固溶时效处理对TB9钛合金棒材组织与性能及其弹簧弹性的影响

摘要

TB9钛合金弹簧具有比强度高、耐蚀性优良和抗疲劳性好等优点,已在汽车工业及航空航天领域中得到应用.通过不同的固溶-单级时效处理制度对TB9钛合金进行处理,研究了其对TB9钛合金棒材组织与性能及弹簧弹性的影响.结果表明,经800℃×30 min/AC +510 ℃ × 16 h/AC固溶时效处理的TB9钛合金棒材具有良好的综合力学性能.随着时效时间的延长,合金析出相的尺寸和数目有较大的变化,析出相的非均匀性随时效时间的增加而消除,同时晶粒明显细化,平均粒径在20 μm左右.固溶时效处理对TB9钛合金弹簧的压缩弹力有较大影响,弹簧经过800℃×30 min/AC+510℃×16 h/AC的固溶时效处理后获得良好的弹性.%With the high specific strength, corrosion and fatigue resistance, TB9 titanium alloy spring has been used in the area of automotive, aviation and aerospace. The effect of different solution and single aging treatment systems on microstructure and properties of TB9 titanium alloy and elasticity of its spring was studied. The results show that a good performance of TB9 titanium alloy is obtained by the solution and aging treatment (800 °C ×30 min/AC +510°C ×l6 h/AC). The size and number of precipitation phase changed with the aging temperature and aging time. Heterogeneity of precipitation phase is eliminated with increasing aging time and the grain size is refined to 20 μm. Solution and aging treatment has major effect on compression elasticity of TB9 titanium spring. After solution and aging treatment ( 800 °C ×30 min/AC +510 °C×16 h/AC) the spring has better elasticity.