CO2 Laser Cladding and Plasma Cladding of Ni-Based Alloy Powder on the SUS316LN Stainless Steel

Abstract

Clad layers of Ni-based alloy were deposited on the power plant machinery parts made of SUS316LN stainless steel by CO2 laser cladding and plasma cladding. A smooth clad bead was obtained by CO2 laser cladding. The phases of the clad layers were investigated by laser microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, electron probe microanalysis (EPMA), and energy-dispersive spectroscopy (EDS). The microstructures of clad layers belonged to a hypereutectic structure. Primary phases consisted of boride CrB and carbide Cr7C3. The eutectic structure consisted of Ni + CrB or Ni + Cr7C3. Compared with plasma cladding, excellent wear resistance, fine microstructures, low dilutions and high Vickers hardness were obtained by CO2 laser cladding. All these results show that laser cladding realizes higher efficiency and good cladding quality.