Experimental and numerical investigation on the evolution of Taylor-Quinney coefficient in 42CrMo steel

42CrMo steel was studied in this paper on its thermomechanical behavior when subjected to dynamic compression, utilizing in-situ dynamic tests and crystal plasticity finite element method (CPFEM) simulations. A split Hopkinson pressure bar, combined with high-speed infrared thermography, was employed to simultaneously record the mechanical response and corresponding temperature evolution, enabling the derivation of the Taylor-Quinney coefficient (TQC). To explore the impact of texture orientation on thermomechanical behavior, a dislocation density-based CPFEM model was applied to analyze the plastic deformation process. The findings demonstrate a satisfactory consistency between numerical predictions and experimental results achieved by the dislocation density-based CPFEM. Simulations of four typical textures demonstrated that texture, through changes in the activated slip systems, significantly influences the evolution of the TQC. These findings contribute valuable insights to the TQC database, enhancing our understanding of material behavior under dynamic loading conditions. (Figure presented.)