Effect of vanadium on hydrogen embrittlement susceptibility of high-strength hot-stamped steel

• 作者: Wei-jian Chen Peng-fei Gao Shuai Wang Hong-zhou Lu Zheng-zhi Zhao
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 211-222
• 页数: 12页
• 语种: 英文

摘要

Based on the chemical composition of traditional hot-stamped steel(e.g.,22MnB5 and 30MnB5),Nb and V microalloy-ing 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 con-ducting 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.