Microstructure and Tribological Properties of Micro and Nanostructured Composite Coating by Induction Cladding

A micro and nanostructured WC composite coating with accumulated nanostructured WC particle and micron WC as the reinforcing phase was fabricated on 45 steel by induction cladding with Ni60A, micro and nanostructured WC alloy powders as the raw materials. Microstructure of the coating was characterized by scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy. Wear resistance of the composite coating in dry sliding was evaluated under ambient condition. The results show that the induction cladding composite coating has homogeneous microstructure consisting of WC、Cr_(23)C_6、Co_6W_6C uniformly distributed in the γ-Ni solution matrix and is metallurgically bonded to the substrate. The coating has high hardness and excellent wear resistance.