| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Effect of Triaxial Stress State on PWSCC Initiation Behavior of Nickel-based Alloy in Nuclear Power Plants |
| Author(s) |
Seung Chang Yoo, Kyoung Joon Choi, Jong-Sung Kim, Il Soon Hwang, Ji Hyun Kim |
| On-Site Speaker (Planned) |
Seung Chang Yoo |
| Abstract Scope |
Effect of triaxial stress on the PWSCC initiation of nickel-based alloy was investigated. Thermal aging was simulated by heat treatment at 400 °C which does not cause an excessive formation of second phases that cannot be formed in nuclear power plant service conditions. Triaxial stress was applied by making round notch at reduced section of tensile test specimens. Detail microstructural analysis was conducted with electron microscopy, electron back-scatter diffraction, etc. Slow strain rate test with direct current potential drop method was conducted to evaluate stress corrosion crack initiation susceptibility in primary water environment. PWSCC initiation time of 10 y thermally aged specimen was the shortest while those of as-received and 20 y thermally aged specimen was longer than that. However, the trend was changed under triaxial stress state; 20 y thermally aged specimen marked the highest susceptibility to PWSCC initiation while as-received specimen showed the lowest susceptibility. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |