Effect of Rolling Process on Microstructure and Properties of TC4 Titanium Alloy Plate

In order to establish and optimize the rolling process of TC4 titanium alloy plate with moderate thickness and develop the TC4 titanium alloy plate with excellent comprehensive mechanical properties,the rolling industrial test of TC4 titanium alloy plate with moderate thickness was carried out in a company based on the characteristics of 4 300 mm hot rolling equipment.The effects of rolling temperature and pass deformation on microstructure and mechanical properties of the TC4 titanium alloy plate were studied.The results show that in the（α + β） two-phase region,the grain size of TC4 titanium alloy plate decreases continuously while the strength,plasticity and toughness of the plate gradually increase with decrease in the rolling temperature.As the pass deformation decreases,the microstructure of the surface and core of the plate trends to be more uniform,and the plasticity and toughness are significantly improved.After annealing（850 ℃×2 h,AC） treatment,the homogeneity of TC4 titanium alloy plate with moderate thickness can be improved obviously,realizing a well match during the strength,plasticity and toughness.