ピーニングによる応力腐食割れ防止効果に関する研究
Study on mitigation of stress corrosion cracking by peening
著者:
前口 貴治 Takahru MAEGUCHI 堤 一也 Kazuya TSUTSUMI 豊田 真彦 Masahiko TOYODA 太田 高裕 Takahiro OHTA 岡部 武利 Taketoshi OKABE 佐藤 知伸 Tomonobu SATO
発刊日:
公開日:
Residual stressStress corrosion crackingUltrasonic shot peeningWater jet peening
概要
In order to verify stability of residual stress improvement effect of peeing for mitigation of stress corrosion cracking in components of PWR plant, relaxation behavior of residual stress induced by w ater jet peening(WJP) and ultrasonic shot peening(USP) on surface of alloy 600 and its weld metal was investigated under various thermal aging and stress condition considered for actual plant operatio n. In the case of thermal aging at 320-380°C, surface residual stress relaxation was observed at the early stage of thermal aging, but no significant stress relaxation was observed after that. Applied stress below yield stress does not significantly affect stress relaxation behavior of surface residual stress. Furthermore, it was confirmed that cyclic stress does not accelerate stress relaxation.
