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

M. W. 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
Externally publishedYes
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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