Abstract:Two kinds of heat treatment process was studied on the influence of the microstructure and mechanical
properties of K465 casting superalloy, the comparison with the same level superalloy used in the generic blade was
performed. The microstructures of K465 alloy were observed using optical microscopy (OM) and scan electron mi-
croscopy (SEM). The tensile and stress rupture properties of K465 alloy were measured. The results show that the
characteristics of blade made in china are smaller grain size,bigger dendritic structure, bigger size of γ′ phase by
comparison with the same level superalloy used in the generic blade. The hot isostatic pressing (HIP) process may be
partially or completely eliminated the loose in K465 alloy, however, the loose distribution is dense for the ordinary
process. HIP process can effectively reduce the size of γ′ phase, make dendritic densification and improve the tensile
and stress rupture properties. A small amount of loose, dense dendritic structure, regular dendritic arrangement and
the smaller size of γ′ phase may be the key factor of vibration fatigue property for the blade.
