(西部超导材料科技有限公司，西安 710012)
摘 要: 为了提高国产SP-700钛合金的性能，对SP-700钛合金热处理的工艺进行研究。采用不同固溶温度、时效温度以及时效时间的处理方法，分析热处理工艺对该钛合金组织和性能的影响。研究结果表明：钛合金强度随着固溶温度的升高而提高，其原因是次生α相的析出量增加；控制时效温度和时效时间，可以控制次生α相的形状和尺寸，从而能获得强度和塑性的最佳匹配；于850 ℃进行固溶处理并采用水冷，然后，在510 ℃或550 ℃时效可使SP-700钛合金获得较好的强度−塑性匹配。
关键字: SP-700钛合金；固溶处理；时效处理；次生α相
SP-700 titanium alloy
（Western Superconducting Technologies Co., Ltd., Xi’an 710012, China）
Abstract:The heat treatment of SP-700 titanium alloy was studied to improve the property of homemade SP-700 titanium alloy. By using different solutions and aging temperatures as well as aging time, the effects of heat treatment process on microstructure and properties of SP-700 titanium alloy were systematically studied. The results show that the alloy strength increases with solid solution temperature due to the fact that the number of secondary α increases. To control aging temperature and aging time can control the shape and size secondary α, to obtain the optimum combination of strength with plasticity. Solution treating at 850 ℃, cooling to room temperature by water, and then aging at 510 ℃ or 550 ℃ will help the alloy to obtain the optimum combination of strength with plasticity.
Key words: SP-700 titanium alloy; solution treatment; aging treatment; secondary α phase
