Abstract
SCC behavior on hardened surface layer of 316(LC) in high temperature water was studied. The hardened surface layer was prepared by laboratory experiments. A depth profile of residual stress at the hardened surface layer was estimated using SPring-8. The results showed the residual tensile stress was more than 900 MPa at the top of surface layer where HV was about 300. SCC susceptibility was estimated by a creviced bent beam test in water containing 200 ppb SO42– and 8 ppm dissolved oxygen at 561 K. It became clear that the threshold stress of SCC for 316(LC) existed and the value was about 600 MPa in this condition. The residual tensile stress caused by surface finishing is considered to play an important role in SCC.
