Transactions of Materials and Heat Treatment

Title：Delayed fracture resistance performance for high strength steel sheet QP980 and DP980

Authors： Pu Zhenqian Lin Jianping Ye You Zhao Qiang

Unit： Tongji University Pan Asia Technical Automotive Center

KeyWords： pre-strain high strength steel delayed fracture DP980 QP980

ClassificationCode：TG142.1+2

year,vol(issue):pagenumber：2017,42(4):153-158

Abstract：

Delayed fracture phenomenon of high strength steel parts is a serious threat to the safety of automobile use. For high strength steel sheet DP980 and QP980 used in the vehicle, based on the uniaxial tension test and electrochemical hydrogen charging, the loss regularities of pre-deformation on elongation after high strength steel sheet hydrogen charging and strength change were studied, and the delayed fracture resistance performances for high strength steel sheet DP980 and QP980 were compared. The result shows that when the pre-strain changes from 0 to 7%, both materials of DP980 and QP980 have great ductility losses, but with the same pre-strain, the ductility loss of QP980 is always greater than that of DP980. So, it is concluded that the delayed fracture resistance performance of QP980 is weaker than that of DP980. By the analysis of fracture surface morphology, it is found that QP980 is more permeable by hydrogen than DP980, and the experiment results are of accuracy and scientificity.

Funds：

国家自然科学基金资助项目（51375346）

濮振谦（1991-），男，硕士研究生 E-mail：lofty_thill@163.com 通讯作者：林建平（1958-），男，教授，博士生导师 E-mail：jplin58@tongji.edu.cn

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