The influence of strain on deformation microstructure evolution of PH13-8Mo steel was investigated
through isothermal compression tests using Gleeble thermal mechanical simulator within the temperature range of 1 050 to 1 150 and with the strain rate of 10/ s. The results show that dynamic recrystallization occurs partially when the strain reaches maximum 0. 69 at 1 050. However, at 1 100 and 1 150, full dynamic recrystallization has occurred when the strain reaches 0. 29 and 0. 24, respectively. The fraction of recrystallization increases with increasing strain and deformation temperature. The recrystallized grain size and average grain size of the impacted steel markedly reduce with the strain before the strain reaches 0. 29, then slowly reduce. However, the recrystallized grain size and average grain size of the impacted steel both increase with increasing deformation temperature.