The double hot compression simulation of TB8 titanium alloy was carried out on the thermal simulation machine to understand effects of deformation temperature and strain rate of double hot compression on microstructure.The results show that

there exists equiaxed structure after obvious dynamic recrystallization with hot deformation in single phase region at 845 ℃.Grain size is refined obviously after deformation.Recrystallization content is decreased and brokenβgrain boundary can be observed with the increase of strain rate.The microstructure presents inhomogeneous deformation in dual phase region at 805 ℃

and large number of brokenαphase with poor uniformity can be observed.The change of microstructure can be ignored with increasing in strain rate with presence of banded structure.There exists equiaxed structure and banded structure after hot deformation crossing single phase region to dual phase region.Deformation temperature is more sensitive to strain rate of banded structure.