Multi-objective optimization of process parameters of 45 steel laser cladding Ni60 alloy powder

In order to extend the service life of the parts and reduce the production costs, the laser cladding of the Ni60 molten coating layer on the 45 steel surface can meet the production requirements, avoid the waste of resources and achieve green manufacturing. The weights were determined by analytic hierarchy process and a three-level, three-factor orthogonal test was established to analyze the macro and micro morphologies, friction wear characteristics and micro hardness of the molten coating layer. The results show that the optimized process parameters are laser power of 3 kW, a scanning speed of 12 mm/s and overlap rate of 45%. The suitable process parameters can refine the tissue grain and avoid the generation of cracks and pores. The coating obtained by optimizing the process parameters has better wear resistance, lower friction coefficient, less wear weight loss than the base, the wear mechanism is abrasive wear and the hardness is three times that of the base.