2932 オーステナイト系ステンレス鋼の BWR 環境中疲労き裂進展挙動とその評価線図の提案

概要

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Effects of water chemistry, stress ratio and load rising time on the fatigue crack growth rate of austenitic stainless steels were investigated in the simulated BWR water environment. Tested materials were heat treated at 620℃ for 24 h prior to the crack growth test. Stress ratio R were selected as 0.1,0.5 and 0.8 and the effects of load rising time were investigated up to T_r=5970 s. Crack growth rate was accelerated as increasing stress ratio and load rising time. Crack growth data are compared with the reference curve in JSME Fitness-for-Service Code. It was found that the current reference curve maintains the conservatism with an adequate margin for SUS304,SUS304L, SUS316L and 316NG steels in a reactor in-core water environment.
社団法人日本機械学会の論文
2002-09-20