IMPROVEMENT OF A POWER GENERATION TURBINE DISC PROCESS USING A FINITE ELEMENT MODEL INCORPORATING METALLURGICAL PARAMETERS

摘要

In die forging of superalloys, the conditions of strain and of the subsequent heat cycle have a significant influence on the structure and properties of the final product. This is why the determination and modelling of grain size development during and after deformation is of primary interest. In this paper, using simulation and experimental tests, we investigate the thermal way of two different critical locations of an industrial part with a view to enhancing the knowledge of the forging thermal range and therefore to optimize the process. It appears that by this method, we are able to adapt the thermomechanical path to the geometrical form of the part. Today, the finite element model is not only used to correctly predict the material flow occurring in the part, but as this study will illustrate, numerical simulation has become an essential tool for process optimization and improvement of microstructure.