Lattice parameters and creep behaviors of a FGH95 Ni-based superalloy
1. School of Materials Science and Engineering， Shenyang University of Technology， Shenyang， Liaoning 110870， China； 2. Beijing Institute of Aeronautical Materials， Beijing 100095， China)
Abstract： By microstructure observation, lattice parameters determination and creep property measurement, the microstructure and creep behaviors of FGH95 alloy were investigated. The results show that the alloy is compacted and the coarse γ′ phase discontinuously precipitates along the previous particle boundaries after hot isostatic pressing treatment. The γ′ phase amount decreases after the alloy is fullly heat treated with dispersed fine γ′ phase in grain, and the carbide particles discontinuously precipitate along grain boundaries and in grain. After HIP alloy is fully heat treated, the XRD measurement shows that the lattice parameters of γ′ phase are decreased with increased γ phase in the alloy, and the large lattice misfit and lattice strain in the interface of γ and γ′ phase leads to creep resistance of alloy possesses high to achieve long creep lifetime under the condition of 1.034 GPa and 650 ℃. The creep deformation features of the alloy are dislocations tangling, dislocations crossing or shearing into γ′ phase.
2012, Vol. 33 
