Abstract
ABSTRACTAISI 8620 steel substrates were coated with WC–Co and Cr3C2–NiCr by using the atmospheric plasma spraying (APS) method. Subsequently, surface melting of samples coated with APS was performed at different current values using the plasma transfer arc (PTA) method. Microstructure, microhardness, and wear properties of as-sprayed and surface-modified coatings were investigated. The microstructure of the APS-coated surface had some voids, cracks and nonhomogeneous areas. These defects were eliminated with the PTA surface modification process and microstructural properties of coatings were improved. The wear resistance of PTA modified coatings was also increased. The highest wear resistance and microhardness were obtained in WC–Co coating modified by PTA at a current of 80 A. The wear resistance of this coating was 8.5 times higher than that of the substrate. The coating hardness reached values as high as 980 HV0,1 in this coating.
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