Microstructure evolution and hydrogen embrittlement mechanism of different zones at 316 L SS/316L SS laser-repaired coating
Source abstract
Abstract
The susceptibility of 316 L SS laser-repaired coating (S1), 316 L SS substrate (S3), and the interface (S2) between them to hydrogen embrittlement were investigated using a slow strain rate test (SSRT) method. After hydrogen charging, the contents of martensite at S1, S2, and S3 increased by 5.9 %, 20.3 %, and 20.2 %, respectively. Meanwhile, the stability of passive film on S2 is lowest compared with S1 and S3 caused by higher Fe 2 +/Fe 3+, martensitic ration, and lower contents of Cr 2O 3 and O 2-. Therefore, the weakened passive film on S2 allows hydrogen atoms to accumulate in inhomogeneities and defects, leading to stress concentration and occurrence of cracking.
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Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Additive Manufacturing Materials and Processes · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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