Effect of Laser Cladding Parameters on Microstructure of Cladding Coating

Ni35 powder and Ni25 powder were used to prepare laser cladding coatings on 40CrNi2MoA substrate under different laser cladding parameters.The composition and structure of as-prepared laser cladding coatings were analyzed,and the effect of laser cladding parameters on the microstructure of the cladding coatings was investigated.Furthermore,the optimal laser cladding parameters were determined.Results indicate that a compact laser cladding coating without crack and hole can be prepared on substrate surface under the optimal laser cladding parameters.As-obtained laser cladding coating is bonded with the substrate through a metallurgical bonding layer thereby showing good adhesion to substrate.