Abstract
Fe-based composite coatings were fabricated on 5CrNiMo die steel by laser beam melting a precursor mixture of ferrotitanium, ferrochromium, ferromolybdenum, B4C and Y2O3 powders. Microstructure and properties of the coatings were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometer (EDS), resistance furnace and high-temperature tribometer. The results show that (Ti,Mo)C particles with flower-like and (Ti,Mo)B2 with block-like shapes are in situ formed during laser cladding. Volume faction of multiple ceramic particles increases with the increasing of Y2O3. The cumulative oxidation mass of the coating with 2 wt% Y2O3 is decreased by one-third than that of the coating without Y2O3. The oxidation layer of the coating with Y2O3 is getting smooth. Meanwhile, high temperature wear volume loss of the coating with 2 wt% Y2O3 is about 40% that of the coating without Y2O3. The coating with 2 wt% Y2O3 shows a smoother wear scar and few flat grooves are observed after high temperature wear test.
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