Research on deformation and microstructure evolution during forging of large-scale parts

Based on the rigid-viscoplastic finite element method (FEM), an investigation on large-scale forging parts deformation was carried out with the mode of twist-compression deformation adopted in this study. The processing model coupled thermal, mechanical and microstructural phenomena, in which some empirical equations for recrystallization evolutions were obtained using the Gleeble-3500 thermomechanical simulator. Through FEM simulation, the distributions of different field-variables, such as force, strain and grain size and so on, were obtained. After different forging parameters were employed, one can know that twist-compression deformation style can decrease the deforming pressure effectively and make deformation more homogeneous through analyzing these results. And it is worth mentioning that compared with upsetting this changed forming style makes grain sizes in the metal inner decrease and their distributions more uniform. Thus, the comprehensive properties of large-scale forging parts will be improved.