Cr9Mo高合金钢的热流变应力本构方程
Thermal Flow Stress Constitutive Equation of Cr9Mo High-alloy Steel
摘 要
采用Gleeble-1500D型热模拟试验机对Cr9Mo高合金钢进行热压缩变形,研究了该钢在温度1 173~1 473 K和应变速率10-3~1 s-1条件下的热塑性变形行为;并基于经典的应力-位错关系和动态再结晶动力学理论,分别建立了Cr9Mo钢的加工硬化-动态回复和动态再结晶两阶段的流变应力本构方程.结果表明:所建立的两个阶段的流变应力本构方程与试验曲线吻合较好,可以用该方程来预测Cr9Mo钢的高温流变行为.
动态回复
动态再结晶
流变应力模型
Cr9Mo high alloy steel
dynamic recovery
dynamic recrystallization
flow stress models
Abstract
The hot compressive experiment of Cr9Mo high-alloy steel was carried out on Gleeble-1500D thermo-simulation machine.The hot plastic behavior of the steel was investigated at temperatures ranging from 1 173 to 1 473 K and strain rates from 10-3-1 s-1.Based on the theory of the classical stress-dislocation relation and the kinematics of the dynamic recrystallization,the flow stress constitutive equations in the work hardening-dynamical recovery stage and dynamical recrystallization stage were established for Cr9Mo steel,respectively.The stress-strain curves of Cr9Mo steel predicted by the established models were in basic agreement with experimental results,indicating that the equation could predict the high temperature rheological behevior.
中图分类号 TG142
所属栏目 试验研究
基金项目 国家“973”计划资助项目(2006CB705401)
收稿日期 2008/9/4
修改稿日期 2009/6/20
网络出版日期
作者单位点击查看
备注周滨(1980-),男,河南洛阳人,博士研究生.
引用该论文: ZHOU Bin,SHEN Yu,CHEN Jun,CUI Zhen-shan. Thermal Flow Stress Constitutive Equation of Cr9Mo High-alloy Steel[J]. Materials for mechancial engineering, 2009, 33(9): 17～20
周滨,申昱,陈军,崔振山. Cr9Mo高合金钢的热流变应力本构方程[J]. 机械工程材料, 2009, 33(9): 17～20
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参考文献
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【2】LAASRAOUI A,JONAS J J.Prediction of steel flow stresses at high temperatures and strain rates[J].Metallurgical Transactions A (Physical Metallurgy and Materials Science),1991,22(7):1545-1558.
【3】HERNANDEZ C A,MEDINA S F,RUIZ J.Modeling austenite flow curves in low alloy and microalloyed steels[J].Acta Materialia,1996,44(1):155-163.
【4】JONAS J J.Back stress in high temperature deformation[J].Acta Metallurgica,1969,17(4):397-405.
【5】ROBERTS W.Deformation,Processing and Structure,ASM[M].Ohio:Metals Park,1984.
【6】MCQUEEN H J,YUE S,RYAN N D.Hot working characteristics of steels in austenitic state[J].Journal of Materials Processing Technology,1995,53(1/2):293-310.
【7】MEDIAN S F,HERNANDEZ C A.General expression of the Zener-Hollomon parameter as a function of the chemical composition of low alloy and microalloyed steels[J].Acta Materialia,1996,44(1):137-148.
【8】KARHAUSEN K,KOPP R.Model for integrated process and microstructure simulation in hot forming[J].Steel Research,1992,63(6):247-256.
【9】MECKING H,KOCKS U F.Kinetics of flow and strain-hardening[J].Acta Metallurgica,1981,29(11):1865-1875.
【10】KONG L X,HODGSON P D,WANG B.Development of constitutive models for metal forming with cyclic strain softening[J].Journal of Materials Processing Technology 1999,89/90:44-50.
【11】WAHABI M E,CABRERA J M,PRADO J M.Hot working of two AISI 304 steels:a comparative study[J].Materials Science and Engineering A,2003,343(1/2):116-125.
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