縦界面を有する二相(α/γ)ステンレス鋼双結晶を用いた高サイクル疲労条件下におけるすべり挙動解析

概要

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In order to investigate the effect of the constraint of deformation at an interface on the slip behavior, a test is carried out at room temperature in high-cycle fatigue of a two-phase (α/γ) stainless steel bicrystal, which consists of ferritic (Fe30Cr) and austenitic (Fe15Cr15Ni) single crystals, with a longitudinal interface parallel to the load axis. In this bicrystal, the active slip direction intersects the interface. Since the yield stress of α-phase is much higher than that of γ-phase, the slip takes place only in the γ-phase. Not only primary slip lines expected from the crystallographic orientation but also additional slip lines are observed in the γ-phase near the interface. The stress distribution is analyzed by a finite element method (FEM). It shows that the resolved shear stress, τ_rss, on the specific slip system near the interface increases, and the activated slip system corresponds to the additional slip experimentally observed. The region where the additional slip are observed agrees well with the one where the resolved shear stress exceeds the critical stress of the γ-stainless steel single crystal. This signifies that the characteristic slip behavior near the interface is attributed to the increase of τ_rss due to the constraint of deformation.
社団法人日本機械学会の論文
2002-05-25