基于高速等温压缩试验构建普碳钢考虑温度弹跳的热变形本构方程  

Constructing Thermal Deformation Constitutive Equation with Temperature Jumping for Plain Carbon Steel Based on Fast Isothermal Compression Test

作　　者：李红斌[1] 田伟[1] 郑明月[1] 徐树成[1] 

机构地区：[1]河北联合大学冶金与能源学院河北省现代冶金技术重点实验室,唐山063009

出　　处：《机械工程材料》2014年第3期102-105,108,共5页Materials For Mechanical Engineering

基　　金：河北联合大学青年基金资助项目(z201104)

摘　　要：采用Gleeble3500型热模拟试验机,通过高速等温压缩试验所得的流变应力曲线以及温度变化曲线构建了传统热变形本构方程和考虑温度弹跳的热变形本构方程,并将它们与实测值进行对比,研究了普碳钢在热压缩变形过程中的温度弹跳以及其对构建本构方程精确度的影响。结果表明:在高速压缩过程中,由塑性功导致的温度弹跳使温度已严重偏离设定值,由塑性功转化热造成的温升与真应变呈线性关系,线性系数与设定的变形温度有关;构建的考虑温度弹跳的热变形本构方程比传统热变形本构方程的预测精度更高。Traditional and modified （with temperature iumping） thermal deformation constitutive equations were constructed by flow stress curves and temperature curve obtained from fast isothermal compression test based on Gleeble3500 thermal simulation tester, and the measured results were compared with the results obtained by the constitutive equations. The temperature jumping of plain carbon steel during thermal compression and the effect of temperature jumping on precision of the constitutive equation were studied. The results show that the temperature iumping caused by plastic work deviated from the given values, and the temperature raised caused by heat trasformed from plastic work was linear ship with the ture strain, and the linear coefficient was connected with the given deformation temperature during the fast compression. The precipitated accuracy of the constitutive equations with temperature jumping was higher than that of the traditional constitutive equation.

关 键 词：热变形本构方程 压缩试验 塑性功转化热 温度弹跳 

分 类 号：TG113.25[金属学及工艺—物理冶金]