부산대학교 도서관

The crevice stress corrosion cracking (SCC) susceptibility of austenitic stainless steels was evaluated insimulated pressurized water reactor (PWR) environments. To simulate the abnormal condition in temporary clamping devices on leaking small bore pipes, crevice bent beam (CBB) tests were performed inthe oxygenated as well as hydrogenated conditions. No SCC cracks were found for SS316 in both conditions. SS304 also showed good resistance in the hydrogenated condition. However, all SS304 specimensshowed SCC cracks in the oxygenated condition, indicating poor crevice SCC resistance. It was found thatresidual ferrites were selectively dissolved because of the galvanic corrosion coupled with the neighbouring austenite phase, resulting in SCC initiation in SS304. Crack morphologies were mostly transgranular assisted by the damaged d-ferrite and deformation-induced slip bands.