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

Mingwei Chen, M. L. Glynn, D. Pan, K. T. Ramesh, K. J. Hemker, R. T. Ott, T. C. Hufnage

    Research output: Contribution to journalConference articlepeer-review

    1 Citation (Scopus)

    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 martensitic transformation significantly influences the development of stresses and strains in TBC systems.

    Original languageEnglish
    Pages (from-to)489-495
    Number of pages7
    JournalAmerican Society of Mechanical Engineers, Aerospace Division (Publication) AD
    Volume68
    DOIs
    Publication statusPublished - 2003 Jan 1
    Event2003 ASME International Mechanical Engineering Congress - Washington, DC., United States
    Duration: 2003 Nov 152003 Nov 21

    Keywords

    • Bond coat
    • Martensitic transformation
    • Thermal barrier coatings (TBCs)
    • Transformation strain

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Space and Planetary Science

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