Evaluation of new Ni-based superalloy prepared by EB-PVD
(1.Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China2.Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China)
Abstract: The sheet metal of a new Ni-based superalloy was prepared by electron beam physical vapor deposition(EB-PVD) technology. X-ray diffraction, transmission electron microscope, optical microscope, scanning electrical microscope and tensile equipment were used to research the microstructures and mechanical properties of this alloy before and after heat treatment. The results show that there are many defects in as-deposited alloy composed of microcrystallites, and after appropriately heat treatment, the grains grow up and the defect concentration is reduced. The average size of γ ’ particles increases gradually and the morphologies of γ ’ particles change from spherical shape into cubical shape corresponding to different aging treatment temperatures from low to high. Compared with as- deposited alloy, the mechanical properties of heat-treated alloy are improved obviously. It is feasible that superalloy of better properties can be prepared by EB-PVD technology.
Key words: electron beam physical vapor deposition； Ni-based superalloy； microstructures； mechanical properties