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http://dx.doi.org/10.1016/j.net.2020.04.023

Role of residual ferrites on crevice SCC of austenitic stainless steels in PWR water with high-dissolved oxygen  

Sinjlawi, Abdullah (Korea Advanced Institute of Science and Technology)
Chen, Junjie (Korea Advanced Institute of Science and Technology)
Kim, Ho-Sub (Korea Advanced Institute of Science and Technology)
Lee, Hyeon Bae (Korea Advanced Institute of Science and Technology)
Jang, Changheui (Korea Advanced Institute of Science and Technology)
Lee, Sanghoon (Korea Institute of Materials Science)
Publication Information
Nuclear Engineering and Technology / v.52, no.11, 2020 , pp. 2552-2564 More about this Journal
Abstract
The crevice stress corrosion cracking (SCC) susceptibility of austenitic stainless steels was evaluated in simulated 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 in the 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 specimens showed SCC cracks in the oxygenated condition, indicating poor crevice SCC resistance. It was found that residual ferrites were selectively dissolved because of the galvanic corrosion coupled with the neigh-bouring austenite phase, resulting in SCC initiation in SS304. Crack morphologies were mostly transgranular assisted by the damaged δ-ferrite and deformation-induced slip bands.
Keywords
Residual ${\delta}$-ferrite; Austenitic stainless steel; Crevice beam bent (CBB); Stress corrosion cracking (SCC);
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