydrogen. - Takamitsu Honjo; Tohru Nobuki; Masafumi Chiba; Toshiro KujiJOURNAL OF THE JAPAN INSTITUTE OF METALS JAPAN INST METALS 71 (8) 603 - 607 0021-4876 2007/08 [Refereed]
Mg-based alloys possess light-weight and high hydrogen absorption capacity, so they have been investigated extensively for several decades. Also, attention has recently been paid to graphite as a hydrogen absorber. In this study Mg-C composites were prepared by ball milling and their hydrogenation properties were investigated. Powders were first mixed with a 1 : I molar ratio of Mg (99.9% purity) to graphite (99.9% purity), and then milled using ZrO2 balls in a ZrO2 pot for 60 hours. This process was performed in a vibration ball mill at the speed of 345 rpm under an Ar gas atmosphere. The powders prepared in this way were handled in a glove box filled with an Ar gas. From the XRD patterns, it was found that the peak corresponding to the Mg phase shifted slightly to lower diffraction angles, indicating that the lattice spacing of the Mg phase was expanded by alloying partially with C in the powders. On the other hand, graphite peaks were rather broadened. An affinity for the powders with hydrogen was confirmed from the absorption experiment at the temperature of 453 K and the hydrogen pressure of 1.8 MPa. The total amount of absorbed hydrogen was estimated to be 3.5 mass% from the TDS measurement. - NOBUKI TOORU; SHIOTA TOSHIO; HATATE MINORU鋳造工学 日本鋳造工学会 77 (9) 601 - 607 1342-0429 2005/09 [Refereed]
- NOBUKI TOORU; SHIOTA TOSHIO; HATATE MINORU鋳造工学 日本鋳造工学会 76 (7) 555 - 561 1342-0429 2004/07 [Refereed]
- Nobuki Tohru; Shiota Toshio; Hatate MinoruTHE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY Japan Foundry Engineering Society 75 (11) 749 - 756 1342-0429 2003 [Refereed]
This study aims to clarify the effects of external notch on the impact and bending characteristics of spheroidal graphite cast iron (FDI) and compacted vermicular graphite cast iron (FCV) whose matrix was fully-ferritized by annealing. From each sample we produced five kinds of Charpy-type specimens by adding five kinds of notches whose stress concentration factor (α) varied from 1 (un-notched) to 4.8. They were applied for instrumented Charpy impact testing at the temperature range between 98 K to 423 K and also for three-point-bend testing under a slow loading speed at room temperature.<br> The test results of the Charpy impact testing and bend testing showed that the absorbed energy decreases greatly in the range of α from 1 to 2.3 but decreases slightly in the range of α larger than 2.3 in both samples. The results of energy analysis showed that the decreasing tendency of the absorbed energy by adding notches is mainly caused by the decreasing tendency of crack-initiation energy. The degree of influence of the external notches on toughness was found to be larger in the case of FDI than in the case FCV, and also larger in impact testing than in bend testing.
MISC
- 京極, 秀樹; 旗手, 稔; 生田, 明彦; 池庄司, 敏孝; 信木, 関; 大森, 整 近畿大学次世代基盤技術研究所報告 (13) 23 -27 2022/12
- 鋳鉄のシャルピー衝撃試験について信木関; 旗手稔; 塩田俊雄 (公社)日本鋳造工学会・中国四国支部会報(こしき) 45- 57 -61 2022/09
- 厚肉フェライト基地球状黒鉛鋳鉄の衝撃特性と破壊靭性信木関; 旗手稔 鋳鉄の材質高度化とその技術ー鋳物第24委員会鋳鉄分科会研究報告ー(独)日本学術振興会 鋳物第 24 委員会 編 140 -149 2022/08
- 【研究室紹介】近畿大学工学部機械工学科 材料プロセス工学・材料物性工学研究室旗手稔; 信木関 鋳造工学 94- (7) 402 2022/07
- 青木, 隆謙; 旗手, 稔; 信木, 関 近畿大学工学部研究報告 = Research reports of the Faculty of Engineering, Kindai University 55- 1 -6 2022/02
- 鋳造と摩擦撹拌プロセスを組み合わせた肉盛方法生田明彦; 旗手稔; 信木関; Adrian Gerlich (公社)日本鋳造工学会・中国四国支部会報(こしき) 44- 69 -73 2021/12
- Impact Properties and Fracture Toughness of Heavy-section Spheroidal Graphite Cast IronsTohru NOBUKI; Minoru HATATE; Shohei YAMADA; Yutaka MIYAMOTO Proceedings of the 12th International Symposium on the Science and Processing of Cast Iron (SPCI-XII) 46 -47 2021/11
