TY - JOUR
T1 - Structures of hydrogen-induced cracks under different hydrogen concentrations for a high strength steel
AU - Wang, Y. F.
AU - Hu, S. Y.
AU - Tian, Z. Q.
AU - Cheng, G. X.
AU - Zhang, Jianxiao
N1 - Funding Information:
The authors gratefully acknowledge the support from the National Key R&D Program of China (Grant No. 2019YFB1505301), National Natural Science Foundation of China (Grant No. 21908172 ) and China Postdoctoral Science Foundation (Grant No. BX20180245 ).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/10
Y1 - 2021/10
N2 - Quantitative prediction of the hydrogen-induced crack initiation remains challenging, partially due to the difficulties in directly measuring the hydrogen gas pressure in the crack cavity. Through detailed cross-sectional observations, this study shows that the structure of the internal cracks beneath the surface blisters, i.e., the ratio of crack depth/length, can be significantly influenced by the hydrogen charging conditions. This is attributed to the change of hydrogen gas pressure in the crack cavity at different hydrogen contents, supported by the formation of stepwise cracks near the specimen surface as well as the hydrogen concentration measurements. The post-failure crack geometry is considered a useful indicator of the level of internal gas pressure to quantitatively assess the hydrogen-induced cracking sensitivity. The mechanisms of crack initiation and propagation at different hydrogen concentrations are discussed.
AB - Quantitative prediction of the hydrogen-induced crack initiation remains challenging, partially due to the difficulties in directly measuring the hydrogen gas pressure in the crack cavity. Through detailed cross-sectional observations, this study shows that the structure of the internal cracks beneath the surface blisters, i.e., the ratio of crack depth/length, can be significantly influenced by the hydrogen charging conditions. This is attributed to the change of hydrogen gas pressure in the crack cavity at different hydrogen contents, supported by the formation of stepwise cracks near the specimen surface as well as the hydrogen concentration measurements. The post-failure crack geometry is considered a useful indicator of the level of internal gas pressure to quantitatively assess the hydrogen-induced cracking sensitivity. The mechanisms of crack initiation and propagation at different hydrogen concentrations are discussed.
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U2 - 10.1016/j.engfailanal.2021.105587
DO - 10.1016/j.engfailanal.2021.105587
M3 - Article
AN - SCOPUS:85109895041
SN - 1350-6307
VL - 128
JO - Engineering Failure Analysis
JF - Engineering Failure Analysis
M1 - 105587
ER -