研究了两种β工艺(β退火和β锻造)下Ti-6Al-2Zr-2V-1.5Mo ELI钛合金的显微组织、室温拉伸性能和损伤容限性能。结果表明:两种β工艺下,棒材的显微组织均为不含有初生α的集束状片层组织,而β锻造棒材的α片层相对较厚;两种β工艺均可获得高的损伤容限性能,β锻造棒材的室温强度和断裂韧性较高,但β退火棒材的室温塑性、冲击韧性和疲劳裂纹扩展抗力较高。这也说明,α片层厚度的增加,可提高断裂韧性,但会降低疲劳裂纹扩展性能。 The microstructure, tensile properties at room temperature and damage tolerance of Ti-6Al-2Zr-2V-1.5Mo ELI titanium alloy under two β processes (β annealing and β forging) were studied. The results show that the microstructure of the bar is both a bundle of primary lamellae without primary α and the α lamella of the β forged bar is relatively thick under both β processes. Both β processes can obtain high At room temperature, the room-temperature plasticity, impact toughness and fatigue crack propagation resistance of β-annealed bar are higher than that of β-forged bar. This also shows that an increase in the thickness of the alpha sheet increases fracture toughness but decreases fatigue crack growth.