Startseite The microstructure and three-point bending behavior of Ni–Co/WC composite cladding coating
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The microstructure and three-point bending behavior of Ni–Co/WC composite cladding coating

  • Guirong Yang , Wenming Song , Jian Li , Fuqiang Wang , Ying Ma und Yuan Hao
Veröffentlicht/Copyright: 3. April 2019
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Abstract

Ni–Co/WC composite coating was fabricated on ZG45 steel substrate through vacuum sintering cladding technology. Its microstructure, composition, and three-point bending behavior were analyzed through scanning electron microscopy, electron probe microanalysis, X-ray diffraction, and mechanical testing. Results show that the distribution of WC particles presents a 3D net-like shape. A metallurgical fusion area is observed at the interface between the composite coating and the substrate. The entire coating consists of a composite coating area, a transition area, and a diffusion fusion area. The main phases of the coating are WC, Cr7C3, Cr23C6, Ni3Si, FeNi3, and Ni–Co solid solution. Three-point bending results reveal that the softness coefficient of the whole sample when the composite coating was in a compressive stress state was larger than that when the composite coating was in a tensile stress state. The bending strength of the sample is 520 MPa when the composite coating is in a compressive stress state. This value is 66 % higher than that when the composite coating is located at the bottom. The cracks simultaneously extend to the substrate and interface when the composite coating was in a compressive stress state and to the substrate when the composite coating was in a tensile stress state. The fracture of the composite area is brittle, and the substrate fracture is ductile.


Correspondence address, Prof. Guirong Yang, School of Materials Science & Technology, State Key Lab of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 287 Langongping Road, Lanzhou 730050, P.R. China, Tel: +86-931-2973563, Fax: +86-931-2976578, e-mail:

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Received: 2018-07-05
Accepted: 2018-10-26
Published Online: 2019-04-03
Published in Print: 2018-04-12

© 2019, Carl Hanser Verlag, München

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