Research of Forming Microstructure of Copper/Graphite Composite Coating Prepared Based on Laser Micro-cladding

Abstract

Abstract In order to further study the forming process and evolution mechanism of new copper / graphite composite coating based on laser microcladding technology, three groups of alloy powder materials with different proportions were set up, and the 1500W fiber laser was used to prepare micro-cladding coatings on 45# steel substrates. According to the known macroscopic morphology, four groups of cladding samples with uniform, smooth and dense surface were selected for analysis, the microstructure characteristics, element distribution and growth morphology, and the causes of microstructure defects were qualitatively and quantitatively analyzed by means of the metallographic test, SEM and EDS.On this basis, the relationship between the interfacial reaction mode affected the forming microstructure of micro-cladding coating and the flow behavior of molten pool was obtained, which can be used as a reference for the optimization and regulation of the process.