Relationship between microstructural evolution and wear behaviour of in-situ Fe3W3C particles reinforced iron matrix composites

This study systematically investigates the microstructural characteristics, interfacial bonding mechanisms, mechanical properties, and wear behavior of Fe₃W₃C -reinforced high-chromium cast iron matrix composites fabricated through combined powder metallurgy and casting techniques. Microstructural analysis revealed the uniform distribution of two distinct Fe₃W₃C morphologies - faceted and herringbone structures - along the composite interface, formed through in-situ reaction-driven diffusion of W and C atoms. Notably, the exothermic phase transformation reaction facilitated directional growth of carbide phases within the matrix, resulting in a 11.2 % enhancement in interfacial microhardness compared to the base material. During three-body abrasive wear testing, the composite demonstrated superior wear resistance characterized by shallow surface abrasions, contrasting with the pronounced ploughing grooves and material removal observed in unreinforced high-chromium cast iron. Quantitative analysis showed an 83.3 % improvement in relative wear resistance for the composite material. These findings establish Fe₃W₃C as an effective reinforcement phase for metal matrix composites, demonstrating significant potential for industrial applications requiring enhanced wear resistance.