Abstract:The microstructure of Ti-1500 alloy in three different deformation zones at different hot upsetting temperatures was comparatively analyzed through hot upsetting experiments. The experimental results show that the hot upsetting process has a significant influence on the microstructure evolution, and the higher the hot upsetting temperature and the larger the deformation, the more obvious the regional dynamic recrystallization is. Specifically, dynamic recrystallization did not occur in deformation zone I and deformation zone II at 700 ℃, but obvious recrystallization occurred in deformation zone III, α→β phase transformation occurred at 820 ℃ and obvious dynamic recrystallization occurred in all three deformation zones, and the recrystallized grains grew excessively at 900 ℃. When upsetting at 700 ℃, the {001}//ND texture was formed in the deformation zone I. With the increase of deformation, the grains in the deformation zone II gradually turned in the directions of <001> and <111>, and finally the {001} texture with higher strength and more volume fraction was formed and a part of the {111}//ND texture was formed. When the deformation amount increased to the deformation zone III, During grain growth, the grain boundaries of <001> oriented grains migrate to those of <111> oriented grains, which leads to the further increase of {001} texture strength and volume fraction, while the volume fraction of {111} texture decreases, and the texture type, texture strength and texture evolution law at 820 ℃ and 900 ℃ are consistent with those at 700 ℃.