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FIB-SEM Sectioning Study of Decarburization Products in the Microstructure of HVOF-Sprayed WC-Co Coatings

Katranidis, Vasileios, Gu, Sai, Cox, David, Whiting, Mark J and Kamnis, Spyros (2018) FIB-SEM Sectioning Study of Decarburization Products in the Microstructure of HVOF-Sprayed WC-Co Coatings Journal of Thermal Spray Technology, 27 (5). pp. 898-908.

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Abstract

The thermal dissolution and decarburization of WC-based powders that occur in various spray processes are a widely studied phenomenon, and mechanisms that describe its development have been proposed. However, the exact formation mechanism of decarburization products such as metallic W is not yet established. A WC-17Co coating is sprayed intentionally at an exceedingly long spray distance to exaggerate the decarburization effects. Progressive xenon plasma ion milling of the examined surface has revealed microstructural features that would have been smeared away by conventional polishing. Serial sectioning provided insights on the three-dimensional structure of the decarburization products. Metallic W has been found to form a shell around small splats that did not deform significantly upon impact, suggesting that its crystallization occurs during the in-flight stage of the particles. W2C crystals are more prominent on WC faces that are in close proximity with splat boundaries indicating an accelerated decarburization in such sites. Porosity can be clearly categorized in imperfect intersplat contact and oxidation-generated gases via its shape.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Katranidis, Vasileiosv.katranidis@surrey.ac.uk
Gu, Saisai.gu@surrey.ac.uk
Cox, DavidD.Cox@surrey.ac.uk
Whiting, Mark JM.Whiting@surrey.ac.uk
Kamnis, Spyros
Date : 1 May 2018
Funders : EPSRC
DOI : 10.1007/s11666-018-0721-3
Copyright Disclaimer : © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Uncontrolled Keywords : decarburization ; properties focused ion beam ; testing HVOF ;  processing imaging ; processing wear-resistant coatings ; applications WC-Co ;  feedstock
Depositing User : Melanie Hughes
Date Deposited : 21 Sep 2018 16:39
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/849412

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