Study on the dynamic recrystallization behavior of Ti-alloy Ti-10V-2Fe-3V in β processing via experiment and simulation

Hot compression tests of titanium alloy Ti-10V-2Fe-3V were performed at the temperature of 1098-1423 K and the strain rate of 0.001-1 s(-1) to examine the influence of deformation conditions over the dynamic recrystallization (DRX) of the Ti-alloy. The experimental results show the. occurrence of DRX with the bulging nucleation mechanism as a predominant mechanism in hot deformation of the alloy in beta-phase field. Partial grain refinement related to the incompletely DRX happened even after a large strain of 1.6. The simulation based on the established DRX kinetics model and a cellular automaton simulation approach coupled with the metallurgical principles of dynamical recrystallization and the practical parameters was conducted to predict the microstructure evolution with the completely DRX. The effects of strain rate and temperature on the steady state strain, volume fraction of DRX and the steady state grain size in DRX process were studied, and a satisfactory agreement between the predicted and experimental results was obtained. The research thus provides an approach to investigate and predict the DRX and microstructure evolution of Ti-alloys in hot working process. (C) 2014 Elsevier B.V. All rights reserved.