- 京極, 秀樹; 旗手, 稔; 生田, 明彦; 信木, 関; 池庄司, 敏孝; 大森, 整 近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University 12- 25 -30 2021/08
- 京極 秀樹; 旗手 稔; 生田 明彦; 池庄司 敏孝; 信木 関; 大森 整 近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University (11) 27 -32 2020/07
- 京極 秀樹; 旗手 稔; 生田 明彦; 池庄司 敏孝; 信木 関; 大森 整 近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University (10) 29 -34 2019/10
- 住谷 直人; 道廣 篤史; 崎野 良比呂; 松本 直幸; 猪瀬 幸太郎; 信木 関 日本建築学会中国支部研究報告集 日本建築学会中国支部 編 41- 225 -228 2018/03
- 中国四国支部の活動状況('2017)信木 関 鋳造工学 89- (9) 2017/09
- 生田明彦; 旗手稔; 信木関 材料とプロセス(CD-ROM) 30- (2) ROMBUNNO.198 2017/08
- 京極 秀樹; 旗手 稔; 生田 明彦; 池庄司 敏孝; 信木 関; 田上 将治; 大森 整; 米原 牧子 近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University 8- (8) 26 -32 2017/06
- 高山 大樹; 崎野 良比呂; 信木 関 日本建築学会中国支部研究報告集 (40) 193 -194 2017/03
- 道廣 篤史; 崎野 良比呂; 小野 泰寛; 信木 関; 松本 直樹; 瀬 幸太郎; 堤 成一郎 日本建築学会中国支部研究報告集 40- (40) 299 -302 2017/03
- 中国四国支部の活動状況('2016)信木関 88- (9) 2016/09
- 京極 秀樹; 旗手 稔; 生田 明彦; 池庄司 敏孝; 信木 関; 大森 整; 米原 牧子 近畿大学次世代基盤技術研究所報告 = Kindai University Research Institute of Fundamental Technology for Next Generation 7- (7) 27 -31 2016/07
- 日下賞を受賞して信木 関 日本鋳造工学会 中国四国支部会報 2015/12
- 京極 秀樹; 旗手 稔; 生田 明彦; 信木 関; 大森 整; 池庄司 敏孝; 米原 牧子 近畿大学次世代基盤技術研究所報告 = Kinki University Research Institute of Fundamental Technology for Next Generation 6- 27 -31 2015/06
- 信木 関; 旗手 稔; 京極 秀樹 近畿大学工学部研究報告 (49) 15 -23 2015
- 中国四国支部の活動状況信木 関 鋳造工学 2014/09
- 「WFC2014」に参加して信木 関 日本鋳造工学会 中国四国支部会報 2014/09
- 信木 関; 久慈 俊郎; 旗手 稔 近畿大学工学部研究報告 = Research reports of the Faculty of Engineering, Kinki University 47- (47) 19 -25 2013/12
- NOBUKI Tohru 鋳造工学 = Journal of Japan Foundry Engineering Society 85- (9) 633 -636 2013/09
- 信木 関 まてりあ : 日本金属学会会報 52- (9) 450 -450 2013/09
- Impact characteristics of copper alloyed ductile cast irons信木 関; 旗手 稔; 烏谷 豪; 宮本 諭卓 Reports of the 5th Japan-Korea workshop for young foundry engineers 57 -60 2013/09
- メカニカルアロイング法によるMg系水素吸蔵合金の創製信木 関; 旗手 稔; 竹中 啓恭; 東海大学工学部; 応用化学科 水素エネルギー協会大会論文 32- 93 -96 2012/12
- 中国四国支部の活動状況('2012)信木 関 84- (9) 2012/09
- 信木 関; 清水 一道 素形材 53- (8) 58 -61 2012/08
- Development of High Toughness Austempered Ductile Irons信木 関; 旗手 稔; 木口 昭二; 清水 一道 Proceedings of the 70th World Foundry Congress 100 -106 2012/04
- 信木 関; 清水 一道 素形材 53- (2) 67 -69 2012/02
- Microstructures and mechanocal properties of alloy tool steel castings with carbides stabilizer elements信木 関; 旗手 稔; 遠藤 栄治; 中山 英樹 Proceedings of the 11th Asian Foundry Congress 207 -213 2011/11
- Strength and Abrasion Characeristics of Alloy Tool Steel Castings Produced by Investent Casting Process遠藤栄治; 旗手 稔; 信木 関; 中山英樹 Proceedings of 69th World Foundry Congress 441 -445 2010/10
- ENDO EIJI; HATATE MINORU; NOBUKI TOORU; NAKAYAMA HIDEKI 近畿大学工学部研究報告 43- (43) 43 -53 2009/12
- NOBUKI TOORU; KUJI TOSHIRO; HATATE MINORU 近畿大学工学部研究報告 43- (43) 55 -60 2009/12
- Mechanical Characteristics of Spheroidal Graphite Cast Irons Containing Ni and Mn with Mixture of Ferrite and Bainitic-ferrite信木 関; 旗手 稔; 塩田 俊雄 Proc. 10th Asian Foundry Congress(AFC10) 168 -173 2008/05
- NOBUKI TOORU; SHIOTA TOSHIO; HATATE MINORU 近畿大学工学部研究報告 39- (39) 27 -33 2005/12
- NOBUKI Tohru; SHIOTA Toshio; HATATE Minoru Research reports of the Faculty of Engineering, Kinki University 38- (38) 35 -41 2004
- Impact and Bending Characteristics of Spheroidal Graphite Cast Iron with External Notch信木 関; 塩田 俊雄; 旗手 稔 Proc. 1st Korea-Japan Conference for YFE 1- 9 -12 2003/04
- Notch Effects on Impact Characteristics of Spheroidal and Compacted Vermicular Graphite Cast Irons with Various MatrixProceedings of the 8th Asian Foundry Congress 48 -57 2003
- 球状およびCV黒鉛鋳鉄の衝撃特性に及ぼす黒鉛の影響近畿大学工学部 研究報告 (37) 59 -67 2003
- 信木 関; 塩田 俊雄; 旗手 稔 近畿大学工学部 研究報告 (36) 37 -44 2002
Books and other publications
Lectures, oral presentations, etc.
