205 超細粒鋼の疲労き裂伝ぱにおよぼす微視構造の影響(セッション7)

概要

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Fatigue crack propagation behavior of ultrafine-grained steel with the average grain size of less than 2μm was investigated. The effect of microstructure and crystallographic orientation was investigated by EBSD (Electron Backscatter Diffraction) method. The results show that crack propagation rate was larger in the ultrafine-grained specimen in spite of the small grain size than that in coarse-grained specimens when compared at the same stress intensity range. The improvement in the crack propagation behavior is attributed to the roughness-induced crack closure primarily due to the bifurcation. The mechanism of the bifurcation was explainable by introducing the slip factor, ζ, considering the slip systems in the stress field at crack tip.
社団法人日本機械学会の論文
2005-03-13