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Title: Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays

Abstract

This paper presents findings of synchrotron diffraction measurements on tubular specimens with a thermal barrier coating (TBC) system applied by electron beam physical vapor deposition (EB-PVD), having a thermally grown oxide (TGO) layer due to aging in hot air. The diffraction measurements were in situ while applying a thermal cycle with high temperature holds at 1000 °C and varying internal air cooling mass flow and mechanical load. It was observed that, during high temperature holds at 1000 °C, the TGO strain approached zero if no mechanical load or internal cooling was applied. When applying a mechanical load, the TGO in-plane strain (e22) changed to tensile and the out of plane TGO strain (e11) became compressive. The addition of internal cooling induced a thermal gradient, yielding a competing effect, driving the e22 strain to compressive and e11 strain to tensile. Quantifying TGO strain variations in response to competing factors will provide a path to controlling the TGO strain, and further improving the lifetime assessment and durability design strategies for TBC systems.

Authors:
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [2]; ORCiD logo [1]
  1. Univ. of Central Florida, Orlando, FL (United States)
  2. Institute of Materials Research, Linder Höhe, Köln (Germany)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Cleveland State University, OH (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); German Research Foundation (DFG)
OSTI Identifier:
1493726
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Coatings
Additional Journal Information:
Journal Volume: 8; Journal Issue: 9; Journal ID: ISSN 2079-6412
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; synchrotron; thermal barrier coatings; thermal gradient mechanical load

Citation Formats

Manero, Albert, Knipe, Kevin, Wischek, Janine, Meid, Carla, Okasinski, John, Almer, Jonathan, Karlsson, Anette, Bartsch, Marion, and Raghavan, Seetha. Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays. United States: N. p., 2018. Web. doi:10.3390/coatings8090320.
Manero, Albert, Knipe, Kevin, Wischek, Janine, Meid, Carla, Okasinski, John, Almer, Jonathan, Karlsson, Anette, Bartsch, Marion, & Raghavan, Seetha. Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays. United States. doi:10.3390/coatings8090320.
Manero, Albert, Knipe, Kevin, Wischek, Janine, Meid, Carla, Okasinski, John, Almer, Jonathan, Karlsson, Anette, Bartsch, Marion, and Raghavan, Seetha. Mon . "Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays". United States. doi:10.3390/coatings8090320. https://www.osti.gov/servlets/purl/1493726.
@article{osti_1493726,
title = {Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays},
author = {Manero, Albert and Knipe, Kevin and Wischek, Janine and Meid, Carla and Okasinski, John and Almer, Jonathan and Karlsson, Anette and Bartsch, Marion and Raghavan, Seetha},
abstractNote = {This paper presents findings of synchrotron diffraction measurements on tubular specimens with a thermal barrier coating (TBC) system applied by electron beam physical vapor deposition (EB-PVD), having a thermally grown oxide (TGO) layer due to aging in hot air. The diffraction measurements were in situ while applying a thermal cycle with high temperature holds at 1000 °C and varying internal air cooling mass flow and mechanical load. It was observed that, during high temperature holds at 1000 °C, the TGO strain approached zero if no mechanical load or internal cooling was applied. When applying a mechanical load, the TGO in-plane strain (e22) changed to tensile and the out of plane TGO strain (e11) became compressive. The addition of internal cooling induced a thermal gradient, yielding a competing effect, driving the e22 strain to compressive and e11 strain to tensile. Quantifying TGO strain variations in response to competing factors will provide a path to controlling the TGO strain, and further improving the lifetime assessment and durability design strategies for TBC systems.},
doi = {10.3390/coatings8090320},
journal = {Coatings},
number = 9,
volume = 8,
place = {United States},
year = {2018},
month = {9}
}

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Cited by: 1 work
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Figures / Tables:

Figure 1 Figure 1: (a) view of specimen with attached thermocouple placed in furnace and schematic of experimental methodology with nomenclature of determined strain. (b) Multivariable matrix for Case 1 (constant load, variable flow in standard liters per minute), Case 2 (constant flow, varying mechanical loading), and Case 3 (extrema loading conditions).

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.