Comparison the Effect of Nb, Ti, and V on the Wear Resistance of Fe-Cr-C Overlays

Three types of Fe-Cr-C overlays with the addition of Nb, Ti, and V with similar mole quantity are fabricated by button melting method and characterized by optical microscopy (OM), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The overlays have shown a similar microstructure with the primary MC carbides forming first during solidification followed by the eutectic components of austenite and M₇C₃ carbides. The microhardness and pin-on-disc wear tests of each overlay have been investigated to compare the wear resistance of overlays consisting of different primary carbides. ThermoCalc simulation results are also discussed on the formation of MC carbides.