Systematic investigation of residual strains associated with WC-Co coatings thermal sprayed onto metal substrates

Journal article

Authors/Editors

Oladijo, Philip

Research Areas

ENGINEERING AND TECHNOLOGY (Frascati classification)

Publication Details

Subtitle: Systematic investigation of residual strains associated with WC-Co coatings thermal sprayed onto metal substrates

Author list:
Oladijo, Philip

Publisher: Elsevier

Publication year: 2012

Journal: Surface and Coatings Technology (0257-8972)

Volume number: 206

Issue number: 19-20

Start page: 4011

End page: 4020

Number of pages: 10

ISSN: 0257-8972

Languages: English-United States (EN-US)

Abstract

Using penetrating high-energy synchrotron X-ray radiation and thermal neutrons, the residual strains and stresses associated with the high-velocity oxygen-fuel (HVOF) thermal spray coating of WC-Co on two different substrate materials with significantly different coefficients of thermal expansion (CTE) to that of the coating material, have been investigated in a systematic approach. This approach enabled quantification of the residual strain and stress contributions that emanate from the different processing steps associated with the coating process. An eigenstrain approach enabled direct comparison of the contributions of the different processing steps to the plastic strains. It is shown that the dominant contribution originates from the grit-blast surface preparation step. Contributions purely from the coating process are not distinguishable from that of the grit blasting process within the measurement accuracy. For the as-coated samples no obvious contributions ascribable to the differences in the CTEs of the substrates, or impact related effects are observed. (c) 2012 Elsevier B.V. All rights reserved.

Keywords

Residual strainsWC–Co coatingsNeutron diffractionSynchrotron X-raysHigh-velocity oxygen-fuelEigenstrain

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