Method for deformation-heat transfer-microstructure evolution coupling analysis via constitutive relationship based on microstructural evolution

A method for establishing the constitutive relationship based on microstructural evolution has been put forward by authors for the constitutive relationship to embody complicated interaction among deformation, heat transfer, and micro-structural evolution (DHTME) during hot forming process. Using this kind of constitutive relationship as media, a method for DHTME coupling analysis was formulated and software called DHTMECA was developed according to the proposed method. DHTMECA was employed to simulate the forging process of GH4169 alloy disk on hydraulic press. The simulating results indicate that DHTMECA not only can reveal the change in shape and dimension of billet with time and the evolution of thermomechanical parameters during hot forming process, but also can provide the details of dynamic recrystallization process within the billet, laying the foundation for the optimal control of forging process and the optimization of microstructure development from the aspect of process modeling. The commercial FEM codes, such as DEFORM, AUTOFORGE, SUPERFORGE do not have the above functions.