锻压技术

B1500HS高强钢连续轧制变截面板的高温本构关系板料成形

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

作者：雷呈喜杨信朱绪跃邢忠文徐伟力单德彬

单位：哈尔滨工业大学上海宝山钢铁股份有限公司

关键词：高强钢连续轧制变截面板热冲压 Norton-Hoff本构关系流变应力

分类号：TB125

出版年,卷(期):页码：2017,42(10):33-40

摘要：

为了研究B1500HS高强钢连续轧制变截面板热冲压时的流变力学行为，采用Gleeble-3500热拉伸机，对厚度在1.2～1.7 mm、初始温度在650～850 ℃的试样，分别以0.2，0.5，2和5 s-1的应变速率进行单向等温拉伸试验，经过测量和计算得到高温下材料的应力-应变试验曲线。然后研究不同板料厚度、热拉伸初始温度以及应变速率对高温下材料的流变应力的影响规律，基于热成形过程材料的加工硬化-动态软化这一特点，建立了加入厚度修正因子的NortonHoff本构关系，并通过拟合试验数据求取了本构关系的相关系数。最后将建立的本构关系模型预测应力值与试验结果进行线性回归分析，评估两者之间的线性相关系数、均方根误差和平均相对误差。结果表明，修正的NortonHoff本构关系与试验结果吻合较好。

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.

基金项目：

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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