Grain growth behavior of Ti-1300 alloy

Grain growth behavior and its kinetics during the solution treatment process of Ti-1300 alloy have been investigated. The results show that the insoluble α leads to slight variation of grain size below the β transus temperature of Ti-1300 alloy, and the grain growth become rapid above the β transus temperature of Ti-1300 alloy. The grain growth kinetics at temperatures from 840 to 950℃ indicates that the variation of average β grain size with solution temperature in Ti-1300 alloy obeys the following relationship: D=1.13×10¹⁰exp(-2.1×10⁴/T). The activation energy value for grain growth in Ti-1300 alloy is 350 kJ/mol. It means that the grain growth mechanism is a self-diffusion-controlling process. When solution treated at 840, 870 and 900℃, the grain growth exponents (η) are 0.31, 0.55 and 0.56, respectively. The values of η increase with the raise of solution temperature.