Role of residual ferrites on crevice SCC of austenitic stainless steels in PWR water with high-dissolved oxygen
Creators
- 1. Korea Advanced Institute of Science and Technology, Daejeon (Korea, Republic of)
- 2. Korea Institute of Materials Science, Changwon (Korea, Republic of)
Description
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 neighbouring austenite phase, resulting in SCC initiation in SS304. Crack morphologies were mostly transgranular assisted by the damaged δ-ferrite and deformation-induced slip bands
Additional details
Publishing Information
- Journal Title
- Nuclear Engineering and Technology
- Journal Volume
- 52
- Journal Issue
- 11
- Series
- 31 refs, 12 figs, 4 tabs
- Journal Page Range
- p. 2552-2564
- ISSN
- 1738-5733
INIS
- Country of Publication
- Korea, Republic of
- Country of Input or Organization
- Korea, Republic of
- INIS RN
- 52113480
- Subject category
- S36: MATERIALS SCIENCE; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Descriptors DEI
- AUSTENITIC STEELS; BEAMS; CRACKING; CRACKS; DEFORMATION; DISSOLVED GASES; ELECTROCHEMICAL CORROSION; FERRITES; HYDROGENATION; LEAKS; MORPHOLOGY; OXYGEN; PIPES; PWR TYPE REACTORS; SLIP; STAINLESS STEELS; STRESS CORROSION
- Descriptors DEC
- ALLOYS; CARBON ADDITIONS; CHEMICAL REACTIONS; CORROSION; DECOMPOSITION; ELEMENTS; ENRICHED URANIUM REACTORS; FERRIMAGNETIC MATERIALS; FLUIDS; GASES; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; IRON COMPOUNDS; MAGNETIC MATERIALS; MATERIALS; NONMETALS; OXYGEN COMPOUNDS; POWER REACTORS; PYROLYSIS; REACTORS; SOLUTES; STEELS; THERMAL REACTORS; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS; TUBES; WATER COOLED REACTORS; WATER MODERATED REACTORS