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http://dx.doi.org/10.1016/j.net.2018.10.007

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

Chen, Junjie (Korea Advanced Institute of Science and Technology)
Nurrochman, Andrieanto (Korea Advanced Institute of Science and Technology)
Hong, Jong-Dae (Korea Atomic Energy Research Institute)
Kim, Tae Soon (Central Research Institute, Korea Hydro and Nuclear Power Co., Ltd.)
Jang, Changheui (Korea Advanced Institute of Science and Technology)
Yi, Yongsun (Khalifa University)
Publication Information
Nuclear Engineering and Technology / v.51, no.2, 2019 , pp. 479-489 More about this Journal
Abstract
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.
Keywords
Environmentally-assisted fatigue; Alloy 690; 316 SS; Oxide layer; Electrochemical analysis;
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Times Cited By KSCI : 1  (Citation Analysis)
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