Microstructure and properties of FeMnCrAl/Ni coated WC coatings deposited by high velocity arc spraying

Ni-coated WC composite powders were prepared by ultrasonic-assisted electroless plating process without conventional sensitization and activation treatments at room temperature.Ni-coated WC composite powders were used as reinforcing phase in core wires.FeMnCrAl/Ni coated WC coating was deposited on grade 20 steel substrate by high velocity arc spraying.The effect of Ni coated WC composite powders on microstructure and properties of the coatings have been studied and analyzed by optical microscopy(OM),field emission scanning electron microscopy(FE-SEM),energy dispersive spectrumeter(EDS),tensile test and erosion wear test.The results show that FeMnCrAl/Ni coated WC coating has less fraction of oxidel and porosity,denser structure and higher bonding strength between phases in the coating than those of FeMnCrAl/WC coating.The bond strength to the substrate and erosion wear resistance of FeMnCrAl/Ni coated WC coating are significantly improved,compared to those of FeMnCrAl/WC coating,but erosion wear mechanism of FeMnCrAl/Ni coated WC coating and FeMnCrAl/WC coating remains unchanged.