Changes in strength of PNC-FMS for wrapper tube of fast reactor by long-term thermal aging

Fujita, Koji; Shizukawa, Yuta ; Tanno, Takashi ; Yano, Yasuhide

Japan Atomic Energy Agency has been developed 11 Cr martensitic steel PNC-FMS as the candidate material for wrapper tubes of fast reactors. Developing database of property changes by thermally aging is necessary to clarify the irradiation effects from post irradiation experimental data. Tensile tests and hardness measurement of PNC-FMS aged up to 45,000 hours were carried out. Tensile test and hardness test after the thermal aging showed that the strength of specimens aged at 600 $^{circ}$ C or higher decreased with aging time. It was shown that the decrease trend was described by linear correlation with Larson-Miller parameter. This means that the strength decrease should have been made by microstructural degradation due to the diffusion-controlled process.

Language	:	Japanese
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Meeting title	:	日本原子力学会2023年春の年会
Held date	:	2023/03
Location (city)	:	東京
Location (country)	:	日本
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Keywords	:	フェライト/マルテンサイト鋼; 熱時効効果; 引張試験; 硬さ試験
Research Facility	:	MMF(照射材料試験施設)
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Registration No. : BB20221592
JAEA Abstracts No. :
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