信木 関 (ノブキ トオル)

  • 工学部 機械工学科 教授
Last Updated :2024/02/01

コミュニケーション情報 byコメンテータガイド

  • コメント

    金属材料(おもに鉄鋼、鋳鉄)の強度、疲労特性といった機械的性質、衝撃特性についての研究、および機械材料の創製プロセス、高機能化、水素吸蔵合金などの新規機能性付与の分野についての研究。

研究者情報

学位

  • 修士(工学)(近畿大学)
  • 博士(工学)(近畿大学)

ホームページURL

J-Global ID

研究キーワード

  • 新機能材料   破面解析   破壊靭性   衝撃破壊   fracture toughness   impact fracture   

現在の研究分野(キーワード)

    金属材料(おもに鉄鋼、鋳鉄)の強度、疲労特性といった機械的性質、衝撃特性についての研究、および機械材料の創製プロセス、高機能化、水素吸蔵合金などの新規機能性付与の分野についての研究。

研究分野

  • ナノテク・材料 / 構造材料、機能材料
  • ものづくり技術(機械・電気電子・化学工学) / 材料力学、機械材料

経歴

  • 2008年 - 現在  近畿大学工学部Faculty of Engineering
  • 2017年09月 - 2018年08月  -フランス国立科学研究センター(CNRS)・パリ東材料化学研究所(ICMPE)・招聘研究員Institut de Chimie et des Matériaux de Paris Est, ICMPE
  • 2007年09月 - 2008年03月  -東海大学工学部非常勤講師(兼務)
  • 2005年 - 2008年  -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年 - 2008年  東海大学特定研究員
  • 2004年 - 2005年  -近畿大学研究員(兼任)
  • 2004年 - 2005年  近畿大学非常勤講師

学歴

  •         - 2004年   近畿大学   工学系研究科   システム設計工学
  •         - 2001年   近畿大学   工業技術   生産システム
  •         - 1999年   近畿大学   工学部   機械

所属学協会

  • 軽金属学会   日本金属学会   日本鋳造工学会   日本機械学会   

研究活動情報

論文

  • 青木 隆謙; 旗手 稔; 信木 関
    鋳造工学 94 10 606 - 613 公益社団法人 日本鋳造工学会 2022年10月 [査読有り]
     
    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.
  • 旗手 稔; 青木 隆謙; 信木 関
    鋳造工学 93 12 809 - 815 公益社団法人 日本鋳造工学会 2021年12月 [査読有り]
     
    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 93 8 470 - 476 日本鋳造工学会 2021年08月 [査読有り]
  • Takafumi Ikeda; Makiko Yonehara; Toshi-Taka Ikeshoji; Tohru Nobuki; Minoru Hatate; Kosuke Kuwabara; Yasuhiko Otsubo; Hideki Kyogoku
    CRYSTALS 11 5 2021年05月 [査読有り]
     
    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.
  • 信木関; 旗手稔; 山田翔平; 宮本諭卓
    鋳造工学 92 10 529 - 536 公益社団法人 日本鋳造工学会 2020年10月 [査読有り]
     

      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-Marc
    International Journal of Hydrogen Energy 44 21 10770‐10776 - 10776 2019年 [査読有り]
     
    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-Marc
    Materials Transactions 60 3 441‐449(J‐STAGE) - 449 2019年 [査読有り]
     
    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 Joubert
    Metals 8 4 1 - 11 2018年04月 [査読有り]
     
    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.
  • 崎野 良比呂; 松本 直幸; 猪瀬 幸太郎; 信木 関; 堤 成一郎
    鋼構造論文集 25 99 99_23 - 99_30 社団法人 日本鋼構造協会 2018年 [査読有り]
     

    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.

