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

作　　者：张亚[1] 徐春国[1] 郭永强[1] 熊建江 赵培峰[3] 

机构地区：[1]北京机电研究所,北京1100083 [2]南昌齿轮有限责任公司,南昌330000 [3]河南科技大学材料科学与工程学院,洛阳471023

出　　处：《塑性工程学报》2015年第3期32-37,共6页Journal of Plasticity Engineering

基　　金：国家高技术研究发展计划(863)资助项目(2012AA040202)

摘　　要：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.

关 键 词：20Mn2合金钢 半挂车车轴 本构方程 ZENER-HOLLOMON参数 

分 类 号：TG113[金属学及工艺—物理冶金] TP183[金属学及工艺—金属学]