TC4钛合金高温变形时微观组织变化的计算

Microstructure evolution and modeling during isothermal deformation of TC4 titanium alloy

运用定量金相分析技术研究了TC4钛合金在高温变形过程中的微观组织演变。在此基础上 ,探索利用模糊集理论中的模糊动态线性模型描述TC4钛合金高温变形时的显微组织变化。在建立预报模型时 ,以实验测定的TC4钛合金在高温变形过程中组织参数 (α相的体积分数和尺寸 )随工艺参数 (变形温度、变形程度和变形速率 )的变化为训练样本 ,用线性回归法确定结论参数 ,获得了TC4钛合金高温变形时微观组织演变的预报模型。将训练样本及测试样本的实验结果与预报模型的计算结果进行比较 。

In this paper,a model of microstructure evolution has been established with the fuzzy set theory,according to the experimental results in microscope for the isothermal deformation of TC4 titanium alloy.In establishing the model,the microstructure change(including the volume fraction of α \|phase and the grain size)during the isothermal deformation of TC4 titanium alloy has been used to train the fuzzy model and the linear regression analysis is used to determine the resultant variables.The computed results have been verified by the results of the testing samples.