Nowotny, S.S.NowotnyTechel, A.A.TechelMüller, A.A.MüllerLuft, A.A.Luft2022-03-032022-03-031994https://publica.fraunhofer.de/handle/publica/185297Many applications in machine building require surface layers whose wear properties are comparable with those of sintered hard metal. One technique for solving this problem is laser cladding with a powder mixture of carbide particles and a ductile metal binder. In the present work, powder mixtures of WC/Co agglomerated carbide and WC/Wsub2C melt carbide, combined with a self fluxing Ni-alloy and Stellite 21, are clad onto a low carbon steel. By using optimized process parameters, a repeatable composite coating free of cracks and with low iron dissolution can be reached. The typical structure shows a homogeneous distribution of coarse, non-melted carbide particles within the metallic matrix alloy. The carbide content is up to 50 volume percent. Large-scale investigations on the wear behaviour show that the wear resistance of laser clad coatings comes close to that of classical, sintered hard metal WC/Co. In contrast to sintered hard metal, these coatings have a higher toughness, which pr ovides good performance also under more complex loading conditions including impact or thermoshock.decarbide coatingHartstoffschichtlasermicrostructureMikrostrukturOberflächenbearbeitungsurface treatmentVerschleißwear protection667621671book article