3D-FEM calculations of rafting in Ni-base superalloys based on high temperature elastic and lattice parameters

Abstract

The elastic constants of γ and γ' phases, the component phases of Ni-base superalloys, these belong to 1st, 2nd, and 3rd generation, have been measured at 900°C. Three dimensional FEM calculations have been conducted based on these measured elastic constants and lattice misfit. The elastic constants have been different between generations of superalloys, depending mainly on the amount of Re. The predicted raft structure have been different among the alloys, and it also depends on the introduction of interfacial dislocations.