  • Tohru NOBUKI; Minoru HATATE; Toshio SHIOTA
    Materials Sciences and Applications 8 13 948 - 958 2017年12月 [査読有り]
  • Tohru Nobuki; Minoru Hatate; Akihiko Ikuta; Yusuke Kawasaki; Naoji Hamasaka
    INTERNATIONAL JOURNAL OF METALCASTING 11 1 52 - 60 2017年01月 [査読有り]
     
    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 irons
    Tohru NOBUKI; Minoru HATATE; Takeshi KARASUDANI; Yuki OKUZUMI
    Foundry Trade Journal 190 3740 294 - 298 2016年12月 [査読有り]
  • 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 88 5 276 - 281 日本鋳造工学会 2016年05月 [査読有り]
     

      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 88 1 37 - 42 公益社団法人 日本鋳造工学会 2016年01月 [査読有り]
     

      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 Nobuki
    MATERIALS TRANSACTIONS 57 8 1339 - 1344 2016年 [査読有り]
     
    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 Nobuki
    MATERIALS TRANSACTIONS 57 9 1575 - 1580 2016年 [査読有り]
     
    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.
  • 旗手稔; 信木関; 生田明彦; 浜坂直治; 河崎裕介
    鋳造工学 87 6 382 - 387 公益社団法人 日本鋳造工学会 2015年06月 [査読有り]
     

      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.

  • 生田明彦; 旗手稔; 信木関
    鋳造工学 87 4 231 - 238 公益社団法人 日本鋳造工学会 2015年04月 [査読有り]
     

      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.

  • 河崎裕介; 隅岡純一; 旗手稔; 信木関; 浜坂直治; 山口泰文
    鋳造工学 87 1 3 - 8 公益社団法人 日本鋳造工学会 2015年01月 [査読有り]
     

      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.

  • 信木関; 奥隅友規; 旗手稔; 竹中啓恭
    日本機械学会論文集(Web) 81 821 14-00411(J-STAGE) - 00411-14-00411 The Japan Society of Mechanical Engineers 2015年 [査読有り]
     
    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.
  • 信木関; 旗手稔; 烏谷豪; 烏谷豪; 宮本諭卓; 浜坂直治; 加納慎也
    鋳造工学 86 9 719 - 727 公益社団法人 日本鋳造工学会 2014年09月 [査読有り]
     

      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.

  • Tohru Nobuki; Shohei Kanekawa; Minoru Hatate; Hiroyasu Takenaka; Toshiro Kuji
    JOURNAL OF ALLOYS AND COMPOUNDS 580 Supplement 1 S259 - S263 2013年12月 [査読有り]
     
    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 265 - 283 Intech 2012年12月 [査読有り]
  • 旗手 稔; 信木 関; 遠藤 栄治; 中山 英樹
    鋳造工学 83 2 86 - 92 日本鋳造工学会 2011年02月 [査読有り]
     
    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 Shiota
    SCIENCE AND PROCESSING OF CAST IRON IX 457 392 - + 2011年 [査読有り]
     
    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 Shimizu
    SCIENCE AND PROCESSING OF CAST IRON IX 457 380 - + 2011年 [査読有り]
     
    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.
  • 遠藤栄治; 旗手稔; 信木関; 中山英樹
    鋳造工学 82 8 465 - 471 Japan Foundry Engineering Society 2010年08月 [査読有り]
     
    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.
  • 本城貴充; 信木 関; 久慈俊郎
    粉体および粉末冶金 57 1 3 - 9 Japan Society of Powder and Powder Metallurgy 2010年01月 [査読有り]
     
    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.
  • 遠藤栄治; 旗手 稔; 信木 関; 中山英樹
    鋳造工学 81 9 429 - 435 2009年09月 [査読有り]
  • 阿部真丈; 信木関; 久慈俊郎
    軽金属 59 2 75 - 80 2009年02月 [査読有り]
     
    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. Kuji
    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 34 4 1937 - 1943 2009年02月 [査読有り]
     
    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 Kuji
    MATERIALS TRANSACTIONS 49 11 2679 - 2685 2008年11月 [査読有り]
     
    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]
  • 本城貴充; 信木 関; 久慈俊郎
    日本金属学会誌 72 10 780 - 784 2008年10月 [査読有り]
     
    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. Shiota
    INTERNATIONAL JOURNAL OF CAST METALS RESEARCH 21 1-4 31 - 38 2008年08月 [査読有り]
     
    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).
  • J-C CRIVELLO; 信木 関; 加藤俊介; 阿部真丈; 久慈俊郎
    Journal of Advanced Science 19 3 88 - 96 Society of Advanced Science 2008年04月 [査読有り]
     
