Deformation behaviour of the hot upsetting cylindrical specimen with dynamic recrystallization

Based on the homogeneous deformation assumption, the hot upsetting of the small cylindrical specimen is usually used for generating the material parameters of metals under hot working condition. However, the homogeneous deformation is impossible due to friction. This paper first summarizes the viscoplastic model considering dynamic recrystallization, and then compiles the axisymmetrical finite element software to simulate the upsetting processing of the cylindrical specimen, at last applies the complied software to study the deformation behaviour of the upsetting cylindrical specimen with dynamic recrystallization and assesses the suitability of the assumption for the generation of the material parameters based on the simulated result, taking the model considering dynamic recrystallization as an example. For the model in question, the study shows that the reliability of the stress–strain curve is very high; however, the reliability of most of the microstructures is relatively low.