High Temperature Plastic Deformation Behavior and Hot Processing Map of Ti-6Al-7Nb Alloy

The Gleeble-3500 thermal simulation compression testing machine was used to carry out compression experiments on Ti-6Al-7Nb titanium alloy at different temperatures and strain rates. The high temperature deformation behavior and hot working characteristics of Ti-6Al-7Nb titanium alloy at deformation temperatures of 1023, 1073, 1123, 1173 K, strain rates of 0.005, 0.05, 0.5, 5, 10 s(-1), and maximum deformation of 60% were analyzed. The results show that deformation temperature and strain rate have a great influence on the flow stress of Ti-6Al-7Nb titanium alloy, and have complex effects on work hardening and flow softening during the hot plastic deformation of the alloy. The strain rate has a significant effect on the deformation hardening effect of the alloy. The main phases of Ti-6A1-7Nb titanium alloy after hot plastic deformation are as follows: primary alpha phase, lamellar alpha phase, secondary alpha phase, lamellar beta phase and spheroidized primary alpha phase. The Arrhenius constitutive equation model is suitable for high temperature deformation of Ti-6Al-7Nb titanium alloy under low temperature, low strain rate and high temperature, high strain rate deformation conditions. The hot processing map of Ti-6Al-7Nb was constructed using MATLAB. And the optimum plastic deformation range of the alloy is determined by calculation: the strain rate is 0.0067 similar to 0.1353 s(-1) and the temperature is 1073 similar to 1173 K.