20Mn2合金钢半挂车轴用无缝管温热本构关系

Constitutive equations of 20Mn2 seamless steel tube for trailer rear axle under warm and hot deformation

为确定温热条件下20Mn2合金钢半挂车轴用无缝管的变形行为,利用Gleeble-1500D热模拟试验机进行温热压缩实验,获得了该材料在变形温度600℃、800℃、1000℃、1200℃和应变速率0.001s-1、0.01s-1、0.1s-1、1s-1、3s-1下的真应力-应变关系。结果表明,温热变形下,金属流变应力随温度的升高而减小,随应变速率的增大而增大;通过实验数据分析确定出包含Zener-Hollomon参数的Arrhenius双曲正弦关系的本构方程,变形激活能为326.7kJ·mol-1。20Mn2合金钢本构方程的确定,为半挂车车轴成形工艺的研究提供了重要的基础技术数据。

In order to determine the deformation behaviors of 20Mn2 seamless steel tube for trailer rear axle under warm and hot conditions,the warm and hot compression tests were carried out on the Gleeble-1500 Dthermal simulation testing system,and the true stress-strain curves were obtained under different temperatures of 600℃,800℃,1000℃ and 1200℃,and with different strain rates of 0.001s^-1,0.01s^-1,0.1s^-1,1s^-1 and 3s^-1.The results showed that,under warm and hot conditions,the flow stress decreases when the temperature increases,and the flow stress increases when the strain rate increases;By analyzing the obtained experimental data,the Arrhenius constitutive equations containing Zener-Hollomon parameter of hyperbolic sine form were determined,and the deformation activation energy is Q=326.7kJ/mol.The constitutive equation of 20Mn2 alloy provides an important basic technical data for the process research of trailer rear axle.