Microstructure and properties of Fe-W composite coating by laser cladding

An investigation of laser cladding Fe-W composite coating on Q235 steel was performed by injection of tungsten powder.The microstructure of the coating was analyzed with X-ray diffraction(XRD),optical microscope,scanning electron microscopy(SEM) and energy disperse spectroscopy(EDS).The microhardness and wear resistance were examined by hardness tester and abrading machine.The coating was metallurgically bonded with the substrate without visible crack or pore.The clad layer had a microstructure consisting of primary coarse dendrite or short stick Fe₇W₆ and fine isolated Fe₂W particles which uniformly dispersed in the α-Fe matrix.The average microhardness of the clad layer was approximately 700 HV which was 3.5 times greater than that of the Q235 substrate.The wear resistance was also obviously improved.