Study on Laser Cladding Process Parameters Optimization and Performance of Fe-based Alloy
Adopting laser cladding technology,Fe-based metal powder coating was used to repair the surface cracks of hot rolling rolls,and then the mechanical properties of the coating was tested,the optimal process parameters were explored.The coating was prepared under laser cladding process parameters.The required test samples were cut out from the coating.X-ray diffraction(XRD)was used to analyze the phase composition of Fe-based metal laser cladding samples.The microstructure of the Fe-based laser cladding sample was analyzed by metallurgical microscope,and the crystal structure of the Fe-based laser cladding sample was analyzed by scanning electron microscope(SEM).The Vickers microhardness of Fe-based metal laser cladding samples was tested by microhardness tester.A high-speed friction tester was used to test the friction resistance of Fe-based metal laser cladding samples.The results show that the coating structure is compact and dense,there are no cracks and pores on the surface of all coatings,the phase is basically(Fe,Ni),the hardness is 260-428 HV0.2,and the friction coefficient of the coating is about 0.6.The wear rate is in the order of 10-5.The Fe-based metal powder laser cladding coating has good mechanical properties,which can repair the roll well and prolong the service life.2000 W laser power and scanning speed of 10 mm/s are the best cladding parameters.
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