Effects of Laser Cladding Spot Shape on Microstructure and Wear Resistance of Iron-based Coatings
Iron-based wear-resisting coatings were prepared on H13 steel by linear spot laser cladding and round spot laser cladding.The effects of different spot shapes on the cladding efficiency,composition phase,microstructure and wear-resisting properties of iron-based coatings were studied by XRD,SEM and EDS.The results show that the coatings prepared by round spot laser cladding technology and linear spot laser cladding technology are both defect-free coatings.Because linear spot laser cladding technology has larger spot area and faster scanning speed,the cladding efficiency of linear spot laser cladding coating is 4.4 times that of round spot laser cladding coating,and the dilution rate is lower.It is about 1/5 of the round spot laser cladding coating.Because the linear energy of round spot is higher than that of linear spot,the contents of martensite and carbide in round spot laser cladding coating are higher than those in linear spot laser cladding coating,and the hardness and wear resistance of round spot laser cladding coating are higher than that of linear spot laser cladding coating.
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