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为研究新型T91稀土钢的热力学性能,采用Gleeble-1500D热模拟试验机测定变形温度θ为1100~1250℃、ε觶为0.5~5 s-1时的应力-应变曲线,并采用Zener-Hollomon参数法构建该钢不同条件下高温塑性变形的本构方程。结果表明:在高变形温度及低应变速率时,测定的T91稀土钢应力-应变曲线呈双峰特征,有动态再结晶现象产生。随变形温度升高及应变速率的降低,动态再结晶现象越易发生;应变速率越小,流变应力下降越明显。T91钢的热变形激活能为509.04k J·mol-1。
In order to study the thermodynamic properties of the new T91 rare earth steel, the stress-strain curves of the T91 rare earth steels were obtained by using the Gleeble-1500D thermal simulation tester with the deformation temperature θ of 1100-1250 ℃ and the ε 觯 of 0.5-5 s -1. The Zener-Hollomon parameters Law to construct the constitutive equation of high temperature plastic deformation of the steel under different conditions. The results show that at high deformation temperature and low strain rate, the stress-strain curve of T91 rare earth steel shows bimodal characteristics with dynamic recrystallization. With the increase of deformation temperature and the decrease of strain rate, the dynamic recrystallization is more likely to occur. The smaller the strain rate, the more obvious the drop of flow stress. T91 steel thermal deformation activation energy of 509.04k J · mol-1.