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采用Gleeble-1500D热力模拟试验机对铸态AZ31B镁合金圆柱试样进行了宽范围变形条件下的热压缩试验,拟合热压缩试验数据,针对镁合金应变软化特性建立了一种新的热力本构模型;依托于Deform-3D对镁板的实际热轧过程进行了热力仿真分析,依据轧制理论假设、宏观连续介质力学以及热力学原理,采用数学解析的方法建立了镁板热轧制区域中的应变、应变速率值分布模型以及三维温度场、应力场数学模型。研究结果表明:新建的热力本构模型预测精度较高,平均相对误差为5.1%;建立的轧制变形区域中的应变、应变速率值分布模型,温度场数学模型以及热力耦合场数学模型不仅形式简单易于为生产利用,更能精确表征中厚规格镁板热轧制过程中的热-力耦合变形机制。
A hot compression test was carried out on the as-cast AZ31B magnesium alloy cylindrical specimens with Gleeble-1500D thermomechanical simulator under a wide range of deformation conditions. The thermal compression test data were fitted to establish a new thermodynamic model for strain-softening properties of magnesium alloys According to the theory of rolling theory, macroscopic continuum mechanics and thermodynamics theory, the hot rolling process of magnesium plate was established by the method of mathematical analysis Strain, strain rate distribution model and three-dimensional temperature field, stress field mathematical model. The results show that the accuracy of the new thermal constitutive model is high and the average relative error is 5.1%. The strain and strain rate distribution model, the mathematical model of temperature field and the mathematical model of thermal coupling field are established not only in the form of Simple and easy to use for production, more accurate characterization of medium-thick magnesium plate hot-rolling process of heat-force coupling deformation mechanism.