EBSD解析によるステンレス鋼の疲労損傷検出（結晶粒界に着目した解析）

抄録

In order to develop more sensitive EBSD parameters to detect fatigue damage in austenitic stainless steel used as key material for nuclear reactor components, the new EBSD parameter focused on grain boundaries, which was referred to as the averaged grain boundary local misorientation (BM_ave), has been proposed by modifying the existing EBSD parameter of the averaged local misorientation (M_ave). The applicability of the new parameter BM_ave to the fatigue damage detection was discussed by comparing with the exiting parameter M_ave. As a result, it was found that BM_ave was more sensitive parameter than M_ave. Especially, BM_ave (Option 1), which was calculated using the crystal orientations at points just adjacent to grain boundaries, was the most effective parameter for the fatigue damage detection.