B-1 MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF HVOF SPRAYED Cr_3C_2-NiCr COATING ON NICKEL-BASED SUPERALLOY SUPERNI 718(Session: Coatings)

抄録

This paper reveals the successful application of Cr_3C_2-NiCr coating on the Ni-based superalloy Superni 718 (18.5Fe-19Cr-5.13Ta-3.05Mo-0.9Ti-0.5 Al-0.18Mn-0.18Si-0.15Cu-0.04C-bal Ni (Wt%) by the high velocity oxy-fuel (HVOF) process using LPG gas as a fuel. The combined techniques of optical microscopy, X-ray diffraction (XRD), scanning electron microscopy/energy-dispersive analysis (SEM/EDAX) and electron probe microanalysis (EPMA) have been used to characterise the microstructure, porosity, coating thickness, phase formation and microhardness properties of the coating-substrate composite.