- 厚肉球状黒鉛鋳鉄の引張、衝撃及び疲労特性に関する肉厚感受性渥美黎; 旗手稔; 信木関; 山本賢(一社)日本機械学会 M&M2023/M&P2023(つくば) 2023/09
- Impact Properties and Fracture Toughness of Heavy-section Spheroidal Graphite Cast irons [Not invited]Tohru NOBUKI, Minoru HATATE, Shohei YAMADA and Yutaka MIYAMOTOThe 12th International Symposium on the Science and Processing of Cast Iron (SPCI-XII) 2021/11 Muroran, Hokkaido, JAPAN
- 厚肉フェライト基地球状黒鉛鋳鉄の衝撃特性と破壊靱性 [Invited]信木 関; 旗手 稔; 山田翔平; 宮本諭卓(公社)日本鋳造工学会 第178回全国講演大会(論文賞受賞記念講演) 2021/11 室蘭(オンライン)
- 高 Si 系球状黒鉛鋳鉄の機械的性質に及ぼす Mn, S及び熱処理の効果青木隆謙; 旗手稔; 信木関(公社)日本鋳造工学会 第 6 回鋳鉄研究部会(オンライン) 2021/09
- 鋳鉄のシャルピー衝撃試験について信木関; 旗手稔(公社)日本鋳造工学会・中国四国支部・第48回研究部会(オンライン) 2021/07
- メカニカルミリングとSPS処理によるTi系合金の創製と水素吸収特性信木関; 旗手稔(一社)日本機械学会・中国四国支部 第59期総会・講演会(オンライン:No.03a3) 2021/03
- 厚肉フェライト基地球状黒鉛鋳鉄の衝撃特性と破壊靭性信木関; 旗手稔(独)日本学術振興会・鋳物第 24 委員会「鋳鉄分科会」第 114 回会議(オンライン) 2021/02
- 厚肉フェライト基地球状黒鉛鋳鉄の衝撃特性信木関; 旗手稔(公社)日本鋳造工学会 第4回・鋳鉄研究部会(オンライン) 2021/02
- 金属積層造形によるハイエントロピー合金の造形条件の探索とその機械的特性池田峻史; 京極秀樹; 旗手稔; 信木関(公社)日本鋳造工学会中国四国支部 第47回研究部会 2020/07
- Magnesium based hydrogen storage alloys prepared by mechanical alloying with copper or aluminium additive [Not invited]NOBUKI TohruWHTC2019 2019/06
- メカニカルアロイングによるTi-Ni系合金の創製と水素吸収特性 [Not invited]信木 関; 旗手稔; Fermin CUEVAS; Jean-Claude CRIVELLO; Jean-Marc JOUBERT日本機械学会中国四国支部第57期講演会(宇部) 2019/03
- メカニカルミリングおよびSPS熱処理を用いたTi系水素吸蔵合金の創製 [Not invited]信木 関; 森谷太郎; 旗手稔; Fermin CUEVAS; Jean-Claude CRIVELLO; Jean-Marc JOUBERT日本金属学会中国四国支部・若手フォーラム 2018/12
- Synthesis of Titanium Based Alloy Prepared by Mechanical Milling and SPS Method [Not invited]NOBUKI TohruJournées Nationales sur le Frittage par Courant Pulsé (SPS2017), Villetaneuse, France 2017/10
- メカニカルミリングとSPS熱処理を用いたTi‐Fe系合金の創製と水素化特性 [Not invited]森谷太郎; 信木関; 旗手稔日本鉄鋼協会中国四国支部・日本金属学会中国四国支部講演大会講演概要集 2017/08
- 600mm立方体に鋳造した球状黒鉛鋳鉄の実体衝撃特性 [Not invited]山田翔平; 旗手稔; 信木関; 宮本諭卓日本鋳造工学会全国講演大会講演概要集 2017/05
- メカニカルミリングとSPS熱処理によるTi‐Fe系合金の創製 [Not invited]森谷太郎; 信木関; 旗手稔; 南波克哉; 高田隆矢日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2017/02
- メカニカルミリングとその後熱処理を利用したTi‐Fe系合金の創製 [Not invited]信木関; 森谷太郎; 旗手稔日本鉄鋼協会中国四国支部・日本金属学会中国四国支部講演大会講演概要集 2016/08
- 繰り返し塑性加工を行ったマグネシウム系合金の開発信木関; 旗手稔(公社)日本鋳造工学会 中国四国支部第41回研究部会(広島) 2016/07
- Effects of nitriding and nitro-carburizing on the fatigue properties of ductile cast ironTohru NOBUKI; Yusuke KAWASAKI; Minoru HATATE; Akihiko IKUTA; Naoji HAMASAKAThe 72nd World Foundry Congress (WFC2016), Nagoya 2016/05
- 合金添加鋳鉄および鋳鋼の組織機械的性質,衝撃特性 [Not invited]NOBUKI Tohru日本鋳造工学会全国講演大会講演概要集 2015/05
- 合金添加球状黒鉛鋳鉄の機械的性質および衝撃特性信木関; 旗手稔(独)日本学術振興会 鋳物第24委員会 鋳鉄分科会第102回会議(No.364)(東京) 2015/04
- OKUZUMI Yuki; NOBUKI Tohru; HATATE Minoru; TAKENAKA Hiroyasu講演論文集 2015/02
- Improvement of Impact Characterisitcs of Pearlitic Ductile Cast IronsTohru NOBUKI; Minoru HATATE(公社)日本鋳造工学会 第165回全国講演大会(北九州)(5th Japan-Korea Co-Session, Kita-Kyusyu) 2014/10
