摘要
本文报道 Nb,Ti 微合金钢的热变形动态模拟变形抗力模型。在试验中用热加工模拟试验机进行高温压缩试验,其变形温度为1123—1423K,变形速率为0.1—60s^(-1)。结果表明,在峰值以前该钢种的流变应力数学模型为:σ=5.99.ε^(0.167)·(?)^(6.47×10^(-5)·T)·exp(4064/T)。形变激活能(Q)为444 kJ/mol,β系数为0.080。峰值应力(σ_p),临界应变(ε_c)和温度补偿应变速率参数(Z)之间的关系分别为:σ_p=12.56·lnZ-391.8;lnε_c=0.157·lnZ-7.39。
In this paper,the mathematical model of the flow stress of microalloyed steelscontaining Nb and Ti under dynamic hot deformation has been carried out by usingThermecmastor-Z simulator at deformation temperature of 1123—1423K and strain rate from0.1 to 60s-1.The results show that the dependence of the flow stress upon the hot deformationparameters is as follows:σ=5.99ε^(0.167)(?)^(6.47×10^(-5)T) exp(4064/T);activation energy(Q)is444kJ/mol;β coefficient is 0.080;meanwhile,the dependences of the peak stress ρ_p and thecritical strain ε_c on Zener Hollomon parameter(Z)have also been obtained by regressionmethods.The results are as follows:σ_p=12.56lnZ-391.8;lnε_c=0.157lnZ-7.39.
基金
国家自然科学基金
59071036
关键词
合金钢
热变形
高温试验
钛
铌
Nb
Ti microalloyed steel
hot deformation
resistance of deformation
high temperature test
