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Residual Stress Measurement of Suspension HVOF-Sprayed Alumina Coating via a Hole-Drilling Method

Owoseni, T. A.; Bai, M.; Curry, N.; Lester, E. H.; Grant, D. M.; Hussain, T.

Authors

T. A. Owoseni

M. Bai

N. Curry

DAVID GRANT david.grant@nottingham.ac.uk
Professor of Materials Science



Abstract

The nature and magnitude of residual stresses in thermal-sprayed coatings determine their lifetime and failure mechanisms. The residual stresses of suspension high-velocity oxy-fuel (SHVOF) thermal sprayed alumina (Al2O3) coating were measured with hole-drilling and x-ray diffraction. The coating is dense and consists of amorphous and two crystalline phases: alpha and gamma. The residual stresses measured by hole-drilling in the Al2O3 coating was − 162 MPa (compression) in the longitudinal direction and − 104 MPa (compression) in the transverse direction. This is due to the peening stress and the high substrate–coating CTE ratio of ~ 2.1. The nature of the residual stress through the coating is related to the microstructure build-up shown from the cross section and the fracture surfaces of the coating.

Journal Article Type Article
Publication Date 2020-08
Journal Journal of Thermal Spray Technology
Print ISSN 1059-9630
Electronic ISSN 1544-1016
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 29
Issue 6
Pages 1339–1350
APA6 Citation Owoseni, T. A., Bai, M., Curry, N., Lester, E. H., Grant, D. M., & Hussain, T. (2020). Residual Stress Measurement of Suspension HVOF-Sprayed Alumina Coating via a Hole-Drilling Method. Journal of Thermal Spray Technology, 29(6), 1339–1350. https://doi.org/10.1007/s11666-020-01072-z
DOI https://doi.org/10.1007/s11666-020-01072-z
Keywords Materials Chemistry; Surfaces, Coatings and Films; Condensed Matter Physics
Publisher URL https://link.springer.com/article/10.1007/s11666-020-01072-z

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