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利用Gleeble-3800热模拟试验机对beta C钛合金进行等温压缩试验,研究其在β相区的热变形行为。得到了描述热变形行为的本构方程,获得了真应变为0.7时的加工图。采用光学显微镜、扫描电子显微镜和电子背散射技术对变形显微组织进行表征。结果表明:流变应力随着应变速率加快而增大,随着试验温度的升高而减小。计算得到的表观激活能为167 k J/mol,接近β钛的自扩散激活能。加工图和显微组织观察表明在温度为900~1000°C和变形速率为0.1~1 s~(-1)的区间存在一个动态再结晶区。加工图显示,当变形速率大于1.7 s~(-1)时,beta C钛合金发生不稳定变形。Beta C钛合金在动态再结晶区变形后,经合适的热处理,显微组织可以被优化。
The isothermal compression test of beta C titanium alloy was carried out on a Gleeble-3800 thermal simulator to study its thermal deformation behavior in the β phase. The constitutive equation describing the thermal deformation behavior was obtained, and the processing diagram of true strain of 0.7 was obtained. Deformation microstructure was characterized by optical microscope, scanning electron microscopy and electron backscattering. The results show that the flow stress increases with the increase of strain rate and decreases with the increase of test temperature. The calculated apparent activation energy is 167 kJ / mol, close to the self-diffusion activation energy of β-titanium. The processing and microstructure observations show that there is a dynamic recrystallization zone in the temperature range of 900-1000 ° C and the deformation rate of 0.1-1 s -1. The processing diagram shows that when the deformation rate is greater than 1.7 s ~ (-1), the unstable deformation of beta C titanium alloy occurs. Beta C titanium alloy in the dynamic recrystallization zone deformation, the proper heat treatment, the microstructure can be optimized.