Establishment of Cryogenic Constitutive Model for Ti-6Al-2Zr-1Mo-1V Titanium Alloy

Abstract Ti-6Al-2Zr-1Mo-1V (TA15) titanium alloy is widely used in aerospace and other key fields because of its excellent properties such as specific strength, specific stiffness, and corrosion resistance. TA15 titanium alloy has low thermal conductivity and high cutting temperature, which is a typical difficult-to-machine material. The cryogenic machining technology can effectively improve the problems of high cutting temperature and poor machining quality during the machining of titanium alloy. Many researchers have studied the constitutive model of TA15 titanium alloy in order to reveal the machining mechanism, but there has been no research on the cryogenic constitutive model of TA15 titanium alloy. In this paper, a series of tensile tests at low temperature were conducted with TA15 titanium alloy as the research target; The cryogenic constitutive model was established, and the accuracy of the cryogenic constitutive model was verified based on the unequal shear zone model. The test results show that the strength of TA15 titanium alloy increases and the plasticity decrease at low temperatures. the strengthened stage of TA15 titanium alloy was significantly shortened at − 196°C; The maximum error of shear force calculated by orthogonal cutting tests is less than 20% compared with that predicted by cryogenic constitutive model.