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通过引入动态再结晶的演化速率,分析了基于Avrami方程的经典动态再结晶动力学模型的不足.提出了一种新的具有单参数的动态再结晶动力学模型,反映了动态再结晶过程缓慢快速缓慢的特点.采用Gleeble-1500热模拟试验机,对典型的具有动态再结晶特性的材料镁合金AZ31B进行了热压缩实验,通过进行参数回归得到了其动态再结晶动力学模型,并与实验结果相对比,验证了该模型的正确性.进一步将稳态变形条件下获得的微观组织演化模型改写成分步叠加形式.与动态再结晶晶粒尺寸模型相结合,应用到非隐态条件的晶粒预测,模拟与实验的对比表明计算结果和定量金相法所获得的结果基本一致,说明了非稳态变形过晶粒的叠加预测方法的合理性.
By introducing the dynamic recrystallization evolution rate, the deficiency of classical dynamic recrystallization kinetics model based on Avrami equation is analyzed. A new kinetic recrystallization kinetic model with single parameter is proposed, which shows that the dynamic recrystallization process is slow and fast The characteristics of dynamic recrystallization of AZ31B, a typical magnesium alloy with dynamic recrystallization, were investigated by means of Gleeble-1500 thermal simulation tester. The kinetic recrystallization kinetics model was obtained by regression analysis. The experimental results The correctness of the model is verified.The microstructure evolution model obtained under steady-state deformation is rewritten into stepwise superposition form.With the dynamic recrystallization grain size model, The comparison of prediction, simulation and experiment shows that the calculated results are basically consistent with the results obtained by quantitative metallographic method, which shows the rationality of the superposition prediction method of unsteady deformed grains.