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研究双重退火时不同退火温度对BT25钛合金组织与力学性能的影响。结果表明:双重退火后的室温和高温拉伸性能都强于单一退火,具有良好的综合性能。双重退火时,随着第1退火温度的提高,初生等轴α相含量减少,颗粒逐渐增大,次生α相增多增大;合金的强度降低,塑性及韧性提高。随着第2退火温度的升高α颗粒尺寸稍有增大,球化程度进一步提高;合金强度、塑性及韧性变化不大,高温性能稳定。BT25钛合金采用(940~980)℃×1 h,空冷+(530~570)℃×6 h,空冷的双重退火工艺时,可得到较理想的显微组织和良好的综合性能。
The effects of different annealing temperatures on the microstructure and mechanical properties of BT25 titanium alloy during double annealing were investigated. The results show that the tensile properties at room temperature and high temperature after double annealing are better than single annealing and have good comprehensive properties. With the increase of the first annealing temperature, the content of primary equiaxed α phase decreases, the particles increase and the secondary α phase increases. The strength of the alloy decreases and the plasticity and toughness increase. With the increase of the second annealing temperature, the particle size of α increased slightly and the degree of spheroidization increased further. The strength, ductility and toughness of the alloy did not change much, and the high temperature performance was stable. BT25 titanium alloy with (940 ~ 980) ℃ × 1 h, air cooling (530 ~ 570) ℃ × 6 h, air cooling double annealing process, you can get the ideal microstructure and good overall performance.