Improving hydrogen embrittlement resistance of a modified press hardening steel by introducing retained austenite as hydrogen trap  

作　　者：Wei Ding Kai Yang Yu Gong Li Wang Ji-yao Hong Wei Li Xue-jun Jin 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University,Shanghai 200240,China [2]Institute of Advanced Steels and Materials,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [3]State Key Laboratory of Development and Application Technology of Automotive Steels,BaoSteel Research Institute,Shanghai 201900,China

出　　处：《Journal of Iron and Steel Research International》2022年第11期1864-1872,共9页

基　　金：the financial support of the National Natural Science Foundation of China(51901128,51831002);financial support from the Startup Fund for Youngman Research at SJTU(SFYR at SJTU);the support provided by Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University.

摘　　要：The effect of retained austenite(RA)with higher mechanical stability on hydrogen embrittlement resistance of a modified 22MnB5(C 0.22,Si 0.8,Mn 1.5,B 0.002,Fe balance,in wt.%)press hardening steel(PHS)has been studied.One-step quenching and partitioning(Q&P)treatment was applied to PHS,and around 6 vol.%ultra-fine RA was obtained.The ultra-fine RA was found to act as stronger hydrogen trap than dislocations and grain boundaries in martensitic matrix and can decrease the apparent diffusion coefficient of hydrogen from 5.97×10^(-7) to 3.83×10^(-7) cm^(2) s^(-1),which was verified by the combination of thermal desorption spectroscopy analysis and hydrogen permeation test.The higher mechanical stability of the ultrafine RA assures enough stability of the hydrogen trap,which results in better hydrogen embrittlement resistance in Q&P-treated PHS than the conventional directly quenched PHS.

关 键 词：Hydrogen embrittlement Press hardening steel Quenching and partitioning Retained austenite Thermal desorption spectroscopy Hydrogen permeation 

分 类 号：TG142[一般工业技术—材料科学与工程]