Microstructure and Properties of Laser Cladding Ni-based Coating
The laser remanufacturing repair technology for 17-4PH precipitation hardening martensitic stainless steel blades is taken as study background.In this study,nickel chromium alloy and WC-Co composite powder were selected as cladding materials.Laser cladding technology was used to prepare composite coatings on the surface of 17-4PH stainless steel.Experiments were conducted by adjusting two process parameters:laser power and powder feeding speed.By observing the microstructure of the sample cladding layer and testing the mechanical properties of the cladding layer,the results showed that when the laser power was 1 700 W,the microstructure of the coating was uniform and dense.The hardness and wear properties of the coating are higher than those of the substrate.The optimal process parameters are laser power of 1 700 W and powder feeding speed of 30 mg/s.The composite coating prepared under these process parameters effectively improves the hardness and friction wear resistance of 17-4PH stainless steel.
laser claddingNi-based coatingprocess parametersmicrostructure and properties
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