The University of Southampton
University of Southampton Institutional Repository

The development of sub-surface damage during high energy solid particle erosion of a thermally sprayed WC-C0-Cr coating

The development of sub-surface damage during high energy solid particle erosion of a thermally sprayed WC-C0-Cr coating
The development of sub-surface damage during high energy solid particle erosion of a thermally sprayed WC-C0-Cr coating
The erosion wear performance of a thermally sprayed hard coating has been found to be inferior to that of sintered bulk material of the same composition. The anisotropic microstructure of thermally sprayed WC–Co–Cr coatings, in particular the low fracture toughness in a direction parallel to the substrate, i.e. parallel to the long side of the splats that make up the thermal spray coating has been observed to affect the nature of crack formation both in indentation testing and under high energy solid particle erosion conditions. The present work quantifies the number and length of cracks found, both parallel and transverse to the substrate boundary, in eroded samples of thermally sprayed WC–Co–Cr material. The initiation sites of these cracks are also studied and the importance of voids and other microstructural features (i.e. cobalt lakes, splat boundaries, interfacial inclusions) in the coating as initiation sites is highlighted. Dynamic Hertzian impact theory is used to estimate the elastic contact stresses and sub-surface shear stresses induced by solid particle impacts as well as to infer likely zones of plasticity. These stress fields are related to the location of cracks and to possible mechanisms for crack propagation. The cracks appear in near-surface layers that are likely regions of localised plasticity in the matrix and could result from a mixed mode of ductile fractures driven by plastic strain accumulated after multiple solid impacts as well as fractures driven by elastic stress intensity primarily dominated by sub-surface shear stresses and surface tensile stresses.
WC–Co–Cr, coating, erosion, cracks
0043-1648
125-134
Barber, J.
a130af2c-9cc2-42f5-8a2b-0febcbdc6e2c
Mellor, B.G.
2b13b80f-880b-49ac-82fe-827a15dde2fe
Wood, R.J.K.
8824ab38-4508-41d1-a5bb-2fe37931424a
Barber, J.
a130af2c-9cc2-42f5-8a2b-0febcbdc6e2c
Mellor, B.G.
2b13b80f-880b-49ac-82fe-827a15dde2fe
Wood, R.J.K.
8824ab38-4508-41d1-a5bb-2fe37931424a

Barber, J., Mellor, B.G. and Wood, R.J.K. (2005) The development of sub-surface damage during high energy solid particle erosion of a thermally sprayed WC-C0-Cr coating. Wear, 259 (1-6), 125-134. (doi:10.1016/j.wear.2005.02.008).

Record type: Article

Abstract

The erosion wear performance of a thermally sprayed hard coating has been found to be inferior to that of sintered bulk material of the same composition. The anisotropic microstructure of thermally sprayed WC–Co–Cr coatings, in particular the low fracture toughness in a direction parallel to the substrate, i.e. parallel to the long side of the splats that make up the thermal spray coating has been observed to affect the nature of crack formation both in indentation testing and under high energy solid particle erosion conditions. The present work quantifies the number and length of cracks found, both parallel and transverse to the substrate boundary, in eroded samples of thermally sprayed WC–Co–Cr material. The initiation sites of these cracks are also studied and the importance of voids and other microstructural features (i.e. cobalt lakes, splat boundaries, interfacial inclusions) in the coating as initiation sites is highlighted. Dynamic Hertzian impact theory is used to estimate the elastic contact stresses and sub-surface shear stresses induced by solid particle impacts as well as to infer likely zones of plasticity. These stress fields are related to the location of cracks and to possible mechanisms for crack propagation. The cracks appear in near-surface layers that are likely regions of localised plasticity in the matrix and could result from a mixed mode of ductile fractures driven by plastic strain accumulated after multiple solid impacts as well as fractures driven by elastic stress intensity primarily dominated by sub-surface shear stresses and surface tensile stresses.

Full text not available from this repository.

More information

Published date: 2005
Additional Information: 15th International Conference on Wear of Materials
Keywords: WC–Co–Cr, coating, erosion, cracks

Identifiers

Local EPrints ID: 23214
URI: https://eprints.soton.ac.uk/id/eprint/23214
ISSN: 0043-1648
PURE UUID: bee60ad3-3399-48b0-a4d3-840637a6da01

Catalogue record

Date deposited: 14 Mar 2006
Last modified: 17 Jul 2017 16:18

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×