PWR環境中でのステンレス鋼の環境効果（レプリカ観察による亀裂発生・成長挙動の調査）
概要
The purpose of this study is to investigate environmental effects on SUS316 in different strain rate condition. The fatigue tests were conducted under different strain rate (0.4%/s and 0.004%/s) in simulated PWR environment with interrupting tests and the effect of strain rate on crack growth rate was evaluated by the observation of test specimen surface. From the results of investigation, the followings were confirmed; ・The effect of strain rate on crack growth rate is larger in 0.004%/s than 0.4%/s. ・The coalescence rate of crack in 0.4%/s is larger than that in 0.004%/s. ・The lower strain rate promotes environmental effect that decreases fatigue life by the increase of crack growth rate and not by that of crack coalescence.
