固溶温度对TA19钛合金组织及性能的影响

Influence of Solution Temperature on Microstructures and Mechanical Properties of TA19 Titanium Alloy

采用5种不同固溶温度和相同时效温度的热处理制度对TA19钛合金进行固溶时效处理,研究不同固溶温度对显微组织和力学性能的影响。结果表明,固溶温度对TA19钛合金显微组织的初生α相含量影响显著;经相变点以下10℃到50℃固溶保温1 h后风冷,再经595℃时效保温8 h后空冷,获得的室温和高温力学性能均能满足AMS 4975标准的要求;固溶温度选择相变点以下10℃时,TA19钛合金的室温和高温力学性能及蠕变性能匹配最好,对应的显微组织中初生α相含量为15%~18%。

The effects of different solution temperatures on the mierostructures and mechanical properties of TA19 titanium alloy were studied by means of heat treatment at different solution temperatures and the same aging temperature. The results showed that the so- lution temperature had a significant effect on the content of primary a phase of TA19 titanium alloy microstructure. When TA19 titani- um alloys were solution treated by at 10 ℃ to 50℃ bellow Tβ for 1 h, blowing cooling and then were aged at 595℃/8 h, air cooling, their room temperature and high temperature mechanical properties could meet the requirements of AMS 4975 standard. The overall properties of TA19 titaniam including mechanical properties at room and high temperatures and creep properties were the best when the alloy was treated by Tβ - 10 ℃/1 h, blowing cooling ＋595 ℃/8 h, air cooling, and then its content of primary α phase was 15% - 18%.