MICROSTRUCTURE AND WEAR RESISTANCE OF CHROMIUM CARBIDE COATINGIN SITUSYNTHESIZED BY VEB

Binfeng Lu (), Liping Li, Fenggui Lu and Xinhua Tang
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Binfeng Lu: School of Mechanical and Automotive Engineering, Jiaxing Vocational Technical College, Jiaxing 314036, 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

Surface Review and Letters (SRL), 2014, vol. 21, issue 05, 1-11

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.

Keywords: Surface composite layer; vacuum electron beam irradiation; in situsynthesis; chromium carbide (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0218625X14500656

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