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Effect of nature of grain boundary on void distribution during irradiation in austenitic stainless steels

Sekio, Yoshihiro  ; Yamashita, Shinichiro   ; Yoshitake, Tsunemitsu ; Nishinoiri, Kenji; Takahashi, Heishichiro*

In this study, microstructural observation of Fe-15Cr-15Ni ternary model alloy and PNC316 irradiated in JOYO was performed to clarify the defect accumulation process in the vicinity of grain boundary and also the relationship between grain boundary coherency and the void structure developing process was evaluated. As the result of microstructural observation, the followings are obtained; void denuded zone (VDZ) was developed in the vicinity of the low symmetry grain boundary of Fe-15Cr-15Ni whereas no VDZ developed in the vicinity of high symmetry grain boundary. In the case of PNC316, narrow VDZ was developed only at the low symmetry grain boundary.

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