Transactions of Materials and Heat Treatment

Title：Influence of prestretching on bending springback of different high strength steels used in automobile

Authors： Zhang Jun1 2 Li Shaobo1 2 Ma Wenyu1 2 Wang Baochuan1 2 Zheng Xuebin1 2 Yang Jianwei1 2

Unit： 1.Research Institute of Technology of Shougang Group Co. Ltd. 2.Beijing Key Laboratory of Green Recycling Process for Iron & Steel Production Technology

KeyWords： high strength steel springback prestretching strain thinning microstructure

ClassificationCode：TG386

year,vol(issue):pagenumber：2018,43(12):20-24

Abstract：

The springback behavior of high strength steel used in automobile was investigated by experiment, and the influence of prestretching on springback of material was mainly analyzed. The specimens of HC330/590DH, HC340/590DP and HC420/780DP were prestretched respectively, and then the specimens were bended at three points after prestretching. Then, the springback angle was measured, and the strain, thinning, springback and microstructure were analyzed. The results show that for different prestretching amounts of the same material, the springback angle increases with the increase of the prestretching value. However, for the same type of high strength steel with different strengths, the springback increases with the increasing of material strength. After bending of HC340/590DP, the grain in the inner area is compressed, and the grain in the outer area is stretched. Therefore, for two materials with the same strength and different microstructures, the srpingback of DP steel is higher than that of DH steel.

Funds：

基金项目:国家重点研发计划专项资助(2017YFB0304401)

作者简介：章军（1973- ），男，硕士，高级工程师 Email：zhangjun@shougang.com.cn 通讯作者：马闻宇（1988- ），男，博士，工程师 Email:wymaustb@163.com

Reference：

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