Effects of Cooling Methods on Microstructure and Lattice Parameters of FGH95 Superalloy

By means of different cooling methods, microstructure observation and X-ray diffraction analysis, an investigation has been made into the influences of the cooling methods on the microstructure and lattice parameters of FGH95 superalloy. The results shown that, after the solution treated alloy is cooled at different mediums, fine gamma' phase and carbide particles dispersedly distribute in the grain and coarser gamma' phase discontinuously precipitates along grain boundaries. After X-ray diffraction analyzed, the gamma and gamma' phases in "molten salt cooling" alloy possess larger lattice parameters, and a bigger lattice misfit exists in the interface between the gamma and gamma' phases.