- オーステンパ球状黒鉛鋳鉄切削時の切削抵抗 [Not invited]IKUTA AKIHIKO; HATATE MINORU; NOBUKI SEKI日本鋳造工学会全国講演大会講演概要集 2014/10
- 75mm厚球状黒鉛鋳鉄の引張および衝撃特性に及ぼすC量およびSi量の影響 [Not invited]KAWASAKI YUSUKE; HATATE MINORU; NOBUKI SEKI日本鋳造工学会全国講演大会講演概要集 2014/10
- 銅を添加した球状黒鉛鋳鉄の機械的性質と衝撃特性信木関; 旗手稔(公社)日本鋳造工学会 第10回鋳鉄・レアアースレス高性能鋳鉄合同研究部会(東京) 2014/07
- Improvement of Nitriding Characteristics of Ductile Cast Iron by an Addition of Alloying ElementsYuki KAWASAKI; Junichi SUMIOKA; MInoru HATATE; Tohru NOBUKI; Naoji HAMASAKAThe 71st World Foundry Congress(Bilbao, SPAIN) 2014/05
- Impact Characteristics and Mechanical Properties of Copper Alloyed Spheroidal Graphite Cast IronsTohru NOBUKI; MInoru HATATE; Takeshi KARASUDANIThe 71st World Foundry Congress(Bilbao, SPAIN) 2014/05
- メカニカルミリングを利用したMg系合金の創製と水素親和性 [Not invited]NOBUKI TOORU; OKUZUMI TOMOKI; UEMOTO KEIGO; HATATE MINORU; TAKENAKA HIROYASU日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2014/02
- 窒化処理した高強度球状黒鉛鋳鉄の疲労強度特性 [Not invited]HATATE MINORU; NOBUKI SEKI; KAWASAKI YUSUKE; HAMASAKA NAOJI日本鋳造工学会全国講演大会講演概要集 2013/10
- Mechanical propeties of alloy tool steel castings [Not invited]信木 関; 旗手 稔; 遠藤 栄治; 花房 龍男The 5th Japan-Korea workshop for Young Foundry Engineers(YFE, Muroran) 2013/09 Muroran, Hokkaido The 5th Japan-Korea workshop for Young Foundry Engineers(YFE)
- Influence of alloying elements on fatigue properties of nitrided ductile cast irons [Not invited]旗手 稔; 信木 関; 河崎 裕介; 隅岡 純一; 奥隅 友規; 浜坂 直治The 5th Japan-Korea workshop for Young Foundry Engineers(YFE) 2013/09 Muroran, Hokkaido The 5th Japan-Korea workshop for Young Foundry Engineers(YFE)
- Impact characteristics of copper alloyed ductile cast irons [Not invited]信木 関; 旗手 稔; 烏谷 豪; 宮本 諭卓The 5th Japan-Korea workshop for Young Foundry Engineers(YFE, Muroran) 2013/09 Muroran, Hokkaido The 5th Japan-Korea workshop for Young Foundry Engineers(YFE)
- メカニカルアロイング法によるMg系水素吸蔵合金の創製 [Not invited]信木 関; 旗手 稔; 竹中 啓恭; 東海大学工学部; 応用化学科(一社)水素エネルギー協会 第32回(HESS)大会 2012/12 広島 (一社)水素エネルギー協会 第32回(HESS)大会
- オーステンパ球状黒鉛鋳鉄の切削性におよぼす鋳造方法の影響 [Not invited]IKUTA AKIHIKO; HATATE MINORU; NOBUKI SEKI; KYOGOKU HIDEKI日本鋳造工学会全国講演大会講演概要集 2012/10 盛岡 日本鋳造工学会第154回全国講演大会
- Development of Mg based Hydrogen Absorbing Alloys Prepared by Mechanical Alloying [Not invited]信木 関; 旗手 稔; 竹中 啓恭International Symposium on Metal-Hydrogen Syatems(MH2012) 2012/10 Kyoto International Symposium on Metal-Hydrogen Syatems(MH2012)
- 球状黒鉛鋳鉄の衝撃特性に及ぼすCu添加と熱処理の影響 [Not invited]信木 関; 旗手 稔日本鋳造工学会中国四国支部第34回いいもの研究部会 2012/08 広島市工業技術センター(広島市) 日本鋳造工学会中国四国支部第34回いいもの研究部会
- 球状黒鉛鋳鉄の衝撃特性に及ぼすCu添加と熱処理の効果 [Not invited]NOBUKI SEKI; HATATE MINORU; KARASUYA TAKESHI; MIYAMOTO YUTAKU日本鋳造工学会全国講演大会講演概要集 2012/05 名古屋市中小企業振興会館(名古屋) 日本鋳造工学会 第160回全国講演大会
- Development of High Toughness Austempered Ductile Irons [Not invited]信木 関; 旗手 稔; 木口 昭二; 清水 一道The 70th World Foundry Congress(Monterrey, MEXICO) 2012/04 Monterrey, MEXICO The 70th World Foundry Congress
