固溶冷却方式对短时用高温钛合金板材组织和性能的影响

研究了固溶冷却方式对一种新型短时用高温钛合金热轧板材显微组织和力学性能的影响。结果表明,新型短时用高温钛合金板材经固溶处理及不同方式冷却+时效后,合金的组织均为α+β相,随着冷却速率的增加,初生α相的含量和尺寸逐渐减小,3种冷却方式下析出的次生α相尺寸都较细小,但炉冷析出的次生α相数量较少,空冷和水冷析出的次生α相尺寸和数量相差不大。随着冷却速率的提高,合金的室温、600 ℃及700 ℃高温强度提高而塑性降低。合金固溶处理后采用空冷方式可获得较好的综合力学性能。

Effects of solution cooling method on microstructure and properties of short-term servicing high-temperature titanium alloy plate

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.