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.
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ASME 2003 International Mechanical Engineering Congress and Exposition
November 15–21, 2003
Washington, DC, USA
Conference Sponsors:
- Aerospace Division
ISBN:
0-7918-3707-6
PROCEEDINGS PAPER
Influence of Martensitic Transformation on the Durability of TBC Systems (Invited)
M. W. Chen,
M. W. Chen
Johns Hopkins University, Baltimore, MD
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M. L. Glynn,
M. L. Glynn
Johns Hopkins University, Baltimore, MD
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K. T. Ramesh,
K. T. Ramesh
Johns Hopkins University, Baltimore, MD
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K. J. Hemker,
K. J. Hemker
Johns Hopkins University, Baltimore, MD
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R. T. Ott,
R. T. Ott
Johns Hopkins University, Baltimore, MD
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T. C. Hufnagel
T. C. Hufnagel
Johns Hopkins University, Baltimore, MD
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M. W. Chen
Johns Hopkins University, Baltimore, MD
M. L. Glynn
Johns Hopkins University, Baltimore, MD
D. Pan
Johns Hopkins University, Baltimore, MD
K. T. Ramesh
Johns Hopkins University, Baltimore, MD
K. J. Hemker
Johns Hopkins University, Baltimore, MD
R. T. Ott
Johns Hopkins University, Baltimore, MD
T. C. Hufnagel
Johns Hopkins University, Baltimore, MD
Paper No:
IMECE2003-43203, pp. 489-495; 7 pages
Published Online:
May 12, 2008
Citation
Chen, MW, Glynn, ML, Pan, D, Ramesh, KT, Hemker, KJ, Ott, RT, & Hufnagel, TC. "Influence of Martensitic Transformation on the Durability of TBC Systems (Invited)." Proceedings of the ASME 2003 International Mechanical Engineering Congress and Exposition. Aerospace. Washington, DC, USA. November 15–21, 2003. pp. 489-495. ASME. https://doi.org/10.1115/IMECE2003-43203
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