학술논문
Comparison of oxide layers formed on the low-cycle fatigue crack surfaces of Alloy 690 and 316 SS tested in a simulated PWR environment
Document Type
Article
Author
Source
Nuclear Engineering and Technology, 51(2), pp.479-489 Apr, 2019
Subject
Language
English
ISSN
2234-358X
1738-5733
1738-5733
Abstract
Low-cycle fatigue (LCF) tests were performed for Alloy 690 and 316 SS in a simulated pressurized waterreactor (PWR) environment. Alloy 690 showed about twice longer LCF life than 316 SS at the test conditionof 0.4% amplitude at strain rate of 0.004%/s. Observation of the oxide layers formed on the fatiguecrack surface showed that Cr and Ni rich oxide was formed for Alloy 690, while Fe and Cr rich oxide for316 SS as an inner layer. Electrochemical analysis revealed that the oxide layers formed on the LCF cracksurface of Alloy 690 had higher impedance and less defect density than those of 316 SS, which resulted inlonger LCF life of Alloy 690 than 316 SS in a simulated PWR environment