- メカニカルアロイング法を用いたMg‐Al,Ti‐Fe系合金創製とその水素親和性 [Not invited]KANEKAWA SHOHEI; HATATE MINORU; NOBUKI TOORU日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2012/02
- 高強度球状黒鉛鋳鉄の衝撃特性に及ぼすNi,Cuの影響 [Not invited]烏谷 豪; 旗手 稔; 信木 関; 宮本 論卓; 浜坂 直治; 加納 慎也日本鋳造工学会 第159回全国講演大会 2011/11 島根県立産業交流会館(松江) 日本鋳造工学会 第159回全国講演大会
- Microstructures and mechanical properties of alloy tool steel castings with carbides stabilizer elements [Not invited]信木 関; 旗手 稔; 遠藤 栄治; 中山 英樹The 11th Asian Foundry Congress 2011/11 Guangzhou, CHINA The 11th Asian Foundry Congress
- 高強度球状黒鉛鋳鉄の衝撃特性に及ぼすNi,Cuの影響 [Not invited]KARASUYA TAKESHI; HATATE MINORU; NOBUKI SEKI; MIYAMOTO TSUGUTAKU; HAMASAKA NAOJI; KANO SHIN'YA日本鋳造工学会全国講演大会講演概要集 2011/10
- 低熱膨張球状黒鉛鋳鉄の熱膨張特性と熱処理条件との関係 [Not invited]TAKIMOTO HIROKI; HATATE MINORU; NOBUKI SEKI日本鋳造工学会全国講演大会講演概要集 2011/10 島根県立産業交流会館(松江) 日本鋳造工学会 第159回全国講演大会
- 粉末冶金法を用いたMg系合金の創製 [Not invited]KANEKAWA SHOHEI; NOBUKI TOORU; HATATE MINORU日本鉄鋼協会中国四国支部・日本金属学会中国四国支部講演大会講演概要集 2011/08 岡山理科大学(岡山市) 日本鉄鋼協会第54回・日本金属学会第51回中国四国支部講演大会
- Notch Effects on Impact and Bending Characteristics of Spheroidal and Compacted Vermicular Graphite Cast Irons with Various Matrices [Not invited]信木 関; 旗手 稔; 塩田 俊雄9th International Symposium on SCIENCE and Processing of Cast Iorn (SPCI'9) 2010/11 Luxor, Egypt 9th International Symposium on SCIENCE and Processing of Cast Iorn (SPCI'9)
- Mechanical Properties and Thermal Expansion Characteristics of Low Thermal Expansion Ductile Cast Iron with Same Nikel Equivalent(NiE) [Not invited]旗手 稔; 信木 関; 木口 昭二; 清水一道9th International Symposium on SCIENCE and Processing of Cast Iorn (SPCI'9) 2010/11 Luxor, Egypt 9th International Symposium on SCIENCE and Processing of Cast Iorn (SPCI'9)
- Strength and Abrasion Characeristics of Alloy Tool Steel Castings Produced by Investent Casting Process [Not invited]遠藤栄治; 旗手 稔; 信木 関; 中山英樹The 69th World Foundry Congress 2010/10 Hangzhou, CHINA The 69th World Foundry Congress
- 高強度化した高C,Cr鋳鋼の機械的性質および耐摩耗性 [Not invited]NOBUKI SEKI; ENDO HIDEHARU; HATATE MINORU; YASUNARI YUKI日本鋳造工学会全国講演大会講演概要集 2010/05
- 高強度球状黒鉛鋳鉄の衝撃特性に及ぼすCuの影響 [Not invited]宮本諭卓; 旗手 稔; 信木 関; 加納慎也; 山口泰文; 為井大輔(社)日本鋳造工学会 中国四国支部 支部研究発表会 2009/12 広島 (社)日本鋳造工学会 中国四国支部 支部研究発表会
- 耐熱性球状黒鉛鋳鉄の高温強度と耐酸化性評価 [Not invited]兵景; 旗手 稔; 信木 関; 笠原康正(社)日本鋳造工学会 中国四国支部 支部研究発表会 2009/12 広島 (社)日本鋳造工学会 中国四国支部 支部研究発表会
- 炭素/ステンレス系合金複合材料の磁気特性 [Not invited]HONJO TAKAMITSU; KANO TAKUYA; NOBUKI TOORU; KUJI TOSHIRO粉体粉末冶金協会講演概要集 2009/10
- High Strengthened alloy tool steel castings by addition of carbide stabilizing elements [Not invited]遠藤栄治; 旗手 稔; 信木 関; 中山英樹The 3rd Japan-Korea Workshop for Young Foundry Engineers 2009/10 Nagasaki, Japan The 3rd Japan-Korea Workshop for Young Foundry Engineers
- ボールミリング処理により作製した炭素複合材料の磁気特性 [Not invited]HONJO TAKAMITSU; NOBUKI TOORU; KUJI TOSHIRO日本金属学会講演概要 2009/09
