Abstract: Effect of cooling method in solution treatment on microstructure and mechanical properties of the hot-rolled plate of a new type of short-term servicing high-temperature titanium alloy was studied. The results show that the microstructure of the tested titanium alloy plate is all α+β phases after solution treatment and cooling in different ways. The size of secondary α phases under all the three cooling methods is small, but the number of secondary α phases under furnace cooling is less than that of the other two cooling methods. The size and quantity of the secondary α phases under air cooling and water cooling are similar. With the increase of cooling rate, the strength of the alloy at room temperature, 600 ℃ and 700 ℃ increases, while the plasticity decreases. The titanium alloy can obtain excellent comprehensive mechanical properties by air cooling in solution treatment.

Key words: short-term servicing high-temperature titanium alloy, solution treatment, cooling method, microstructure, mechanical properties