Study on microstructure and properties of 431 stainless steel laser cladding layers based on 316L transition layers
316L stainless steel was prepared as the transition layer by laser cladding technology,and 431 marten-sitic stainless steel was used as the surface cladding layer on the transition layer.The microstructure of the clad-ding layer was analyzed by OM and SEM,and the phase composition of the cladding layer and transition layer was analyzed by XRD.The hardness distribution and corrosion resistance of the cladding layer were tested by mi-crohardness tester and electrochemical workstation.The test results show that the surface of the cladding layer obtained by adding the transition layer is smooth and flat,and there are no porosity cracks and other defects.The surface cladding layer is composed of martensite,ferrite and a small amount of residual austenite,and the transi-tion layer is composed of austenite.The hardness of the cladding layer decreases gradually from the top to the bottom.The hardness of the surface cladding layer is 538HV,which is 3 times higher than that of the substrate,and the average hardness of the transition layer is 300HV.The corrosion current of the cladding layer is 0.956 9 ×10-6 A/cm2,the corrosion potential is-0.166 44 V,and the corrosion resistance of the cladding layer is better than that of the substrate.
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