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Abstract

Owing to the excellent performance of Ni-base single crystal superalloys to resist extreme working conditions at high temperature, they are the material of choice for application in the hottest regions of modern gas turbine. Although the deformation resistence at the elevated temperature significantly increases by adding a high concentration of refractory elements, a stronger dendritic segregation during solidification and pores accumulation in the interdendritic region during an extensive homogenization heat treatment tend to occur, which deteriorates mechanical properties of materials (Link, T. 2006). In order to heal these micropores, hot isostatic pressing (HIP) as an advanced thermal treatment is utilized, which combines creep deformation and diffusion bonding to homogenize the alloy composition by the appropriate pressure and high temperatures (Kim, M.T. 2006).