锻压技术

铸态P91耐热合金钢高温流变行为及本构方程

英文标题：High temperature rheological behavior and constitutive equation of as-cast heat-resisting alloy steel P91

作者：邓馗李永堂付建华刘强

单位：太原科技大学

分类号：TG142.73；TG376

出版年,卷(期):页码：2015,40(11):100-106

摘要：

为了研究铸态P91耐热合金钢的高温变形流变特性，建立铸态P91耐热合金钢高温流变应力本构方程，采用Gleeble-3500热模拟实验机对铸态P91耐热合金钢进行等温热压缩实验，研究了变形温度为900~1200 ℃、应变速率为0.01~5 s-1、变形量为60%条件下的热变形行为。研究结果表明，随着变形温度的升高和应变速率的降低，动态再结晶现象越容易发生，流变应力显著降低，曲线由加工硬化型向动态回复及动态再结晶型转变。在双曲正弦修正的Arrhenius型方程及Zener-Hollomon参数的基础上，考虑真应变对流动应力的影响，建立了铸态P91耐热合金钢的流变应力模型及本构方程。误差分析表明，所建立的本构方程具有良好的精度。

To study the high-temperature deformation rheological behavior of the as-cast heat-resisting alloy steel P91, its high-temperature rheological stress constitutive equation was established and its isothermal compression experiment was done by the Gleeble-3500 thermal simulation testing machine. Then, the heat deflection behavior was investigated under the condition of the deflection temperature 900-1200 ℃, the strain rate 0.01-5 s-1, and deformation 60%. Results show that with the increase of the deformation temperature and the decrease of the stress rate, the possibility of dynamic recrystallization increases and the flow stress decreases substantially. And the curves transform from work hardening to dynamic recovery and dynamic recrystallization. Based on the sine-hyperbolic Arrhenius equation and the Zener-Hollomon parameters, the impact of true strain on flow stress was considered. The flow stress model and constitutive equation of the as-cast state heat resistant alloy steel P91 were proposed. Error analysis demonstrates that the proposed constitutive equation has a good accuracy.

基金项目：

国家自然科学基金资助项目（51135007）

邓馗（1989-），男，硕士研究生

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