Comparison of oxide layers formed on the low-cycle fatigue crack surfaces of Alloy 690 and 316 SS tested in a simulated PWR environment

Low-cycle fatigue (LCF) tests were performed for Alloy 690 and 316 SS in a simulated pressurized water reactor (PWR) environment. Alloy 690 showed about twice longer LCF life than 316 SS at the test condition of 0.4% amplitude at strain rate of 0.004%/s. Observation of the oxide layers formed on the...

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Published inNuclear engineering and technology Vol. 51; no. 2; pp. 479 - 489
Main Authors Chen, Junjie, Nurrochman, Andrieanto, Hong, Jong-Dae, Kim, Tae Soon, Jang, Changheui, Yi, Yongsun
Format Journal Article
LanguageKorean
Published 2019
Subjects
Electrochemical analysis
Oxide layer
Environmentally-assisted fatigue
Alloy 690
316 SS
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Summary:Low-cycle fatigue (LCF) tests were performed for Alloy 690 and 316 SS in a simulated pressurized water reactor (PWR) environment. Alloy 690 showed about twice longer LCF life than 316 SS at the test condition of 0.4% amplitude at strain rate of 0.004%/s. Observation of the oxide layers formed on the fatigue crack surface showed that Cr and Ni rich oxide was formed for Alloy 690, while Fe and Cr rich oxide for 316 SS as an inner layer. Electrochemical analysis revealed that the oxide layers formed on the LCF crack surface of Alloy 690 had higher impedance and less defect density than those of 316 SS, which resulted in longer LCF life of Alloy 690 than 316 SS in a simulated PWR environment.
Bibliography:KISTI1.1003/JNL.JAKO201915540676720
ISSN:1738-5733
2234-358X