Abstract:The phase structure,microstructure,microhardness and wear performance of the composite clad layer are analyzed by optical microsccopy(OM),X-ray diffraction(XRD),scanning electron microscopy(SEM),electron probe microanalyzer(EPMA)micro-hardness tester and wear testing.The reasult indicates that TiN and TiB are in situ synthesized in the cladding layer and are compared with needle platelet and equiaxed type microstructures.Laser density plays an important role in microstructures.With the increase of laser density,microhardness and wear resistance rise,the main mechanism of the sbustrate is severe adhesive wear mechanism.However,the wear mechanism of cladding layer is a combination of adhesive and abrasive wear characteristics,and the abrasive wear characteristics is the main wear mechanism.