The hot compression test was carried out for the Ti-25V-15Cr-0.2Si alloy

and the constitutive equation and dynamic recrystallization mathematical model were established based on the experimental data.The microstructure transformation of Ti-25V-15Cr-0.2Si alloy during thermal deformation was quantified and visualized by Deform-3D finite element software.The results indicate that the dynamic recrystallization volume fraction Xdynis increased and the average grain size davgis decreased continuously with the strain increase under the deformation conditions of 1 050 ℃

0.001 s

-1

.When the strain reaches 0.92

the davgis 58.62μm

and the relative error is within 10% compared with the experimental data.The overall morphology of the test and simulation microstructure keeps similiar from the strain amount of 0.51

indicating that the deformation begins to enter a stable deformation stage.Through the simulated microstructure observation of the alloy under different deformation conditions

it is found that the dynamic recrystallization can be accelerated and the average grain size is refined at a given deformation temperature by reducing the strain rate.while both dynamic recrystallization occurrence and the growth of recrystallized grains can be promate by increasing the temperature with the constant strain rate.Compared with the metallographic microstructure

it can be seen that the change law of the simulated microstructure is well agreement with the evolution law of the metallographic microstructure.