    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.
  • 信木 関; 久慈俊郎
    日本金属学会誌 72 3 236 - 243 2008年03月 [査読有り]
     
    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 Kuji
    MATERIALS TRANSACTIONS 49 3 527 - 531 2008年03月 [査読有り]
     
    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. Crivello
    e-Journal of Surface Science and Nanotechnology 6 15 - 16 2008年01月 [査読有り]
     
    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.
  • 本城貴充; 千葉雅史; 信木関; 久慈俊郎
    表面科学 29 9 532-536 (J-STAGE) - 536 The Surface Science Society of Japan 2008年 [査読有り]
     
    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 CRIVELLO
    燃料電池 7 3 101 - 105 燃料電池開発情報センター 2008年01月 [査読有り]
  • 信木 関; 久慈俊郎
    Journal of Advanced Science 19 1 11 - 15 Society of Advanced Science 2007年11月 [査読有り]
     
    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; 信木 関; Toshiro KUJI
    Intermetallics 15 11 1432 - 1437 2007年11月 [査読有り]
     
    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.
  • 信木 関; 久慈俊郎
    日本金属学会誌 71 10 916 - 920 2007年10月 [査読有り]
     
    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 Kuji
    JOURNAL OF ALLOYS AND COMPOUNDS 446 152 - 156 2007年10月 [査読有り]
     
    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; 信木 関; S. KATO; M. ABE; Toshiro KUJI
    Journal of Alloys and Compounds 446 157 - 161 2007年10月 [査読有り]
     
    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 Kuji
    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 316 2 E454 - E457 2007年09月 [査読有り]
     
    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.
  • 信木関; CRIVELLO Jean-claude; 久慈俊郎
    日本金属学会誌 71 8 592 - 597 2007年08月 [査読有り]
     
    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.
  • 本城貴充; 信木関; 千葉雅史; 久慈俊郎
    日本金属学会誌 71 8 603 - 607 2007年08月 [査読有り]
     
    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.
  • 信木 関; 塩田 俊雄; 旗手 稔
    鋳造工学 77 9 601 - 607 日本鋳造工学会 2005年09月 [査読有り]
  • 信木関; 塩田俊雄; 旗手稔
    鋳造工学 76 7 555 - 561 日本鋳造工学会 2004年07月 [査読有り]
  • 信木 関; 塩田 俊雄; 旗手 稔
    鋳造工学 75 11 749 - 756 Japan Foundry Engineering Society 2003年 [査読有り]
     
    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.

書籍

  • 鋳造カレッジ テキスト
    信木 関 (担当:範囲:鋳鉄の材質)(一社)日本鋳造協会 2017年07月
  • 鉄鋼便覧 第5版
    信木 関 (担当:分担執筆範囲:第3巻 材料の組織と特性 2.6節)(一社)日本鉄鋼協会 2014年08月
  • 新版 鋳鉄の材質 (第3章3節)
    旗手 稔; 信木 関 (担当:共著範囲:)(公社)日本鋳造工学会 2012年12月

