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| 1.
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論文
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佐藤, 宏一郎 ; 門前, 亮一 ; 北川, 和夫
概要:
金沢大学理工研究域機械工学系
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| 2.
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丸山, 武士 ; 門前, 亮一 ; 兼子, 佳久 ; 北川, 和夫
概要:
金沢大学理工研究域機械工学系
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| 3.
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門前, 亮一 ; 北川, 和夫
概要:
金沢大学理工研究域機械工学系
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| 4.
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二口, 光伸 ; 門前, 亮一 ; 北川, 和夫
概要:
金沢大学理工研究域機械工学系
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| 5.
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穐田, 竹男 ; 後藤, 昌英 ; 北川, 和夫 ; 生水, 雅之 ; 広瀬, 幸雄
概要:
Microstructures and mechanical properties of ultra fine-grained low carbon steels fabricated by equal channel angular pr
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essing (ECAP) were investigated. Several specimens statically annealed for 5 hours at temperatures of 773-873K were studied simultaneously. Electron back-scattering diffraction (EBSD) measurements were carried out for microstructure observation. Differential scanning calorimeter (DSC) curves were obtained for studying the thermal stability of specimens. The initial grain size of ∼10μm in the ferrite-pearlite steel was refined to ∼0.2μm by 4 passes of ECAP. The tensile strength of the as-ECAPed specimen was around 2 times higher than that of the initial normalized specimen, although the ductility decreased by half after the process. At annealing temperature of 773-823K, tensile strength and yield stress decreased as the average grain size of each specimen increased. However the grain growth by annealing was not significant. At annealing temperature of 873K, the nonuniform grain growth occurred suddenly, and as a result the tensile strength decreased. On the Hall-Petch relation diagram, the gradient of the diagram over the average grain size of 1mm was slightly different from that of under 1μm. In addition, the nonuniform radical grain growth at the temperature of 873K was in accord with the appearance of the exothermic peak in the DSC curves. The accumulation of the local strain in the 823K-annealed specimen was investigated by the kernel average misorientation (KAM) approach using EBSD, and it is suggested that accumulation of the local strain in the 823K-annealed specimen is one of the causes of the nonuniform radical grain growth at the temperature of 873K.
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| 6.
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その他
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北川, 和夫 ; Kitagawa, Kazuo
概要:
金沢大学理工研究域機械工学系
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| 7.
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矢ヶ部, 洋一 ; 鈴木, 保 ; 北, 和久 ; 門前, 亮一 ; 北川, 和夫
概要:
金沢大学理工研究域機械工学系
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| 8.
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山名, 一男 ; 山本, 之子 ; 中村, 静夫 ; 北川, 和夫 ; 吉村, 卓二 ; 真野, 稔正 ; 新谷, 良智
概要:
金沢大学理工学域<br />The uniaxial compression was applied with a hot press apparatus for the partially sintered performs with t
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hree chemical compositions, 3 mol% Y_2O_3-ZrO_2(TZ-3 Y) , 6 mol% Y_2O_3-ZrO_2 (TZ-6Y), and 8 mol% Y_2O_3-ZrO_2(TZ-8Y). The change in size was measured after pressing. Obviously, the densification occurred below 1350℃ and superplastic defamation appeared mainly over 1350℃. The grain size at 1500℃ was 2 μm in TZ-8 Y in comparison with 0.4 μm in TZ-3 Y. TZ-6 Y and TZ-8 Y had a porosity of 5-15% because of the rapid grain growth. Consequently, small bending strengths in the range of 20-30 kgf/mm^2 were obtained. In TZ-3 Y, the compressive deformation gave a rapid increase in; strength up to 140 kgf/mm^2. But the strength decreased above 1450℃, due to the formation of R-phase, by Kitano et al. (1987).
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| 9.
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石川, 信之 ; 兼子, 佳久 ; 門前, 亮一 ; 北川, 和夫
概要:
金沢大学理工研究域機械工学系
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| 10.
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佐藤, 宏一郎 ; 太田, 精一 ; 門前, 亮一 ; 北川, 和夫
概要:
金沢大学理工研究域機械工学系
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