Forgital (Italy)

A good understanding of the thermomechanical history of the material during the ring-rolling of Superalloy 718 is the key for establishing the conditions adequate for processing aeronautical parts through this attractive route. With respect to the forging route, where the strain path is mainly unidirectional, in every ring-rolling revolution the part suffers two small strain increments where the deformation alternates from tangential to axial rolling. Here we present a finite element analysis of the ring-rolling operation of Superalloy 718 for a geometry and size typical of a low-pressure turbine part, focusing on the reverse vs. effective strains imparted in the operation and in the heterogeneity of their ratio in the section of the ring.