时效工艺对TB3钛合金丝材组织及力学性能的影响

Effect of Aging Process on Microstructure and Mechanical Properties of TB3 Titanium Alloy Wire

研究了双重时效、单重时效工艺对?3.9 mmTB3钛合金丝材组织及力学性能的影响。结果表明:TB3钛合金丝材在(α+β)/β转变温度以上固溶处理并经双重时效处理时,随二次时效温度升高,合金强度降低而塑性提高,时效析出的α相变得粗化且分布不均匀;经520~550℃单重时效处理16 h时,随时效温度升高,合金强度降低而塑性升高;与双重时效处理相比,单重时效的合金强度高而塑性略有降低,α相数量增加且分布更为均匀。

The effects of double aging and single aging on the microstructures and mechanical properties of 3.9 mm in diameter TB3 titanium alloy wire were studied. The results indicate that after solution treatment above the transition temperature （α＋β）/β and the double aging treatment, with increase of the second aging temperature, the strength of TB3 titanium alloy decrease and the plasticity increase, α phase precipitated become more coarse and distribute unevenly. After single aging treatment at 520-550℃ for 16 h, the strength of the alloy decreases and the plasticity increases with increase of aging temperature. Compared with the double aging treatment, the strength of the alloy is increased and the plasticity is decreased slightly after single aging treatment, while the number of precipitate phase is increased and distributed more uniformly.