講演・口頭発表等

  • 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年09月 口頭発表(一般)
  • 青木 隆謙; 旗手 稔; 信木 関
    鋳造工学 全国講演大会講演概要集 2023年 公益社団法人 日本鋳造工学会
  • Impact Properties and Fracture Toughness of Heavy-section Spheroidal Graphite Cast irons  [通常講演]
    Tohru NOBUKI, Minoru HATATE, Shohei YAMADA and Yutaka MIYAMOTO
    The 12th International Symposium on the Science and Processing of Cast Iron (SPCI-XII) 2021年11月 口頭発表(一般) 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  [招待講演]
    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年11月 口頭発表(招待・特別) 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年09月
  • 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年07月
  • 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年03月
  • 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年02月
  • 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年02月
  • 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年07月
  • 生田 明彦; Gerlich Adrian; 旗手 稔; 信木 関
    鋳造工学 全国講演大会講演概要集 2020年 公益社団法人 日本鋳造工学会
  • 生田 明彦; Gerlich Adrian; 旗手 稔; 信木 関
    鋳造工学 全国講演大会講演概要集 2020年 公益社団法人 日本鋳造工学会
  • Magnesium based hydrogen storage alloys prepared by mechanical alloying with copper or aluminium additive  [通常講演]
    Tohru NOBUKI; Minoru HATATE; Fermin CUEVAS; Jean-Claude CRIVELLO; Jean-Marc JOUBERT
    World Hydrogen Technologies Convention(WHTC2019, Tokyo) 2019年06月
  • 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  [通常講演]
    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年03月 口頭発表(一般)
  • 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  [通常講演]
    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年12月
  • Synthesis of Titanium Based Alloy Prepared by Mechanical Milling and SPS Method  [通常講演]
    Tohru NOBUKI; Taro MORIYA; Minoru HATATE; Jean-Claude CRIVELLO; Fermin CUEVAS; Jean-Marc JOUBERT
    Journées Nationales sur le Frittage par Courant Pulsé (SPS2017), Villetaneuse, France 2017年10月 ポスター発表
  • 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年08月
  • 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年05月
  • 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)(広島工大) 2017年02月
  • 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(島根大学・松江キャンパス) 2016年08月
  • 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年07月
  • Effects of nitriding and nitro-carburizing on the fatigue properties of ductile cast iron
    Tohru NOBUKI; Yusuke KAWASAKI; Minoru HATATE; Akihiko IKUTA; Naoji HAMASAKA
    The 72nd World Foundry Congress (WFC2016), Nagoya 2016年05月
  • 信木関
    日本鋳造工学会全国講演大会講演概要集(早稲田大学) 2015年05月
  • 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年04月
  • 奥隅 友規; 信木 関; 旗手 稔; 竹中 啓恭
    講演論文集(No.214) 2015年02月
  • Improvement of Impact Characterisitcs of Pearlitic Ductile Cast Irons
    Tohru 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年10月
  • 生田明彦; 旗手稔; 信木関
    日本鋳造工学会全国講演大会講演概要集 2014年10月
  • 河崎裕介; 旗手稔; 信木関
    日本鋳造工学会全国講演大会講演概要集 2014年10月
  • 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年07月
  • Improvement of Nitriding Characteristics of Ductile Cast Iron by an Addition of Alloying Elements
    Yuki KAWASAKI; Junichi SUMIOKA; MInoru HATATE; Tohru NOBUKI; Naoji HAMASAKA
    The 71st World Foundry Congress(Bilbao, SPAIN) 2014年05月
  • Impact Characteristics and Mechanical Properties of Copper Alloyed Spheroidal Graphite Cast Irons
    Tohru NOBUKI; MInoru HATATE; Takeshi KARASUDANI
    The 71st World Foundry Congress(Bilbao, SPAIN) 2014年05月
  • 信木関; 奥隅友規; 上本啓伍; 旗手稔; 竹中啓恭
    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年02月
  • 旗手稔; 信木関; 河崎裕介; 浜坂直治
    日本鋳造工学会全国講演大会講演概要集 2013年10月
  • Mechanical propeties of alloy tool steel castings  [通常講演]
    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年09月 Muroran, Hokkaido The 5th Japan-Korea workshop for Young Foundry Engineers(YFE)
  • Influence of alloying elements on fatigue properties of nitrided ductile cast irons  [通常講演]
    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年09月 Muroran, Hokkaido The 5th Japan-Korea workshop for Young Foundry Engineers(YFE)
  • Impact characteristics of copper alloyed ductile cast irons  [通常講演]
    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年09月 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  [通常講演]
