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A CTC P -NiCrBSi/heat resistant steel composite layer was designed and fabricated by vacuum fusion sintering. The structure of the composite layer was similar to reinforced concrete. Numerous reinforced regions with a cylindrical shape were evenly distributed in the heat resistant steel. Modified cast tungsten carbide particles (CTC P ) reinforced NiCrBSi matrix composite constituted the reinforced region (CTC P -NiCrBSi). The microstructure of the composite layers was investigated by scanning electron microscope (SEM), energy dispersive x-ray spectrometer (EDS), and image analysis. The wear behavior of the composite layer was estimated on the ring-on-disc rig at a temperature range of room temperature (RT) to 800 °C in air. The microstructure and wear behavior of the composite layer with modified CTC P were compared with those with primary CTC P . The results showed that the poor chemical resistance of W₂C and the interdiffusion of elements were responsible for the dissolution of unmodified CTC P in the molten NiCrBSi alloy. A WC outer shell formed on the surface of the CTC P after surface carburizing modification. The WC outer shell could effectively resist the dissolution of CTC P in NiCrBSi during the sintering process. The content of WC/W₂C in modified CTC P -NiCrBSi increased by about 12.0 vol. % when compared with that in the primary CTC P -NiCrBSi. The wear rate of the composite layer with modified CTC P was lower than that with primary CTC P between RT and 700 °C. The wear rates of the composite layer decreased with increasing temperature from RT to 700 °C and increased above 700 °C.

Effects of CTCP Modification on Microstructure and Wear Behavior of CTCP-NiCrBSi/Heat Resistant Steel Composite Layer