- MAによるMg系水素吸蔵合金の創製とその特性 [Not invited]信木 関(社)日本機械学会 機械材料・材料加工部門 粉体・粉末成形技術研究分科会 2009/08 東広島 (社)日本機械学会 機械材料・材料加工部門 粉体・粉末成形技術研究分科会
- ボールミル法により合成した炭素複合材料の磁性特性 [Not invited]HONJO TAKAMITSU; NOBUKI TOORU; KUJI TOSHIRO粉体粉末冶金協会講演概要集 2009/06 京都 粉体粉末冶金協会 平成21年度春季大会
- 炭化物生成元素添加による高炭素・高クロム鋳鋼の強度の改善 [Not invited]ENDO HIDEHARU; NAKAYAMA HIDEKI; HATATE MINORU; NOBUKI TOORU日本鋳造工学会全国講演大会講演概要集 2009/05 東京 日本鋳造工学会第154回全国講演大会
- 機械的性質および組織を考慮した材料との比較におけるADI材料の切削特性 [Not invited]IKUTA AKIHIKO; HATATE MINORU; FUKAYA YASUHIRO; KYOGOKU HIDEKI; NOBUKI TOORU日本鋳造工学会全国講演大会講演概要集 2009/05 東京 日本鋳造工学会第154回全国講演大会
- インバー組成のNi当量とした低熱膨張鋳鉄の性質に及ぼすニッケルとコバルトの影響 [Not invited]HATATE MINORU; NOBUKI TOORU; SHIOTA TOSHIO日本鋳造工学会全国講演大会講演概要集 2009/05 東京 日本鋳造工学会第154回全国講演大会
- ADI材料の被削性が工具寿命におよぼす影響 [Not invited]生田 明彦; 旗手 稔; 深谷 保博; 京極 秀樹; 信木 関日本鋳造工学会平成20年度中国四国支部研究発表会 2008/12 広島 日本鋳造工学会平成20年度中国四国支部研究発表会
- ADI材料と他材料との切削現象の比較 [Not invited]生田 明彦; 旗手 稔; 深谷 保博; 京極 秀樹; 信木 関精密工学会第67回難削材加工専門委員会 2008/11 広島 精密工学会第67回難削材加工専門委員会
- ボールミリングで作製したナノ構造MgAl合金の結晶化挙動とその水素吸収特性 [Not invited]ABE MASATAKE; NOBUKI TOORU; KUJI TOSHIRO軽金属学会大会講演概要 2008/10
- 精密鋳造した高炭素・高クロム鋳鋼の諸性質に及ぼすバナジウムの影響 [Not invited]ENDO EIJI; NAKAYAMA HIDEKI; KISHU MINORU; NOBUKI SEKI日本鋳造工学会全国講演大会講演概要集 2008/10 金沢 日本鋳造工学会153回全国講演大会
- ADI材料における切削特性の定量化 [Not invited]IKUTA AKIHIKO; KISHU MINORU; FUKAYA YASUHIRO; KYOGOKU HIDEKI; NOBUKI SEKI日本鋳造工学会全国講演大会講演概要集 2008/10 金沢 日本鋳造工学会第153回全国講演大会
- 24%Ni‐12%Co低熱膨張球状黒鉛鋳鉄のマルテンサイト変態に関する臨界冷却速度 [Not invited]KISHU MINORU; NOBUKI SEKI; SHIOTA TOSHIO日本鋳造工学会全国講演大会講演概要集 2008/10 金沢 日本鋳造工学会153回全国講演大会
- MAによるMg‐Al系水素吸蔵合金の創製とその特性 [Not invited]NOBUKI TOORU; CRIVELLO JEAN-CLAUDE; KUJI TOSHIRO; HATATE MINORU日本金属学会講演概要 2008/09 熊本 日本金属学会2008年度秋期(第143回)大会
- Mechanical Characteristics of Spheroidal Graphite Cast Irons Containing Ni and Mn with Mixture of Ferrite and Bainitic-ferrite [Not invited]信木 関; 旗手 稔; 塩田 俊雄The 10th Asian Foundry Congress, (AFC-10), 2008/05 Nagoya, Japan The 10th Asian Foundry Congress, (AFC-10),
- ボールミリングによる新規Mg‐C相の創製とその水素親和性 [Not invited]HONJO TAKAMITSU; NOBUKI TOORU; KUJI TOSHIRO日本金属学会講演概要 2008/03
- 新規Mg(OH)2‐C透明導電材料の創製(I)―合成と基本的特性― [Not invited]HONJO TAKAMITSU; CHIBA MASASHI; NOBUKI TOORU; CRIVELLO J.-C; KUJI TOSHIRO日本金属学会講演概要 2008/03
- 新規Mg(OH)2‐C透明導電材料の創製(II)―膜の微細構造評価― [Not invited]HONJO TAKAMITSU; CHIBA MASASHI; NOBUKI TOORU; CRIVELLO J.-C; KUJI TOSHIRO日本金属学会講演概要 2008/03
- スパッタ法を用いたMg基透明導電膜の合成と特性評価 [Not invited]HONJO TAKAMITSU; CHIBA MASASHI; NOBUKI TOORU; KUJI TOSHIRO表面科学講演大会講演要旨集 2007/11 東京 日本表面科学第27回講演大会
透明な導電性薄膜に関する研究は、Inを母相とする酸化物材料を中心に盛んに行われている。本研究は、ITOに替わる新規材料の探索的合成を主眼として行うものであり、RFマグネトロンスパッタ法を用いて、マグネシウムを母相とする透明導電性薄膜の合成を試みた。作製した薄膜について電気特性、光学特性ならびに微細構造について、4端子法、分光光度計ならびにXRD、EPMA、XPS、SEMなどを用いて評価を行った。 - メカニカルアロイングによるCaMg‐C系合金の創製とその組織形態 [Not invited]NOBUKI TOORU; HONJO TAKAMITSU; KUJI TOSHIRO軽金属学会大会講演概要 2007/10
- 高圧水素中でボールミリングしたMgAl合金の水素放出特性 [Not invited]ABE MASATAKE; CRIVELLO J.-C; NOBUKI SEKI; KUJI TOSHIRO日本金属学会講演概要 2007/09 岐阜 日本金属学会2007年度秋期(第141回)大会
