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Microstructure, Phase Constituents and Wear Behavior of Fe/Ni-Based Laser Clad Layers
Y. Guo, W-T. Yang, B. Xu, Y. Song and P-G. Li

The Fe/Ni-based coatings fabricated by high power diode laser (HPDL) cladding (expressed as laser clad layers) were used as the renovated or modified layers formed on a 4Cr5MoSiV1 steel substrate. The laser clad layers with high strength ceramic particles were prepared on the steel by means of an industrial set up so as to improve the mechanical and tribological properties of the metal substrate. The microstructure and phase constituents, as well as microhardness and wear properties of the laser clad layers were analysed in detail. The carbides or ceramic phases were dispersed within grains for Fe/Ni based clad layer. Especially, the two kinds of Ni/Fe based clad layers containing WC particles present excellent properties combined with a high hardness and a good dry friction wear and impact abrasive wear resistance, greatly prolonging the service life of metal components. These laser clad layers were widely used in electric power industry, such as steam turbines, hydroturbine, boiler tube, valve body in power station. In addition, the laser clad layers have been used for the metal component in the coal and mining industries.

Keywords: High power diode laser (HPDL), 4Cr5MoSiV1 steel, Fe/Ni-based coatings, laser clad layer, microstructure, phase, hardness, dry friction wear, impact abrasive wear

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