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| Effect of vanadium on hydrogen embrittlement susceptibility of high-strength hot-stamped steel |
| Wei-jian Chen1,2, Peng-fei Gao1,2, Shuai Wang1,2, Hong-zhou Lu3, Zheng-zhi Zhao1,2 |
1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Laboratory for Modern Transportation Advanced Metal Materials and Processing Technology, University of Science and Technology Beijing, Beijing 100083, China
3 CITIC Metal Co., Ltd., Beijing 100004, China |
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Abstract Based on the chemical composition of traditional hot-stamped steel (e.g., 22MnB5 and 30MnB5), Nb and V microalloying elements are added into 30MnB5 steel to meet the requirements of ultra-high strength, excellent ductility and potent resistance to hydrogen embrittlement (HE) at the same time. The influence of hot-stamped steel on HE was studied by conducting a hydrogen permeation method and pre-charged hydrogen slow strain rate test. Meanwhile, the experimental steel microstructures and corresponding fracture surfaces are observed and analyzed to characterize HE behavior. The results show that a finer microstructure, a lower apparent diffusion coefficient of hydrogen and a smaller percentage of strength and plasticity reduction are obtained due to the addition of the vanadium element into hot-stamped steel. Compared to the V free experimental steel, the steel with 0.14 wt.% V has a large number of dispersive precipitates and more grain boundary areas, which makes hydrogen atoms dispersedly distribute.
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Received: 11 December 2019
Published: 25 February 2021
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Wei-jian Chen,Peng-fei Gao,Shuai Wang, et al. Effect of vanadium on hydrogen embrittlement susceptibility of high-strength hot-stamped steel[J]. Journal of Iron and Steel Research International, 2021, 28(2): 211-222.
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2021, Vol. 28 
