Effect of processing parameters on hot deformation behavior and microstructural evolution during hot compression of Ti40 titanium alloy

Effects of the processing parameters on the flow stress behavior and the microstructural revolution are investigated in the hot compression of Ti40 alloy. The experimental results show that the flow softening occurring at high strain rate, is associated with deformation heating, flow instability, cracking and DRX, while that occurring at low strain rate is contributed to DR and DRX. Effects of processing parameters on microstructural revolution are analyzed. At low temperature (<950°C) and low reduction (<30%), DRX scarcely occurs, while oxidation cracking is grievous at the temperature of 1100°C. Moreover, the recrystallized grain size decreases with the increasing of strain rate. Furthermore, flow instability occurs at the reduction of 70% and strain rates of 1 and 10s^-1. It indicates the complicate effects of processing parameters on microstructural revolution, and is helpful for the control of microstructure and optimization of processing parameters.