027 α鉄中の刃状転位の運動速度に及ぼす水素濃度の影響に関する原子モデルを用いた検討(GS4-1 一般セッション)

概要

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Plastic deformation (dislocation motion) is considered play an important role in hydrogen embrittlement. However, the different effects on dislocation motion for pure iron were reported, that is softening and/or hardening in the presence of hydrogen. We already reported that the energy barrier for dislocation motion decrease in the presence of hydrogen, and the effect of hydrogen on dislocation motion transit from softening to hardening in increasing the applied shear stress. These studies, however, were performed under the specific hydrogen concentration conditions, thus the effect of hydrogen concentration should be clarified. In this study, we evaluate the energy barriers for dislocation motion under several hydrogen concentrations to investigate the occurrence conditions of hardening/softening. Our results indicate that the softening and hardening occur under low hydrogen concentration conditions. In counter, onlyhardening could occur under higher hydrogen concentration conditions.
一般社団法人日本機械学会の論文
2010-10-09