钛合金热等静压模拟本构关键参数确定及工艺优化

Determine key parameters of simulation constitutive and process optimization for titanium alloy(Ti-6Al-4V) hot isostatic pressing

对钛合金粉末热等静压进行数值模拟,以预测材料的成形性能;采用本构为MSC.Marc软件中嵌入的Shima模型,通过对该数值模型的分析;制定了本构模型中TC4材料模拟所需材料参数的测定方法。针对航空类典型环形零件的成形,应用数值模型,通过对多种不同工艺制度参数的对比,得到了热等静压过程中的关键参数压力、温度曲线的优化制度。利用热等静压制备了实际的环形样件,数值模拟与试验结果吻合较好,说明数值模拟可对零件的热等静压工艺过程进行预测,同时也为复杂零件的成形预测奠定了基础。

Numerical simulation of titanium alloy powder during HIP with Shima model was studied.Material parameters of the model were determined based on uniaxial compression test.A titanium alloy ring sample was formed by HIP.The optimization of pressure and temperature were carried on.The optimal parameters during hot isostatic pressing were found by numerical simulation.The sample was analyzed by using Shima model in the platform of MSC.Marc with the determined characteristics of titanium alloy（Ti-6Al-4V）.The results of simulation are in good agreement with that of experiment which shows the model can be used to predict deformation during HIP and also it lays the foundation for the prediction of more complex parts.