Abstract
The digital image correlation method has been applied to directly observe the local strain and crack formation in mooring chain steel during tensile tests in air or when simultaneously charging hydrogen in different ways, viz. including/excluding the notch root. Interestingly, hydrogen accumulation promoted crack initiation on the surface when the local strain reached approximately 0.9%, while strain of 19% to 20% was reached in the hydrogen-free specimens before visible crack formation. Even through the stress–strain curves prior to the sudden drop indicate a negligible effect of hydrogen, its presence can greatly reduce the stress-induced crack initiation. In addition, hydrogen introduced while avoiding the notch root can disorganize the regular distribution of strain produced by the notch before crack initiation. Therefore, hydrogen-induced embrittlement below the critical stress criterion can be explained by hydrogen-enhanced localized plasticity, while above the critical stress criterion, hydrogen-enhanced decohesion provides a better explanation.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grants Nos. 51271108 and 51871145) and the Shanghai Natural Science Foundation (11ZR1412800). The authors would like to thank Prof. Yin Jiang (Jiangsu Asian Star Anchor Chain Co. Ltd.) for providing us the new-type R5 mooring chain steel, which we studied in this work. In addition, we would like to thank Editage (www.editage.com) for English language editing.
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Cheng, X., Zhang, X., Wu, Y. et al. The Character of Hydrogen Embrittlement in Mooring Chain Steel. JOM 72, 2003–2010 (2020). https://doi.org/10.1007/s11837-020-04022-w
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DOI: https://doi.org/10.1007/s11837-020-04022-w