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通过对低成本Ti-6Al-2.5V-1.5Fe-0.15O合金热模拟压缩试验,得到了合金在不同高温变形条件下的真应力-应变曲线。结果表明,在β单相区应力-应变曲线呈现动态回复特征,在α+β两相区呈现典型动态再结晶曲线特征。变形组织由α相以及少量的β相构成,层片α相发生球化,随着变形温度升高,球化率降低,再结晶晶粒长大。在低应变速率变形时,流变应力软化机制以α相动态球化为主,高应变速率变形时除了球化外,片状α相周围有细小的再结晶晶粒形成。
The true stress-strain curve of the alloy under different high temperature deformation conditions was obtained through the thermal simulation of the low-cost Ti-6Al-2.5V-1.5Fe-0.15O alloy. The results show that the stress-strain curve of β single phase shows a dynamic recovery characteristic, and shows the typical dynamic recrystallization curve in the α + β two-phase region. The deformed microstructure consists of α phase and a small amount of β phase. The α phase of the lamellae is spheroidized. With the increase of deformation temperature, the spheroidization rate decreases and the recrystallized grains grow up. At low strain rates, the softening mechanism of flow stress is dominated by α-phase dynamic spheroidization. In addition to spheroidization at high strain rates, fine recrystallized grains are formed around the α-phase.