高サイクル疲労下におけるすべり変形挙動に及ぼす界面の影響 : 二相 (α/γ) ステンレス鋼双結晶のすべり解析

抄録

The purpose of the present study is to investigate the unique slip behavior near the interface boundary (IB) in the high cycle fatigue. Push-pull fatigue tests were carried out for two-phase (α/γ) stainless steel bicrystal, which consists of ferritic (Fe 30 Cr) and austenitic (FellCr 19 Ni) single crystals. In the tests, the unique slip, which is not expected from the crystal orientation, was observed in the γ-phase near the IB. The analysis of finite element method reveals that the slip is caused by the increase of resolved shear stress, τ_rss, due to the constraint of deformation at the IB.