    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年12月 広島 (一社)水素エネルギー協会 第32回(HESS)大会
  • 生田 明彦; 旗手 稔; 信木 関; 京極 秀樹
    日本鋳造工学会第154回全国講演大会 2012年10月 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  [通常講演]
    信木 関; 旗手 稔; 竹中 啓恭
    International Symposium on Metal-Hydrogen Syatems(MH2012) 2012年10月 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  [通常講演]
    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年08月 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
  • 信木 関; 旗手 稔; 烏谷 豪; 宮本 論卓
    日本鋳造工学会 第160回全国講演大会 2012年05月 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  [通常講演]
    信木 関; 旗手 稔; 木口 昭二; 清水 一道
    The 70th World Foundry Congress(Monterrey, MEXICO) 2012年04月 Monterrey, MEXICO The 70th World Foundry Congress
  • 金川昌平; 旗手稔; 信木関
    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年02月
  • 高強度球状黒鉛鋳鉄の衝撃特性に及ぼすNi,Cuの影響  [通常講演]
    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年11月 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  [通常講演]
    信木 関; 旗手 稔; 遠藤 栄治; 中山 英樹
    The 11th Asian Foundry Congress 2011年11月 Guangzhou, CHINA The 11th Asian Foundry Congress
  • 烏谷豪; 旗手稔; 信木関; 宮本諭卓; 浜坂直治; 加納真也
    日本鋳造工学会全国講演大会講演概要集 2011年10月
  • 滝元 弘樹; 旗手 稔; 信木 関
    日本鋳造工学会 第159回全国講演大会 2011年10月 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
  • 金川 昌平; 信木 関; 旗手 稔
    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 2011年08月 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  [通常講演]
    信木 関; 旗手 稔; 塩田 俊雄
    9th International Symposium on SCIENCE and Processing of Cast Iorn (SPCI'9) 2010年11月 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)  [通常講演]
    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年11月 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  [通常講演]
    遠藤栄治; 旗手 稔; 信木 関; 中山英樹
    The 69th World Foundry Congress 2010年10月 Hangzhou, CHINA The 69th World Foundry Congress
  • 信木関; 遠藤栄治; 旗手稔; 安成祐貴
    日本鋳造工学会全国講演大会講演概要集 2010年05月
  • 信木 関; 遠藤 栄治; 旗手 稔; 安成 祐貴
    鋳造工学 全国講演大会講演概要集 2010年 公益社団法人 日本鋳造工学会
  • 高強度球状黒鉛鋳鉄の衝撃特性に及ぼすCuの影響  [通常講演]
    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年12月 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  [通常講演]
    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年12月 広島 (社)日本鋳造工学会 中国四国支部 支部研究発表会
  • 本城貴充; 狩野拓也; 信木関; 久慈俊郎
    粉体粉末冶金協会講演概要集 2009年10月
  • High Strengthened alloy tool steel castings by addition of carbide stabilizing elements  [通常講演]
    遠藤栄治; 旗手 稔; 信木 関; 中山英樹
    The 3rd Japan-Korea Workshop for Young Foundry Engineers 2009年10月 Nagasaki, Japan The 3rd Japan-Korea Workshop for Young Foundry Engineers
  • 本城貴充; 信木関; 久慈俊郎
    日本金属学会講演概要 2009年09月
  • MAによるMg系水素吸蔵合金の創製とその特性  [通常講演]
    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年08月 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
  • 本城貴充; 信木 関; 久慈俊郎
    粉体粉末冶金協会 平成21年度春季大会 2009年06月 京都 粉体粉末冶金協会 平成21年度春季大会
  • 遠藤栄治; 旗手 稔; 信木 関; 中山英樹
    日本鋳造工学会第154回全国講演大会 2009年05月 東京 日本鋳造工学会第154回全国講演大会
  • 生田 明彦; 旗手 稔; 京極 秀樹; 信木 関; 深谷 保博
    日本鋳造工学会第154回全国講演大会 2009年05月 東京 日本鋳造工学会第154回全国講演大会
  • 旗手 稔; 信木 関; 塩田 俊雄
    日本鋳造工学会第154回全国講演大会 2009年05月 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  [通常講演]
    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年12月 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  [通常講演]
    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年11月 広島 精密工学会第67回難削材加工専門委員会
  • 阿部真丈; 信木関; 久慈俊郎
    軽金属学会大会講演概要 2008年10月
  • 遠藤栄治; 信木 関; 中山英樹
    日本鋳造工学会153回全国講演大会 2008年10月 金沢 日本鋳造工学会153回全国講演大会
  • 生田 明彦; 旗手 稔; 深谷 保博; 京極 秀樹; 信木 関
    日本鋳造工学会第153回全国講演大会 2008年10月 金沢 日本鋳造工学会第153回全国講演大会
  • 旗手 稔; 信木 関; 塩田 俊雄
    日本鋳造工学会153回全国講演大会 2008年10月 金沢 日本鋳造工学会153回全国講演大会
  • 信木 関; J-C CRIVELLO; 久慈俊郎
    日本金属学会2008年度秋期(第143回)大会 2008年09月 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  [通常講演]
    信木 関; 旗手 稔; 塩田 俊雄
    The 10th Asian Foundry Congress, (AFC-10), 2008年05月 Nagoya, Japan The 10th Asian Foundry Congress, (AFC-10),
  • 本城貴充; 信木関; 久慈俊郎
    日本金属学会講演概要 2008年03月
  • 本城貴充; 千葉雅史; 信木関; CRIVELLO J.‐C; 久慈俊郎
    日本金属学会講演概要 2008年03月
  • 本城貴充; 千葉雅史; 信木関; CRIVELLO J.‐C; 久慈俊郎
    日本金属学会講演概要 2008年03月
  • 千葉雅史; 信木 関; 本城貴充; 久慈俊郎
    日本表面科学第27回講演大会 2007年11月 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。
  • 信木関; 本城貴充; 久慈俊郎
    軽金属学会大会講演概要 2007年10月
  • 阿部真丈; 信木 関; J-C CRIVELLO; 久慈俊郎
