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采用冷轧方法,通过设计不同的变形率和退火温度,研究了Ti-3Al-2.5V钛合金管材的显微组织和力学性能,探索了该合金的一种高强高韧管材的制备工艺。结果表明,当退火温度低于550℃时,Ti-3Al-2.5V合金管的再结晶程度相当低;当退火温度达700℃时,管材发生完全再结晶。合金管材力学性能的剧烈变化集中在退火温度为550～650℃之间。经工艺优化,当变形率为51.1%且退火制度为550℃×90min,或者变形率为68.5%～80.2%且退火制度为600℃×90min时,Ti-3Al-2.5V合金管材的抗拉强度≥862MPa,屈服强度≥724MPa,伸长率≥12%。
The microstructure and mechanical properties of Ti-3Al-2.5V titanium alloy tube were studied by means of cold-rolling method by designing different deformation rates and annealing temperatures. The preparation technology of a high-strength and high-toughness tube was explored. The results show that when the annealing temperature is lower than 550 ℃, the recrystallization degree of Ti-3Al-2.5V alloy tube is quite low. When the annealing temperature reaches 700 ℃, the tube recrystallizes completely. The dramatic changes in the mechanical properties of the alloy pipe focus on the annealing temperature between 550 ~ 650 ℃. Through the process optimization, the tensile strength of Ti-3Al-2.5V alloy pipe when the deformation rate is 51.1% and the annealing system is 550 ℃ × 90min, or the deformation rate is 68.5% ~ 80.2% and the annealing system is 600 ℃ × 90min ≥862MPa, yield strength ≥724MPa, elongation ≥12%.