Transactions of Materials and Heat Treatment

Title：Constitutive relationship of continuous rolling variable cross section panel at high temperature of high strength steel B1500HS

Authors： Lei Chengxi Yang Xin Zhu Xuyue Xing Zhongwen Xu Weili Shan Debin

Unit： Harbin Institute of Technology Shanghai Baosteel Industry Technological Service Co. Ltd.

KeyWords： high strength steel tailor rolled blank hot stamping Norton-Hoff constitutive relationship flow stress

ClassificationCode：TB125

year,vol(issue):pagenumber：2017,42(10):33-40

Abstract：

To research the rheological behavior of high strength steel B1500HS tailor rolled blank (TRB) under hot stamping conditions, the isothermal hot tensile tests at different thicknesses of 1.2-1.7 mm, initial temperatures of 650-850 ℃ and strain rates of 0.2,0.5,2,5 s-1 were conducted by Gleeble-3500 hot tensile machine, and the true stress-strain curves of B1500HS at high temperature were achieved by measuring and calculation. Then, the influences of the thickness of blank, the initial temperature of hot tensile and the strain rate on the flow stress of materials at high temperature were analyzed, and the Norton-Hoff constitutive model adding thickness modification factors was established based on the characteristics of work hardeningdynamic softening of material in the thermoforming process. Furthermore, the parameters of the Norton-Hoff constitutive model were obtained by fitting the test data. At last, the stresses calculated by the developed constitutive relationship model and the test results were analyzed by the linear regression, and the linear correlation coefficient, the root mean square error and the average relative error between them were assessed. The result shows that the results predicted by the modified Norton-Hoff constitutive relationship model are in good agreement with the test results.

Funds：

国家自然科学基金资助项目（51305101）；中国博士后科学基金项目（2013M541366）；中国博士后基金特别资助项目（2014T70326）；中央高校基本科研业务费专项资金项目（HIT. NISRIF.2014054）

作者简介：雷呈喜（1982-），男，博士，副教授，E-mail：chxlei@hit.edu.cn；通讯作者：邢忠文（1956-），男，博士，教授，博士生导师，E-mail：gchxl@hit.edu.cn

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