Study on Metallographic Structure and Performance of Fe90/WC Composite Coating Prepared by Laser Cladding
A series of Fe90 coating containing different concentration of WC were prepared by laser cladding,which is based on the internal laser coaxial-powder feeding technology.The inverted metallurgic microscope and vickers hardness tester were used to investigate the microstructure and microhardness of the composite coatings.The slurry jet erosion tester was also employed to study the erosion resistance.The results show that the coating is compact and has a good metallurgical bonding with the substrate.Crack,holes and other defects are also negligible.The microhardness of the coatings is increased with the addition of WC,it reaches 728 HV0.2 when WC concentration is 60％,which is equal to 2.4 times than that of Fe90 coating without WC.It is also revealed that a suitable amount of WC may lead to excellent anti-erosion performance,when it is 40％,the mass loss is obviously lesser than others.
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