    日本金属学会2007年度秋期(第141回)大会 2007年09月 岐阜 日本金属学会2007年度秋期(第141回)大会
  • 本城貴充; 信木 関; 千葉雅史; 久慈俊郎
    日本金属学会2007年度秋期(第141回)大会 2007年09月 岐阜 日本金属学会2007年度秋期(第141回)大会
  • 阿部真丈; 信木 関; 久慈俊郎
    日本金属学会2007年度秋期(第141回)大会 2007年09月 岐阜 日本金属学会2007年度秋期(第141回)大会
  • 信木 関; J-C CRIVELLO; 阿部真丈; 久慈俊郎
    日本金属学会2007年度秋期(第141回)大会 2007年09月 岐阜 日本金属学会2007年度秋期(第141回)大会
  • 信木関; CRIVELLO Jean‐Claude; 久慈俊郎
    日本金属学会講演概要 2007年03月
  • 本城貴充; 信木 関; 千葉雅史; 久慈俊郎
    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 2007年03月 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
  • 信木 関; 久慈俊郎
    日本金属学会2007年度春期(第140回)大会 2007年03月 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  [通常講演]
    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年11月 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  [通常講演]
    信木 関
    Society of Advanced Science(SAS) Workshop on the Advanced Metal-Hydrogen Systems 2006年10月 Hiratsuka, Japan Society of Advanced Science(SAS) Workshop on the Advanced Metal-Hydrogen Systems
  • Synthesis of CaMg-based bcc Alloys and their Hydrogenation Properties  [通常講演]
    信木 関; 久慈俊郎
    International Symposium on Metal-Hydrogen Systems (MH2006) 2006年10月 Hawaii, USA International Symposium on Metal-Hydrogen Systems (MH2006)
  • Study of the Extended Domain Range in Mg17Al12 Intermetallic Phase and their Hydrogen Storage Properties  [通常講演]
    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年10月 Hawaii, USA International Symposium on Metal-Hydrogen Systems (MH2006)
  • 阿部真丈; CRIVELLO J.‐C; 信木関; 久慈俊郎
    日本金属学会講演概要 2006年09月
  • 本城貴充; 信木 関; 久慈俊郎
    日本金属学会2006年度秋期(第139回)大会 2006年09月 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  [通常講演]
    信木 関; 久慈俊郎
    日本金属学会2006年度秋期(第139回)大会 2006年09月 新潟 日本金属学会2006年度秋期(第139回)大会
  • 信木関; CRIVELLO Jean‐Claude; 久慈俊郎
    軽金属学会大会講演概要 2006年04月
  • 外間淳; 千葉雅史; 堀田英樹; 信木関; 久慈俊郎
    応用物理学関係連合講演会講演予稿集 2006年03月
  • 信木 関; 久慈俊郎
    日本金属学会2006年度春期(第138回)大会 2006年03月 東京 日本金属学会2006年度春期(第138回)大会
  • 千葉 雅史; 堀田 英樹; 信木 関; 久慈 俊郎
    表面科学講演大会講演要旨集 2006年 
    Mg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.
  • 信木 関; 堀田 英樹; 久慈 俊郎
    大会講演概要 2005年10月
  • MAによるCaMgV bcc合金の創製と水素吸蔵特性  [通常講演]
    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年09月 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  [通常講演]
    信木 関
    日本鋳造工学会 平成17年度支部講演会 2005年06月 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  [通常講演]
    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年05月 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  [通常講演]
    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年
  • 球状黒鉛鋳鉄の衝撃特性に及ぼす基地組織の影響  [通常講演]
    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年12月 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  [通常講演]
    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年10月 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  [通常講演]
    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年05月 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  [通常講演]
    信木 関; 塩田 俊雄; 旗手 稔; 小松 眞一郎
    The 8th Asian Foundry Congress,(AFC-8) 2003年10月 Bangkok, Thailand The 8th Asian Foundry Congress,(AFC-8)
  • Si鋳鋼の衝撃および曲げ特性  [通常講演]
    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年05月 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  [通常講演]
    信木 関; 塩田 俊雄; 旗手 稔
    The 1st Korea-Japan Conference for YFE 2003年04月 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  [通常講演]
    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年12月 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  [通常講演]
    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年10月 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  [通常講演]
    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年05月 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  [通常講演]
    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年
  • 信木 関; 塩田 俊雄; 旗手 稔
    日本鋳造工学会139回全国講演大会 2001年10月 広島 日本鋳造工学会139回全国講演大会
  • 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  [通常講演]
    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年05月 千葉 日本鋳造工学会138回全国講演大会
  • 信木関; 塩田俊雄; 旗手稔
    日本鋳造工学会全国講演大会講演概要集 2000年09月
  • 塩田俊雄; 旗手稔; 信木関
    日本鋳造工学会全国講演大会講演概要集 1999年10月
  • 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  [通常講演]
    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年

