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
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。
压缩试验
塑性功转化热
温度弹跳
thermal deformation constitutive equation
compression test
heat transformed from plastic work
temperature jumping
Abstract
Traditional and modified (with temperature jumping) 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 jumping 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.
中图分类号 TG113.25
所属栏目 物理模拟与数值模拟
基金项目 河北联合大学青年基金资助项目(z201104)
收稿日期 2013/3/13
修改稿日期 2014/1/1
网络出版日期
作者单位点击查看
备注李红斌(1979-), 男, 河北邢台人, 讲师, 硕士。
引用该论文: LI Hong-bin,TIAN Wei,ZHENG Ming-yue,XU Shu-cheng. Constructing Thermal Deformation Constitutive Equation with Temperature Jumping for Plain Carbon Steel Based on Fast Isothermal Compression Test[J]. Materials for mechancial engineering, 2014, 38(3): 102～105
李红斌,田伟,郑明月,徐树成. 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[J]. 机械工程材料, 2014, 38(3): 102～105
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【3】陈连生,狄国标,张洪波,等.低碳含铌钛双相钢的塑性变形抗力模型［J］.塑性工程学报,2007,5(6):820-823.
【4】湛利华,李杰,黄明辉,等.2524铝合金的蠕变时效行为及本构方程 ［J］.机械工程材料, 2013,37(5):92-96.
【5】何建洪,孙勇,段永华,等.铅镁铝合金热压缩变形条件对流变应力的影响及其本构方程的建立［J］.机械工程材料, 2013,37(3):95-98.
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【7】徐秉业, 陈森灿. 塑性理论简明教程［M］.北京: 清华大学出版社, 1981.
【8】牛济泰.材料和热加工领域的物理模拟技术［M］.北京: 国防工业出版社, 1999.
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【10】李红斌, 徐树成, 邢满江, 等.用Gleeble3500测塑性功转化热系数的研究［J］.河北联合大学学报, 2012, 34(1):10-13.
【11】LIAO Shu-lun, ZHANG Li-wen, YUE Chong-xiang, et al. Research on thermal deformation behavior and model of flow stress of GCr15 steel［J］.Journal of Materials Engineering, 2008(4):8-14.
【12】KAI K, KOPP R. Model for integrated process and microstructure simulation in hot forming［J］.Steel Research, 1992,63(6):247-256.
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