- 水素雰囲気下でボールミリング処理したMg/C複合材料の水素放出特性 [Not invited]HONJO TAKAMITSU; NOBUKI KAN; CHIBA MASASHI; KUJI TOSHIRO日本金属学会講演概要 2007/09 岐阜 日本金属学会2007年度秋期(第141回)大会
- メカニカルアロイングによるTiFe合金の合成過程と試料回収量の関係 [Not invited]ABE MASATAKE; NOBUKI SEKI; KUJI TOSHIRO日本金属学会講演概要 2007/09 岐阜 日本金属学会2007年度秋期(第141回)大会
- TiAl合金の創製とその組織形態 [Not invited]NOBUKI SEKI; CRIVELLO JEAN-CLAUDE; ABE MASATAKE; KUJI TOSHIRO日本金属学会講演概要 2007/09 岐阜 日本金属学会2007年度秋期(第141回)大会
- MgAl合金の創製とその水素吸蔵特性 [Not invited]NOBUKI SEKI; CRIVELLO JEAN-CLAUDE; KUJI TOSHIRO日本金属学会講演概要 2007/03
- ボールミリングによるMg/Cの複合化とその水素吸蔵特性 [Not invited]HONJO TAKAMITSU; NOBUKI TOORU; CHIBA MASASHI; KUJI TOSHIRO応用物理学関係連合講演会講演予稿集 2007/03 相模原 応用物理学会第54回(2007年春季)応用物理学関係連合講演会
- LaAl系合金の創製とその水素親和性 [Not invited]NOBUKI SEKI; KUJI TOSHIRO日本金属学会講演概要 2007/03 千葉 日本金属学会2007年度春期(第140回)大会
- 繰返し塑性加工法によるMgxAl100-x(x=40~60)水素吸蔵合金の創製 [Not invited]信木 関; J-C CRIVELLO; 久慈俊郎日本機械学会第14回機械材料・材料加工技術講演会(M&P2006) 2006/11 千葉 日本機械学会第14回機械材料・材料加工技術講演会(M&P2006)
- Synthesis of Laves Phase Related bcc Alloy and their Hydogenation [Not invited]信木 関Society of Advanced Science(SAS) Workshop on the Advanced Metal-Hydrogen Systems 2006/10 Hiratsuka, Japan Society of Advanced Science(SAS) Workshop on the Advanced Metal-Hydrogen Systems
- Synthesis of CaMg-based bcc Alloys and their Hydrogenation Properties [Not invited]信木 関; 久慈俊郎International Symposium on Metal-Hydrogen Systems (MH2006) 2006/10 Hawaii, USA International Symposium on Metal-Hydrogen Systems (MH2006)
- Study of the Extended Domain Range in Mg17Al12 Intermetallic Phase and their Hydrogen Storage Properties [Not invited]J-C CRIVELLO; 信木 関; 阿部真丈; 加藤俊介; 久慈俊郎International Symposium on Metal-Hydrogen Systems (MH2006) 2006/10 Hawaii, USA International Symposium on Metal-Hydrogen Systems (MH2006)
- ボールミリングと熱処理によるMg17Al12合金の合成とその水素吸蔵特性 [Not invited]ABE MASATAKE; CRIVELLO J.-C; SHINOKI KAN; KUJI TOSHIRO日本金属学会講演概要 2006/09
- MAによるMgC合金の創製と水素吸蔵特性 [Not invited]HONJO TAKAMITSU; SHINOGI KAN; KUJI TOSHIRO日本金属学会講演概要 2006/09 新潟 日本金属学会2006年度秋期(第139回)大会
- MGを行ったCaMg2合金の水素化特性 [Not invited]信木 関; 久慈俊郎日本金属学会2006年度秋期(第139回)大会 2006/09 新潟 日本金属学会2006年度秋期(第139回)大会
- BMAによるMg‐Al合金の創製とその水素吸蔵特性 [Not invited]NOBUKI TOORU; CRIVELLO JEAN-CLAUDE; KUJI TOSHIRO軽金属学会大会講演概要 2006/04
- MA法を用いて作製したCo‐Mg系粒子の微細構造評価と磁気特性 [Not invited]SOTOMA ATSUSHI; CHIBA MASASHI; HOTTA HIDEKI; NOBUKI KAN; KUJI TOSHIRO応用物理学関係連合講演会講演予稿集 2006/03
- CaMg系bcc合金の創製とその水素吸蔵特性 [Not invited]NOBUKI KAN; KUJI TOSHIRO日本金属学会講演概要 2006/03 東京 日本金属学会2006年度春期(第138回)大会
- Chiba Masafumi; Hotta Hideki; Nobuki Tohru; Kuji ToshiroAbstract of annual meeting of the Surface Science of Japan 2006Mgを含むA2B合金は水素吸蔵合金として注目されている.母相としてFe(bcc)とCo(hcp)を選択し,Mg(hcp)を添加することによって得られる2元系合金微粒子の作製を試みた.しかし混合エンタルピ(ΔHmix)が正であるため,一般的な作製手法では単相を得にくい.そこでΔHmixの符号に左右されない合金作製法として有望な機械的合金法を適用した.得られた粉末の構造や特性を種々評価した.
