Study of Recrystallisation Mechanism During Hot Deformation of 18CrNiMo7-6 Steel

This article investigates the effects of deformation parameters on the Dynamic Recrystallization Mechanism of 18CrNiMo7-6 steel during hot working. Thermal compression experiments were conducted under varying conditions of strain, strain rate, and deformation temperature using a Gleeble-3500 Thermal Mechanical Simulator. Models for the intrinsic and Dynamic Recrystallization Volume Fractions were developed, and the microstructure was characterized using Optical Microscopy and Electron Backscatter Diffraction. The results indicate that strain, strain rate, and deformation temperature significantly influence Dynamic Recrystallization Mechanism in 18CrNiMo7-6 steel. High strains and deformation temperatures promote Continuous Dynamic Recrystallization Mechanism, whereas Discontinuous Dynamic Recrystallization Mechanism is favored at low deformation temperatures. The effect of strain rate is more intricate; lower strain rates encourage Discontinuous Dynamic Recrystallization Mechanism, while higher strain rates tend to favor Continuous Dynamic Recrystallization Mechanism.