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采用热模拟实验研究了变形参数(应变量、变形温度、应变速率)对Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金微观变形组织的影响。研究结果表明,在应变量逐渐增加的热压缩变形过程中,一定变形量后开始出现层片弯曲、折曲或破碎,随着应变量的增加,动态再结晶形成的等轴晶粒增多,残余层片团减少。变形温度对钛铝合金的变形组织有着显著影响,提高热变形温度,有利于合金中的动态再结晶以及变形组织的均匀化,降低残余层片团的体积分数。较低的应变速率能促进变形时的动态再结晶,有利于提高变形组织的均匀性。还对-γTiAl合金动态再结晶新晶粒形成过程进行了讨论。
The effects of deformation parameters (strain, deformation temperature and strain rate) on microstructure of Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy were investigated by means of thermal simulation. The results show that in the process of hot compressive deformation with gradually increasing amount of strain, bending, bending or breaking of ply began to occur after a certain amount of deformation. As the amount of strain increased, the equiaxed grains formed by dynamic recrystallization increased, Laminates reduced. Deformation temperature has a significant effect on the deformation of titanium-aluminum alloy. Increasing the heat distortion temperature is conducive to the dynamic recrystallization in the alloy and the homogenization of the deformed structure and the volume fraction of the residual lamella. The lower strain rate can promote the dynamic recrystallization during deformation and help to improve the uniformity of the deformed structure. The formation of new grains during dynamic recrystallization of -γTiAl alloy was also discussed.