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The influence of a martensitic phase transformation on stress development in thermal barrier coating systems

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Abstract

Thermal barrier coatings (TBCs) provide thermal insulation and oxidation protection of Ni-base superalloys in elevated temperature turbine applications. Thermal barrier coating failure is caused by spallation, which is related to the development of internal stresses during thermal cycling. Recent microstructural observations have highlighted the occurrence of a martensitic bond coat transformation, and this finite-element analysis was conducted to clarify the influence of the martensite on the development of stresses and strains in the multilayered system during thermal cycling. Simulations incorporating the volume change associated with the transformation and experimentally measured coating properties indicate that out-of-plane top coat stresses are greatly influenced by the presence of the martensitic transformation, the temperature at which it occurs relative to the strength of the bond coat and attendant bond coat plasticity. Intermediate values of bond coat strength and transformation temperatures are shown to result in the highest top coat stresses.

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Authors and Affiliations

  1. the Department of Mechanical Engineering, Johns Hopkins University, 212818, Baltimore, MD

    M. L. Glynn (Graduate Student), M. W. Chen (Research Scientist), K. T. Ramesh (Professor) & K. J. Hemker (Professor)

Authors
  1. M. L. Glynn
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  2. M. W. Chen
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  3. K. T. Ramesh
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  4. K. J. Hemker
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Additional information

This article is based on a presentation in the symposium “Terence E. Mitchell Symposium on the Magic of Materials: Structures and Properties” from the TMS Annual Meeting in San Diego, CA in March 2003.

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Glynn, M.L., Chen, M.W., Ramesh, K.T. et al. The influence of a martensitic phase transformation on stress development in thermal barrier coating systems. Metall Mater Trans A 35, 2279–2286 (2004). https://doi.org/10.1007/s11661-006-0207-7

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  • DOI: https://doi.org/10.1007/s11661-006-0207-7

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