Co-Investigator(Kenkyū-buntansha) |
宗藤 伸治 九州大学, 工学研究院, 教授 (20380587)
土山 聡宏 九州大学, 工学研究院, 教授 (40315106)
中田 伸生 東京工業大学, 物質理工学院, 准教授 (50380580)
赤間 大地 九州大学, 工学研究院, 特任助教 (80612118)
|
Budget Amount *help |
¥158,080,000 (Direct Cost: ¥121,600,000、Indirect Cost: ¥36,480,000)
Fiscal Year 2019: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2018: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2017: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2016: ¥23,920,000 (Direct Cost: ¥18,400,000、Indirect Cost: ¥5,520,000)
Fiscal Year 2015: ¥84,760,000 (Direct Cost: ¥65,200,000、Indirect Cost: ¥19,560,000)
|
Outline of Final Research Achievements |
Yielding of well-annealed poly crystalline iron occurs by the dislocation emission from grain boundary and the grain refinement strengthening coefficient increases with an increase of the shear stress τ* which is required for the dislocation emission from grain boundary. τ* is small value in pure iron but changeable depending on the kind and amount of alloying elements which have segregated at grain boundary. The results of this study proved that C, N, Ni, Si, Mn and Al make τ* increase although the degree of effect is different, while Cr does not give so large effect to τ*.
|