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Influence of Martensitic Transformation on the Durability of TBC Systems (Invited)

[+] Author Affiliations
M. W. Chen, M. L. Glynn, D. Pan, K. T. Ramesh, K. J. Hemker, R. T. Ott, T. C. Hufnagel

Johns Hopkins University, Baltimore, MD

Paper No. IMECE2003-43203, pp. 489-495; 7 pages
doi:10.1115/IMECE2003-43203
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Aerospace
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-3707-6 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Microstructural evolution of bond coat with thermal cycling was characterized with transmission electron microscopy (TEM) and high temperature X-ray diffraction (HT-XRD) analysis. Before thermal cycling, the structure of asfabricated bond coat was confirmed to be a long-range ordered B2 β-phase. After thermal cycling to ∼28% of the cyclic life, the bond coat was found to transform into a Nirich L10 martensite (M) from its original B2 structure. The transformations, M ↔ B2, were demonstrated to be reversible and to occur on heating and cooling in each cycle. Quantitative high temperature XRD measurements verified the phase transformations produce about 0.7 % transformation strain. Finite element calculations incorporating the transformation strain indicate that the mertensitic transformation significantly influences the development of stresses and strains in TBC systems.

Copyright © 2003 by ASME

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