(Fe,Cr)7C3/Fe surface gradient composite: Microstructure,microhardness, and wear resistance |
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| Authors: | Fangxia Ye Mirabbos Hojamberdiev Yunhua Xu Lisheng Zhong Honghua Yan Zhe Chen |
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| Affiliation: | 1. School of Materials Science and Engineering, Xi''an University of Technology, Xi''an 710048, PR China;2. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226-8503, Japan;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, PR China;4. Institute of Wear Resistant Materials, Xi''an University of Architecture and Technology, Xi''an 710055, PR China |
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| 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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| Keywords: | A Composite materials B Heat treatment C Electron diffraction C Electron microscopy C Hardness D Wear |
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