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| Effect of Strain Rate on Hydrogen Embrittlement Susceptibility of DP780 Steel with Hydrogen Pre-charging |
WANG Zhen, LIU Jing( ), ZHANG Shiqi, HUANG Feng |
| Hubei Engineering Technology Research Center of Marine Materials and Service Safety, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China |
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Abstract The hydrogen embrittlement susceptibility of DP780 steel under different strain rates (10-4, 10-5 and 10-6 s-1) was studied by means of slow strain rate tensile test and electrocheminal hydrogen pre-charging. The results showed that the hydrogen embrittlement susceptibility increased with decreasing strain rate, while the decreasing increment of the hydrogen embritttlement susceptibility was related to the hydrogen pre-charging parameters. When the pre-charging current density was low, pre-charged hydrogen content was low and there was no hydrogen-induced cracks in the steel. More hydrogen atoms could diffuse to the center of sample with the decreasing strain rate, which led to the increasing width of brittle region in fracture surface center portion and hydrogen embrittlement susceptibility of the steel. However, when the pre-charging hydrogen current density was over 30 mA/cm2, pre-charged hydrogen content increased to 8.5 mg/L and the initial hydrogen-induced cracks generated in the steel could act as hydrogen traps, which could influence the inward diffusion and aggregation of hydrogen, therewith induce hydrogen embrittlement as a result of capturing hydrogen atom. Therefore, the hydrogen embrittlement sensitivity of the steel decreases with the increase of strain rate.
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Received: 09 December 2020
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| Fund: National Natural Science Foundation of China(51871171) |
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Corresponding Authors:
LIU Jing
E-mail: liujing@wust.edu.cn
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About author: LIU Jing, E-mail: liujing@wust.edu.cn
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