Transactions of Materials and Heat Treatment

Title：Influence of preformed parts on the thinning rate of hot stamping for ultra high strength steel sheet

Authors： Li Bing Zhang Chun Wang Min Xiao Haifeng

Unit： Hubei University of Automotive Industry Xi′an Jiaotong University

KeyWords： ultra high strength steel hot stamping FEM pre-forming thinning rate

ClassificationCode：TG386

year,vol(issue):pagenumber：2017,42(7):30-35

Abstract：

In order to reduce the thinning rate of ultra high strength steel sheet in hot stamping process, for wheel side cover, four kinds of preformed part structure schemes were designed, and the influences of shape and size of preformed parts on the thinning rate were analyzed by the FEM simulation. Then, the hot stamping experiment was carried out based on the simulation results. The forming results indicate that the microstructure of hot stamping parts consists of lath martensite, and the micro-hardness reaches above 460 HV. The maximum material thinning rate is on the ball pocket, and the pre-forming helps to reducing the material thinning rate. The larger the material storage area of preformed parts is, the smaller the material thinning rate of hot stamping parts is. When the preformed part is a circular arch with a depth of 22.8 mm and cutting corners, the material thinning rate is the minimum as 11.67%, and the wall thickness uniformity is better. The experimental results are approximately accordant with the numerical simulation results.

Funds：

国家自然科学基金资助项目（51205116）；湖北省教育厅科学计划项目（Q20151803）；湖北省高等学校优秀中青年科技创新团队项目（T201518）

作者简介：李兵（1981-），男，硕士，讲师，E-mail：libing42158823@163.com

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