Dynamic Recrystallization Behavior Under Inhomogeneous Thermomechanical Deformation State

Dynamic recrystallization (DRX) is of great significance for refining grains, improving mechanical properties, and obtaining high-quality products during thermomechanical deformation. This article studies the DRX behavior of low-carbon steel within the temperature range of 900 - 1100 degrees C and the strain rate of 0.01-1 s(-1) based on the Gleeble-3800 thermal-simulation experimental machine and establishes a DRX kinetic model suitable for different strain rates. The established model is embedded in the DEFORM-3D simulation software to simulate the DRX behavior of high-temperature plastic deformation of the material and to study the influence of the deformation amount, deformation temperature, and strain rate on the deformation inhomogeneity of the material. The results show that under the strain rate of 0.01-1 s(-1), the 2/5 position from center to surface corresponds to the preset strain, and under the strain rate of 0.1-1 s(-1), the 1/2 position from center to surface corresponds to the preset strain, and the importance of the sampling position is proved in combination with the DRX behavior. This article establishes a sampling theory that describes the position corresponding to the preset deformation amount, and it is important for guiding subsequent microstructural characterization experiments to reveal the DRX behavior of materials during thermomechanical deformation.