Hot deformation behavior and processing maps of Ti-1300 alloy

Hot compression behavior of the Ti-1300 alloy was studied to optimize the processing parameters and ascertained the microstructural evolution mechanism. The flow stress–strain curves were measured. The deformation active energy was calculated. The kinetic equation and the processing maps are established to characterize the deformation behavior of Ti-1300 alloy in hot compression. It is revealed that the flow stress is dependent on the strain rate and the deformation temperature. The deformation active energy is 178 kJ/mol in the β phase region and 216 kJ/mol in the α+β phase region, which are higher than that of self-diffusion active energy of β phase. In present range, the optimum processing parameters for hot working are 800 °C/0.01 s−1 with a peak efficiency of about 0.48 and 860 °C/0.01 s−1 with a peak efficiency of about 0.50, which may be considered to be a feasible working condition. In addition, when the strain rate is higher than 1 s−1, Ti-1300 shows flow localization, which should be avoided.