The Behavior of Recrystallization of Pure Iron After High-Speed Deformation

Abstract

The effect of deformation rate on the behavior of recrystallization has been studied with pure polycrystalline iron, compressed 60 pct at two widely different rates. Within the temperature range of 600° to 650°C, the isothermal recrystallization curves of the dynamically deformed iron (impact velocity, 12 m/sec) and the statically deformed iron (crosshead speed, 10 mm/min) are obtained. The recrystallization rate after dynamic deformation is considerably smaller than that after static deformation. However, at the beginning of the annealing process, it seems that the nucleation rate of recrystallization of the dynamically deformed iron is larger. The activation energy for recrystallization of the dynamically compressed iron is larger by 40 pct than that of the statically deformed one.
It is also investigated that there are the differences of the work-hardening and the microstructure between the dynamically deformed iron and the statically deformed iron.