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采用Gleeble热压缩试验建立了真空自耗法制备φ220 mm TiAl合金铸锭的高温变形本构方程,将该本构方程嵌入Deform-3D软件后对不同工艺条件下TiAl合金铸锭的热挤压过程进行了数值模拟,获得了在不同模具锥角及不同挤压速度下棒材内的等效应变场、温度场,得出70%变形量下TiAl合金最佳的挤压工艺。研究发现,模具锥角对棒材等效应变场、温度场和均匀变形区尺寸均有较大影响;而挤压速度对棒材等效应变场影响不大,但对棒材的温度场有显著影响。
The high temperature deformation constitutive equation of φ220 mm TiAl alloy ingot prepared by vacuum consumable method was established by using Gleeble hot compression test. The constitutive equation was embedded in Deform-3D software and the hot extrusion process of TiAl alloy ingot under different technological conditions The numerical simulation was carried out and the equivalent strain field and temperature field in the bar with different mold taper angles and different extrusion speeds were obtained. The optimum extrusion process was obtained for the TiAl alloy with 70% deformation. The results show that the die taper angle has a significant effect on the equivalent strain field, temperature field and uniform deformation zone size of the bar, while the extrusion speed has little effect on the equivalent strain field of the bar. However, Significantly affected.