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Microstructure And Wear Resistance Of Chromium Carbide Coatingin Situsynthesized By Veb

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  • BINFENG LU

    (School of Mechanical and Automotive Engineering, Jiaxing Vocational Technical College, Jiaxing 314036, P. R. China;
    College of Electrical Engineering, Zhejiang University, Hangzhou 310027, P. R. China)

  • LIPING LI

    (School of Mechanical and Automotive Engineering, Jiaxing Vocational Technical College, Jiaxing 314036, P. R. China)

  • FENGGUI LU

    (College of Material Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China)

  • XINHUA TANG

    (College of Material Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China)

Abstract

In this paper,(Cr,Fe)7C3(M7C3)/γ-Fecomposite layer has beenin situfabricated on a low carbon steel surface by vacuum electron beam irradiation (VEB). Three kinds of powder mixtures were placed on a low carbon steel substrate, which was then irradiated with electron beam in vacuum condition. The microstructure and wear resistance of the composite layers has been studied by means of optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), microhardness tester and tribological tester. The chemical composition of all specimens were carefully analyzed using energy-dispersive X-ray spectroscopy (EDAX) technique. Depending on three different powder mixtures, hypereutectic and hypoeutectic microstructures were obtained on surface composite layers. No pores and cracks were found on the coatings. The amount of carbides formed in the surface composite layer was mainly determined by carbon concentration. The microstructure close to the fusion line was largely primary austenite dendrite. The hardness and wear resistance of the surface composite layer has been greatly improved due to the extensive distribution of carbides.

Suggested Citation

  • Binfeng Lu & Liping Li & Fenggui Lu & Xinhua Tang, 2014. "Microstructure And Wear Resistance Of Chromium Carbide Coatingin Situsynthesized By Veb," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 21(05), pages 1-11.
    • Handle: RePEc:wsi:srlxxx:v:21:y:2014:i:05:n:s0218625x14500656
    DOI: 10.1142/S0218625X14500656
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