Abstract
In this paper, the deformation resistance and recrystallization behavior in high temperature working (600-850°C) with high strain rates (2-150 l/s) which covers the most hot rolling conditions have been investigated.
In the usual hot rolling condition the dynamic recrystallization does not occur and the resistance to hot deformation is determined by the balance between strain hardening and dynamic recovery. The flow stress sharply increases with increase in the impurity content at higher purity condition while the hardening rate due to the increase in the impurity content becomes smaller if the range exceeds a certain value. The recrystallization and grain growth behavior of commercially pure titanium is similar to that of plain carbon steels in austenite phase. In commercially pure titanium deformation bands, which act as nucleation site for recrystallization, are more easily formed than in plain carbon steels.
The activation energy for hot deformation and recrystallization lies in a range between 220-260 kJ/ mol which is nearly the same for low strain rate deformation.
