Dependence of creep rupture life on primaryγ′ of a liquid metal cooling directionally solidified nickel-based superalloy

Abstract

The dependence of the creep rupture strength on the microstructure of a liquid metal cooling directionally solidified nickel based superalloy was investigated over a wide range from 980 to 1100uC. The creep rupture lives were prolonged especially at 980uC/310 MPa as a result of the elimination of the blocky primary c9. The fractured specimens were sectioned and examined to reveal the deformation microstructures and active dislocation deformation mechanisms.