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以机械加工切削刀具材料Ti-3Al-2Fe-8V-1.5Mo钛合金为研究对象,在单相区加工锻坯,在不同温度下进行固溶+时效热处理;比较不同热处理后试样的力学性能和微观组织。结果表明:锻坯微观组织主要由β相组成,但仍存在少量晶界不连续的α相;在双相区温度下固溶,微观组织主要由长条或球状α相和亚稳态β相组成;在单相区温度下固溶,α相已全部转化为等轴的β相组织,随固溶温度升高,β相长大,晶粒尺寸变大;时效温度高于560℃时,随固溶温度升高,钛合金抗拉强度提高,塑性降低;在相同固溶条件下,随时效温度升高和时间延长,钛合金的抗拉强度降低,塑性提高。
The Ti-3Al-2Fe-8V-1.5Mo titanium alloy was machined as the cutting tool material, the forging blank was processed in single-phase zone, and the solution treatment and aging treatment were carried out at different temperatures. The mechanical properties of the samples after different heat treatments were compared And microstructure. The results show that the microstructure of the forged billet is mainly composed of β phase, but there is still a small amount of α phase with discontinuous grain boundaries. The microstructure of the forged billet is mainly composed of elongated or spherical α phase and metastable β phase . When the α phase is transformed into the β-phase structure with equiaxed phase, as the solution temperature increases, the β phase grows and the grain size becomes larger. When the aging temperature is higher than 560 ℃, With the increase of solution temperature, the tensile strength of titanium alloy increases and the plasticity decreases. With the increase of aging temperature and time, the tensile strength of titanium alloy decreases and the plasticity increases with the same solution treatment.