Abstract
In this study, the (Fe,Cr)7C3/Fe surface gradient composite was produced by in situ synthesis process with subsequent heat treatment. According to the results of thermal analysis, the as-cast specimen was subjected to heat treatment at 1180 °C for 3 h in argon atmosphere. The phase composition, microstructure, microhardness, and wear resistance of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness tester, and wear resistance tester, respectively. The XRD results show that α-Fe and (Fe,Cr)7C3 are the predominant crystalline phases in the composite obtained. The volume fraction of (Fe,Cr)7C3 particulates has a gradient distribution from the surface to the matrix, and the morphology of (Fe,Cr)7C3 particulates changes considerably. A dense ceramic layer is formed on the upper surface of (Fe,Cr)7C3/Fe surface gradient composite with a volume fraction of 90%. The microhardness of the dense ceramic layer is 1484 HV0.1, and its relative wear resistance is five times higher than that of the iron matrix.
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