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Residual stresses in environmental and thermal barrier coatings on curved superalloy substrates: experimental measurements and modelling

Liu, D.; Kyaw, S.T.; Flewitt, P.E.J.; Seraffon, M.; Simms, N.J.; Pavier, M.; Jones, I.A.

Authors

D. Liu

S.T. Kyaw

P.E.J. Flewitt

M. Seraffon

N.J. Simms

M. Pavier

I.A. Jones arthur.jones@nottingham.ac.uk



Abstract

Residual stresses within thermal barrier coated (TBC) systems are predicted using finite element models and are compared against experimental measurements taken using Raman and photo-stimulated luminescence piezo-spectroscopic methods. Two types of specimens were considered: flat specimens without TBC, and aerofoil shaped specimens with TBC. Comparisons between model predictions and experimentally measured stresses and also the relationship between substrate curvature and residual stresses on subsequent spallation of the aerofoil specimen were made. For the flat specimen, predicted and measured residual stresses are of the same order of magnitude. Both studies have indicated that larger compressive residual stresses arise from higher substrate curvatures. The results improve the understanding of initiation and propagation of TBC cracks which occurs preferentially at locations with high substrate convex curvature.

Journal Article Type Article
Publication Date Jun 12, 2014
Journal Materials Science and Engineering: A
Print ISSN 0921-5093
Electronic ISSN 0921-5093
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 606
APA6 Citation Liu, D., Kyaw, S., Flewitt, P., Seraffon, M., Simms, N., Pavier, M., & Jones, I. (2014). Residual stresses in environmental and thermal barrier coatings on curved superalloy substrates: experimental measurements and modelling. Materials Science and Engineering: A, 606, doi:10.1016/j.msea.2014.03.014
DOI https://doi.org/10.1016/j.msea.2014.03.014
Publisher URL http://www.sciencedirect.com/science/article/pii/S0921509314002731
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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