- NOBUKI Tohru; HOTTA Hideki; KUJI Toshiro大会講演概要 2005/10
- MAによるCaMgV bcc合金の創製と水素吸蔵特性 [Not invited]信木 関; 堀田英樹; 久慈俊郎日本金属学会2005年度秋期(第137回)大会 2005/09 広島 日本金属学会2005年度秋期(第137回)大会
- 球状黒鉛鋳鉄の切欠・衝撃曲げ特性に関する研究 [Not invited]信木 関日本鋳造工学会 平成17年度支部講演会 2005/06 広島 日本鋳造工学会 平成17年度支部講演会
- Ni添加球状黒鉛鋳鉄の機械的性質と衝撃特性 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会146回全国講演大会 2005/05 東京 日本鋳造工学会146回全国講演大会
- 球状黒鉛鋳鉄の切欠・衝撃特性に関する研究 [Not invited]平成17年度日本鋳造工学会中四国支部講演会講演概要集 2005
- 球状黒鉛鋳鉄の衝撃特性に及ぼす基地組織の影響 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会中国四国支部研究発表会 2004/12 広島 日本鋳造工学会中国四国支部研究発表会
- 球状黒鉛鋳鉄とSi鋳鋼の破面解析 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会145回全国講演大会 2004/10 北九州 日本鋳造工学会145回全国講演大会
- 球状黒鉛鋳鉄の靭性特性に及ぼす荷重速度の影響 [Not invited]信木 関; 旗手 稔; 塩田 俊雄日本鋳造工学会144回全国講演大会 2004/05 名古屋 日本鋳造工学会144回全国講演大会
- Notch Effects on Impact Characteristics of Spheroidal and Compacted Vermicular Graphite Cast Irons with Various Matrix [Not invited]信木 関; 塩田 俊雄; 旗手 稔; 小松 眞一郎The 8th Asian Foundry Congress,(AFC-8) 2003/10 Bangkok, Thailand The 8th Asian Foundry Congress,(AFC-8)
- Si鋳鋼の衝撃および曲げ特性 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会142回全国講演大会 2003/05 東京 日本鋳造工学会142回全国講演大会
- Impact and Bending Characteristics of Spheroidal Graphite Cast Iron with External Notch [Not invited]信木 関; 塩田 俊雄; 旗手 稔The 1st Korea-Japan Conference for YFE 2003/04 Jeju, Korea The 1st Korea-Japan Conference for YFE
- 球状及びCV黒鉛鋳鉄の衝撃特性に及ぼす切欠き効果 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会中国四国支部研究発表会 2002/12 広島 日本鋳造工学会中国四国支部研究発表会
- CV黒鉛鋳鉄の衝撃及び曲げ特性 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会141回全国講演大会 2002/10 山形 日本鋳造工学会141回全国講演大会
- 黒鉛形状の異なるオーステンパ処理鋳鉄の切欠き衝撃及び曲げ特性 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会140回全国講演大会 2002/05 大阪 日本鋳造工学会140回全国講演大会
- 黒鉛形状の異なるベイナイト地鋳鉄の衝撃及び曲げ特性 [Not invited]日本機械学会第32回中四国支部研究発表会講演概要集 2002
- 黒鉛形状の異なるパーライト地鋳鉄の衝撃及び曲げ特性に及ぼす外部切欠きの影響 [Not invited]信木 関; 塩田 俊雄; 旗手 稔日本鋳造工学会138回全国講演大会 2001/05 千葉 日本鋳造工学会138回全国講演大会
- 黒鉛形状の異なる鋳鉄の衝撃及び曲げ特性に及ぼす外部切欠きの影響 [Not invited]NOBUKI KAN; SHIOTA TOSHIO; HATATE MINORU日本鋳造工学会全国講演大会講演概要集 2000/09
- SHIODA TOSHIO; HATADE MINORU; NOBUKI KAN日本鋳造工学会全国講演大会講演概要集 1999/10
- ダイヤモンドビットの穿孔性能に及ぼすダイヤモンド集中度の影響 [Not invited]日本機械学会第29回中四国支部研究発表会 講演概要集 1999
Research Themes
- 厚肉球状黒鉛鋳鉄の実体品強度評価(衝撃特性)(公社)日本鋳造工学会 鋳鉄研究部会:Date (from‐to) : 2022/04
- メカニカルミリングとマイクロ波加熱を用いた水素吸蔵合金の創製(公財)古川技術研究財団:研究助成Date (from‐to) : 2020/06 -2021/03
- ミリング処理とその後塑性加工熱処理を利用した新規合金創製法の開発東広島市:大学連携政策課題共同研究事業Date (from‐to) : 2020/06 -2021/03
- 籾殻由来の触媒を添加したアルカリ金属系水素吸蔵合金の開発(公財)サタケ技術振興財団:研究助成Date (from‐to) : 2016/06 -2017/03
- 合金添加鋳鉄の計装化シャルピー衝撃試験特性と破壊靭性特性に関する研究(公社)日本鋳造工学会:特別若手研究奨励Date (from‐to) : 2016/05 -2017/03
- 銅添加した球状黒鉛鋳鉄の衝撃特性(公社)日本鋳造工学会:若手研究活動支援Date (from‐to) : 2014/10
- 高強度・高靭性鋳鉄の開発に関する研究(公社)日本鋳造工学会:若手研究奨励Date (from‐to) : 2009/05 -2010/03
- メカニカルアロイングを用いた高強度・高延性焼結材料の開発近畿大学:奨励研究助成Date (from‐to) : 2009/05 -2010/03