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采用Gleeble—3500型热模拟试验机对TA15钛合金进行等温压缩试验,应变速率为1~0.01s-1、变形温度为900~1 050℃。结果表明:TA15钛合金在相变点附近的热压缩流变行为可采用含有Z参数的双曲正弦函数形式的本构方程来描述;在试验参数范围内,当变形温度和应变速率逐渐提高时,TA15钛合金内部显微组织和热变形机制发生改变,导致变形激活能先升高后降低;结合热加工图和热变形后的显微组织分析可知,在两相区上部(变形温度950℃左右)以较低的应变速率(0.1~0.01s-1)进行热变形时,由于完全动态再结晶的发生,材料具有较高的耗散效率,获得了晶粒细小且分布均匀的显微组织。
The isothermal compression test of TA15 titanium alloy was carried out by using Gleeble-3500 thermal simulation machine. The strain rate was 1 ~ 0.01s-1 and the deformation temperature was 900 ~ 1 050 ℃. The results show that the thermo-compression rheological behavior of TA15 titanium alloy near the transformation point can be described by using the constitutive equation of hyperbolic sine function with Z parameter. When the deformation temperature and strain rate are gradually increased within the experimental parameters, , TA15 titanium alloy internal microstructure and thermal deformation mechanism changes, resulting in deformation activation energy first increased and then reduced; combined with the hot working diagram and thermal deformation after the microstructure analysis shows that in the upper two-phase region (deformation temperature 950 ℃ ) At low strain rates (0.1 ~ 0.01s-1), the material has high dissipation efficiency due to the complete dynamic recrystallization, and the microstructure with fine grains and uniform distribution is obtained .