Fabrication of Fe-Ti-Mo-C composite coating by laser cladding

Fe-Ti-Mo-C composite coatings were deposited on the steel by laser melting mixture of Fe-Ti,Fe-Mo and graphite powders.The phase structure and microstructure of the coatings were investigated by X-ray diffraction,field emission scanning electron microscope and electron probe micro-analyzer.Meanwhile,the microhardness and wear properties of the coatings were also tested by means of micro Vickers and block-on-ring wear testing machine.The results showed that(Ti,Mo) C multiple carbides were formed during laser cladding process.(Ti,Mo) C carbide has typically faceted feature,but the lattice pattern of(Ti,Mo) C carbide is somewhat less than that of TiC.With an increasing of addition of Fe-Mo,the microhardness and wear resistance of the coatings increased,but the crack resistance of the coatings decreased.