Microstructure and hardening of ion-irradiated heat-affected zone of reactor pressure vessel steel

Ha, Yoosung ; Takamizawa, Hisashi ; Katsuyama, Jinya ; Nishiyama, Yutaka ; Yoshida, Kenta*; Toyama, Takeshi*; Nagai, Yasuyoshi*

Heat-affected zone of stainless over-ray clad is included in a supposed cracking area during the pressurized thermals shock regime. It is necessary to confirm the irradiation embrittlement susceptibility of HAZ compared with that of matrix. In this study, Fe $^{2+}$ ion irradiated into HAZ and matrix. We discussed the correlation between irradiation hardening and microstructure in HAZ. The irradiation hardening of SCFGHAZ is highest. As results of TEM observation, the precipitates dispersed with ~200 nm of sizes in SCFGHAZ specimen. Also, dislocation loops with high density by irradiation exist.

Language	:	Japanese
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Meeting title	:	日本原子力学会2017年春の年会
Held date	:	2017/03
Location (city)	:	平塚
Location (country)	:	日本
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Registration No. : BB20161801
JAEA Abstracts No. :
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