Abstract
External signal steady magnetic field and electric-magnetic compound field were applied to investigate the influence of the electromagnetic field to the laser cladding NiCrBSi coatings. The macromorphology, phase composition and microstructure were identified by optical microscope (OM), confocal scanning laser microscope (CSLM), X-ray diffraction (XRD) and scanning electron microscope (SEM) coupled with energy dispersive spectroscopy (EDS). The experimental results demonstrated that the main phase composition of the coatings was γ-(Fe,Ni), Cr23C6, Cr7C3, CrB, Ni3B with and without electromagnetic fields. Results showed that the dilution of the coating under electric-magnetic compound field was similar (14%) to the coating without auxiliary field. While the dilution of the coating had a decrease (10.8%) under signal steady magnetic field. Results of microstructure indicated the content of CrB phase in the coating increased obviously under electromagnetic field. The average microhardness of the coating under electromagnetic field was increased compared to that of the coating without auxiliary field. Corrosion resistance was also improved under electromagnetic field auxiliary laser cladding.
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