The microstructure evolution process of cast Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy during cogging process in the temperature range of 1000-1200 ℃ and strain rate range of 0.001-1.0 s-1 was studied by hot compressing testing on a Gleeble-1500 simulator.And the characteristic of deformed microstructure with different technological parameters was studied and quantized by quantitative metallography method.Based on the experimental results,the model of dynamic recrystallization volume fraction and dynamic recrystallization grain size were set up in order to predict mic...