热变形参数对TC11合金微观组织的影响

Influence of Deformation Parameters on Microstructure of TC11 Alloy

在Gleebe-1500型热模拟试验机上进行了TC11合金在变形温度1023～1233K、应变速率0.001～10.0s-1、变形程度30%～70%时的热模拟压缩试验。结果表明,在α+β两相区变形时,变形温度对初生α相晶粒尺寸有影响;高应变速率下变形时,在一定的变形温度下合金内部将发生动态再结晶,且随变形程度增大,再结晶温度逐渐降低。同时,应变速率、变形程度和变形温度对合金动态再结晶发生的影响逐渐减小;确定了合金发生动态再结晶的最佳变形参数是在应变速率1.0 s-1附近,变形程度约50%,变形温度1123～1213K。

Isothermal compression of TCll alloy was conducted under the deformation temperatures ranging from 1023 K to 1233 K, the strain rates ranging from 0.001 s-1 to 10.0 s-1, and the height reductions ranging from 30% to 70%. The experimental results show that the deformation temperature can affect the morphology of α phase. At certain deformation temperature, the dynamic recrystallization occurs at high strain rate, and the temperature of the appearance of dynamic recrystallization decreases with the increase of the height reduction. The effects of strain rate, height reduction and deformation temperature on occurring of the dynamic recrystallization gradually decrease, and the best deformation parameters on dynamic recrystallization are the strain rates near 1.0 s-1, the height reductions near 50% and the deformation temperatures ranging from 1123 K to 1213 K.