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Characterisation of laser modified WC-CoCr coatings
Chikarakaraa, Evans; Punset Fusté, Miquel; Picas Barrachina, Josep Anton; Brabazon, Dermot; Naher, S.
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CDAL - Centre de Disseny d´Aliatges Lleugers i Tractaments de Superfície
In this work the affects of laser characteristics on surface morphology, microstructure, microhardness and wear rates of high velocity oxygen fuel (HVOF) WC–CoCr coatings were investigated. Continuous and pulsed laser treatments were applied on the HVOF coatings using a CO2 laser of 10.6 μm wavelength. Continuous laser treatment significantly improved homogeneity of the coatings. Pulsed laser treatment produced significantly higher discontinuities compared to continuous mode. Microhardness increased by 45% for continuous mode laser modified WC-CoCr coatings. However, wear resistance deteriorated, with a notable 40% increase in wear rate. The variations in coating properties were attributed to the re-melting and rapid quenching of the CoCr bonding matrix allowing for WC redistribution.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials::Metal·lúrgia
CO2 laser surface modification
American Institute of Physics (AIP)

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