通过采用不同的热处理制度研究了时效温度和β退火温度对Ti-55531合金显微组织和力学性能的影响。结果表明： Ti-55531合金固溶加时效处理后可获得初生α相呈长条或等轴状的组织，β基体上大量析出的次生α相使其获得较高的强度，且强度随时效温度升高而显著降低，延伸率变化不明显，断面收缩率在620℃以上随着时效温度升高有所增加，但该组织状态断裂韧度偏低；β退火后可获得均匀的片状组织，具有较高的断裂韧性，抗拉强度在600～650℃之间随退火温度升高呈线性关系降低，可根据需要很方便地调整强度级别，塑性随退火温度升高变化不太明显。
The influence of aging and βannealing temperatures on microstructure and mechanical properties of Ti-55531 titanium alloy were studied .The results show that the microstructure with strip or equiaxed primary αphase can be obtained by solution aging heat treatment .The ultimate strength remains at a high level because of a large num-ber of secondary αphase .With increasing aging temperature , strength of Ti-55531 titanium alloy decreases obviously , while above 620 ℃, reduction of area increases gradually , but the fracture toughness is relatively low . Lamellar structure can be obtained by βannealing .Under this condition the fracture toughness is relatively high , and strength linearly decreases when annealing temperature changes from 600 ℃to 650 ℃, which is easy to adjust strength level , while the ductility property is not sensitive with the variety of annealing temperature .
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