Properties of Ni-based alloy powder cladding layer by CO₂ laser beam and plasma

To improve the properties of SUS316LN stainless steel in power plant part,a cladding layer was deposited on the surface of SUS316LN stainless steel by laser cladding and plasma cladding.The cladding layer was analyzed by the laser microscope,scanning electronic microscope (SEM) and X-ray diffraction (XRD),electronic probe (EPMA) and energy dispersive spectrometer (EDS).The results indicate the cladding layer belongs to hypereutectic structure.Primary phase is made of boride (CrB) and carbide (Cr₇C₃),and eutectic structure is made of γ-Ni + CrB or γ-Ni + Cr₇C₃.Compared with plasma cladding layer,the CO₂ laser cladding layer has higher wear resistance, smaller microstructure,lower dilution and higher cladding efficiency.