The true stress-true strain curve of Fe-3.0%Si-0.09%Nb oriented silicon steel was tested by thermal simulator at different deformation temperatures and strain rates.The influence of deformation parameters on flow stress was analyzed.The thermal deformation stress exponent n and deformation activation energy Q were calculated and the flow stress constitutive equation was established by linear-regression analysis.The results show that the true stress-true strain curve of the oriented silicon steel was a type of dynamic recovery,and the flow stress during deformation mainly depended on the deformation temperature and strain rate.When the strain rate was constant,the flow stress decreased with the increase of deformation temperature and the flow stress increased with the increase of strain rate when the deformation temperature was constant.The flow stress calculated by the constitutive equation of flow stress of Fe-3.0%Si-0.09%Nb oriented silicon steel was in good agreement with that measured by the test.%通过热模拟试验机测定了Fe-3.0%Si-0.09%Nb取向硅钢在不同变形温度和应变速率下的真应力-真应变曲线,分析了变形参数对流变应力的影响规律,通过线性回归分析计算出该取向硅钢的热变形应力指数n以及变形激活能Q,并构建了流变应力本构方程.结果表明:该取向硅钢的真应力-真应变曲线为动态回复型,其变形时的流变应力主要取决于变形温度和应变速率;当应变速率一定时,流变应力随着变形温度的升高而减小;变形温度一定时,流变应力随着应变速率的增大而增大;用构建的Fe-3.0%Si-0.09%Nb取向硅钢流变应力本构方程计算得到的流变应力与通过试验测得的结果相吻合.
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