Study For Laser Cladding Of Alloyed Powder On The Steels Of Gcr15

In this paper,Co based alloyed powder composite coatings on GCr15 steel were produced by TEM₀₀ laser cladding with synchronous powder feeding method.With the equipments of optical microscope and Rockwell hardness tester,we study the effect of the laser processing parameters on Co47-49-1 alloy single-channel laser cladding layer.Optimized the optimal processing parameters,Co/WC with Co47-49-1 alloy powder are coating on GCr15 by multi-track overlapping laser cladding.By using SEM,XRD,TEM and friction wear testing machine,the effect on metallic phase structure,microstructure and frictional wear character are studied systematically.The experimental results indicate that:when the power is 1100W,the scanning speed is 300mm/min,defocusing distance is 35mm,powder feeding speed is 7.12g/min,the dilution rate of Co47-49-1 alloy single-channel laser cladding layer is low,and the quality is the best. Multi-track overlapping laser cladding Co based power layer is composed byγ-Co, CoCx,Cr₂₃C₆,CoW₂B₂ and Co₆W₆C phases.With the increasing of WC content in the composite coating,the wear resistance increase gradually.The wear volume of Co+6%WC laser cladding layer is decreased by 90%with matrix,and wear resistance increased 6.5 times as well.Wear mechanism changes from abrasive wear to abrasive wear and adhesive wear gradually.