锻压技术

QP980和DP980高强钢板的抗延迟断裂性能

英文标题：Delayed fracture resistance performance for high strength steel sheet QP980 and DP980

作者：濮振谦林建平叶又赵强

关键词：预应变高强钢延迟断裂 DP980 QP980

分类号：TG142.1+2

出版年,卷(期):页码：2017,42(4):153-158

摘要：

高强钢零件的延迟断裂现象是汽车使用安全性的严重威胁。针对QP980和DP980两种高强度汽车用钢板，基于单向拉伸实验和电化学充氢，分析了预变形对高强钢充氢后的伸长率及强度的损失规律，对比了DP980和QP980的抗延迟断裂性能。研究发现，预应变从0至7%变化时，QP980和DP980均发生严重的塑性损失，但在同一预应变下，QP980的各项塑性损失几乎均大于DP980，得出QP980的抗延迟断裂性能较DP980差。通过断口形貌分析，发现QP980相比DP980更易受到氢的侵入从而脆化，从而验证了实验结果的准确性和科学性。

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.

基金项目：

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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