中文摘要：

在实验温度500、650、700、800℃和应变速率0.01、0.1、1.0 s-1条件下,研究了高强钢22Mn B5单向热拉伸的应变、应变速率和变形温度对流动性能的影响;建立了22Mn B5钢的热冲压塑性本构关系。它很好地描述了单向热拉伸时真应力—应变曲线变化,即真应力随温度升高而降低,随应变速率增大而增大。运用所建本构关系计算了22Mn B5钢在不同变形条件下的真应力,并与实验值对比,发现最大相对误差为4.26%,最大均方差为8.244 MPa。这说明所建本构关系可信度较高,可提高有限元模拟精度,能为工业生产提供借鉴。

英文摘要：

The influences of the strain, strain rate and temperature on the flow properties of high-strength steel 22MnB5 in uniaxial tensile tests were investigated under experimental temperatures of 500, 650, 700 and 800℃ and strain rates of 0.01, 0.1 and 1.0sl. The constitutive relationship of 22MnB5 steel during hot stamping was established. It is a good description way of the true stress-strain curves under unidirectional hot tensile test. That is, the true stress decreases with the increasing temperature and increases with the increasing strain rate. The true stress of 22MnB5 steel under different deformation conditions was calculated by using the constitutive relationship. Compared with the experimental values, it is found that the maximum relative error of the true stress is 4.26% and the maximum mean square error is 8.244MPa. It is illustrated that the reliability of the constitutive relationship is good. It can be used to improve the accuracy of finite element simulation and provide a reference for industrial production.