一种基于并联关系模型的TC4合金本构方程

NEW CONSTITUTIVE EQUATION BASED ON PARALLEL MODEL FOR Ti-6Al-4V ALLOY

以 TC4合金流动应力σ为目标函数 ,通过热态物理模拟试验 ,系统地研究了主要锻造热力参数 (变形温度、变形速度和变形程度等 )对目标函数的影响 ,基于数理统计学原理 ,科学地分析并回归出了能综合反映锻造热力参数对材料成形性能影响的本构方程 ,得出了 TC4合金变形工艺参数 (变形温度 T、等效应变速率ε.、等效应变ε等 )对目标函数的影响规律 ,从而 ,为 TC4合金锻造过程的数值模拟和锻造热力参数的合理制订与控制提供了基础。

Taking the flow stress σ of Ti-6Al-4V as and objective function, the influences that forging parameters (deformation temperature, deformation rate, deformation degree) impose on the flow stress are studied systematically by the hot compressive simulation experiments, and more, based on the mathematic theory of statistics, a new constitutive equation is developed, which can reflect synthetically the influences of forging thermal parameters on material forming property; meanwhile, the influence regularities of deformation processing parameters (deformation temperature, equivalent strain rate, equivalent strain) on the objective function are generalized, therefore, a scientific basis is provided for the numerical simulation of forging process of Ti-6Al-4V alloy, as well as the rational choice and control of forging thermal parameter.