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 13 phase region and 216 kJ/mol in the alpha+beta phase region, which are higher than that of self-diffusion active energy of 13 phase. In present range, the optimum processing parameters for hot working are 800 degrees 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. (c) 2014 Elsevier B.V. All rights reserved.