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Wang Y.-L.,Henan University of Science and Technology | Wang Y.-L.,Henan Key Laboratory of Advanced Non Ferrous of Metals | Yu H.,Henan University of Science and Technology | Yu H.,Henan Key Laboratory of Advanced Non Ferrous of Metals | And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

WC coatings were deposited on the surface of 40Cr steel with electro-spark deposition by taking WC alloy as electrode and industrial pure argon as shielding. Microhardness, surface morphology, interface behavior, chemical composition and phase of the WC coatings were investigated by means of HV-1000A microhardness instrument, JSM-5610LV scanning electron microscopy and energy spectrum analysis, and X-ray diffraction. The results show that micro-cracks and voids exis in the deposited WC coatings on the surface of 40Cr steel and the phases of the coatings mainly consist of W, Fe6 W6 C, Fe3 C and Cr23C6. Microhardness of the WC coating layer reaches 820 HV, is about 3.5 times higher than that of the 40Cr substrate. The deposition coating has a continuous and compact cross-section with the thickness of 30 μm. Mutual diffusion of elements and alloying process occur between the WC deposition coatings and the 40Cr substrate, the bonding is a metallurgical one and no obvious interface is observed. Source


Yu H.,Henan University of Science and Technology | Yu H.,Henan Key Laboratory of Advanced Non Ferrous of Metals | Pan Q.-H.,Henan University of Science and Technology | Pan Q.-H.,Henan Key Laboratory of Advanced Non Ferrous of Metals | And 7 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2010

WC coating was produced on surface of 35CrMo steel by electro-spark deposition. The micro hardness, microstructure, chemical composition and phases of the coating layer were examined by means of hardness test, scanning electron micro scopy (SEM) and energy dispersive spectrumeter(EDS) aualysis, and X-ray diffraction (XRD). The results show that micro hardness of the coating layer is about 2.5 times as that of the substrate. Inter-diffusion occurs and metallurgical bond forms between coating layer and substrate. The main phases of the coating consist of Fe7C3, Fe3W3C, Fe2W2 C and Fe7W6. Source

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