オーステナイトステンレス鋼における微小疲労き裂発生挙動と照)損傷の影響
Fatigue Micro-crack Initiation Behavior and Effect of Irradiation Damage on Itin Austenitic Stainless Steel
著者:
中井 亮介 Ryosuke NAKAI 佐藤 佑毅 Yuki SATO 野上 修平 Shuhei NOGAMI 長谷川 晃 Akira HASEGAWA
発刊日:
公開日:
FatigueGrain boundaryLocalized deformationMicro-crack Initiation Irradiation damageProton irradiationSlip bandTriple junctionTwin boundary
概要
The effect of irradiation on slip band formation and growth and micro-crack initiation behavior under low cycle fatigue in SUS316L austenitic stainless steel was investigated using accelerator-based proton irradiation and a low cycle fatigue test at room tem perature in air. The micro-crack initiation was observed at slip band, grain boundary, twin boundary, and triple junction regardless of the total strain range and the proton irradiation. In unirradiated specimens, the micro-crack initiation life dropped by 75 -90% due to the increase of the plastic strain range. Under the condition the plastic strain range was 0.4%, the micro-crack initiation was observed mainly at the grain boundary. On the other hand, under the condition the plastic strain range was 1.0%, the n umber fractions of the micro-crack initiation in slip band and twin boundary were increased. In proton-irradiated specimens, the micro-crack initiation life decreased by 50-80% and the micro-crack initiation was observed mainly at slip band and twin boundary.
