Transactions of Materials and Heat Treatment

Title：Optimization on hot stamping formability for 22MnB5 high strength steel based on response surface method

Authors： Li Qihan Jing Shufan Gao Song Xing Jigang Gu Dongwei Xu Chuanwei Ying Liang

Unit： Changchun University of Technology Dalian University of Technology

KeyWords： 22MnB5 high strength steel hot stamping forming temperature formability response surface method

ClassificationCode：TG142

year,vol(issue):pagenumber：2020,45(6):93-101

Abstract：

The finite element model of hot stamping for high strength steel was established to simulate the forming effects at initial temperatures of 700, 750, 800 and 850 ℃. Then, the optimum forming temperature was obtained by analyzing and studying the forming limit and forming effect of specimen at high temperature, and the reliability of the simulation was verified by the test data. Furthermore, for U-shaped parts, the influences of the main process parameters on the forming properties at the optimum forming temperature were studied, the process parameters were optimized, and the best combination of process parameters was obtained. The results show that the maximum forming limit of sheet method increases with the increasing of temperature, and the forming effect of 22MnB5 high strength steel sheet is best at 700 °C. When the specimen is formed at 700 °C, its maximum thinning amount is 36 mm, the formability is good and the area of insufficient forming is small. Thus, the optimal combination of process parameters is obtained by response surface analysis methodology, and it is verified that under the optimized combination of process parameters, the fully formed area increases by 23% and the wrinkle tendency area decreases by 34%.

Funds：

国家自然科学基金资助项目（51805045, 51705065）；吉林省科技发展计划项目（20190302100GX）

李奇涵（1970-），男，硕士，教授 E-mail：liqihan@ccut.edu.cn 通讯作者：高嵩（1987-），男，博士，讲师 E-mail：gaosong@ccut.edu.cn

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