锻压技术

超高强度钢板热流变行为试验研究及本构模型仿真分析

英文标题：Experimental research on hot deformation behavior of ultra high strength steel and simulation analysis of the constitutive relationship

作者：李国城邓涛卢任之

单位：重庆交通大学

关键词：硼钢热流变应力-应变曲线本构模型

分类号：TG306

出版年,卷(期):页码：2016,41(3):110-115

摘要：

为研究超高强度钢板在高温下的热流变行为，以硼钢22MnB5为研究对象，利用Gleeble-1500D热模拟试验机，在600~900 ℃温度区间，分别以0.01，0.1和1 s-1的应变速率对样件进行等温拉伸试验，得到不同条件下的应力-应变关系曲线,试验表明，温度、应变速率、应变量对流变应力的影响存在相互作用。采用拟合多项式系数的方法拟合不同因素对流变应力的影响，建立硼钢22MnB5高温下的热流变行为的本构模型，计算结果与试验结果很好地吻合，验证了建立的本构关系模型能较为准确地预测不同条件下的应力-应变关系。

For boron steel 22MnB5 to research the deformation behavior of ultra high strength steel at high temperature, some isothermal uniaxial tensile tests were carried out by thermo-mechanical simulator Gleeble 1500D at the temperature range of 600-900 ℃ with strain rates of 0.01，0.1 and 1 s-1 respectively, and the stress-strain curves under different conditions were obtained. Experiments show that the influences of temperature, strain rate and strain on the flow stress are of mutual relations. In consideration of the interaction of different factors, the constitutive model of boron steel 22MnB5 at high temperature was established by polynomial fitting, and the computational data agrees well with the experimental data. Furthermore, the above model can predict the relationship between the stress and strain under the different conditions.

基金项目：

重庆市科委基础与前沿研究计划项目（CSTC2013 JCYJA0794）

李国城（1990-），男，硕士研究生通讯作者：邓涛(1982-),男，博士，副教授

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