MISC

産業財産権

受賞

  • 2021年05月 (公社)日本鋳造工学会 論文賞
     フェライト基地球状黒鉛鋳鉄の衝撃特性と破壊靭性 
    受賞者: 信木関;旗手稔;山田翔平;宮本諭卓
  • 2015年05月 (公社)日本鋳造工学会 日下賞
     
    受賞者: 信木 関合金添加鋳鉄および鋳鋼の組織,機械的性質,衝撃特性に関する研究
  • 2005年 (社)日本鋳造工学会 中四国支部奨励賞
     JPN

共同研究・競争的資金等の研究課題

  • 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:
    研究期間 : 2022年04月
  • 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
    研究期間 : 2020年06月 -2021年03月
  • 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
    研究期間 : 2020年06月 -2021年03月
  • 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
    研究期間 : 2016年06月 -2017年03月
  • 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
    研究期間 : 2016年05月 -2017年03月
  • 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
    研究期間 : 2014年10月
  • 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
    研究期間 : 2009年05月 -2010年03月
  • 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
    研究期間 : 2009年05月 -2010年03月

委員歴

  • 2023年04月 - 現在   (公社)日本鋳造工学会 中国四国支部   副支部長
  • 2023年04月 - 現在   (公社)日本鋳造工学会 鋳鉄研究部会   部会長
  • 2018年12月 - 現在   (公社)日本鋳造工学会   編集委員
  • 2015年05月 - 現在   (公社)日本金属学会・中国四国支部   支部委員(鉄鋼)
  • 2015年05月 - 現在   (公社)日本鋳造工学会・中国四国支部   理事
  • 2019年04月 - 2023年03月   (公社)日本鋳造工学会 鋳鉄研究部会   幹事
  • 2019年04月 - 2023年03月   (独)日本学術振興会 鋳物第24委員会・鋳鉄分科会/鋳造プロセス分科会   運営幹事
  • 2011年10月 - 2017年09月   (公社)日本鋳造工学会・中国四国支部   支部編集委員

その他のリンク

researchmap



Copyright © MEDIA FUSION Co.,Ltd. All rights reserved.