Effect of the deformation and thermal treatment parameters on the mechanical properties of the VT20 titanium alloy

Abstract

In this work, the true stress–true strain curves were constructed for the VT20 titanium alloy at deformation temperatures from 750 °C to 980 °C and strain rates of 0.001–1 s−1. The data were obtained by hot compression using the Gleeble-3800 equipment. During deformation at a rate of ε̇ = 0.1 s–1, the process of dynamic recrystallization is observed. With an increase in temperature to 950 °C, the number of α-phases that have undergone recrystallization gradually increases and reaches the highest value. During the hot compression of the titanium alloy, a dependence of deformation resistance on the strain rate and deformation temperature is also observed. A decrease in deformation resistance occurs as the strain rate decreases and the temperature increases. Therefore, a conclusion was made that it is advisable to carry out high-temperature deformation of the titanium alloy in the range of temperatures of 875–980 °C and deformation rates of 0.01–0.10 s–1.