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Performance of Wrought Superalloys in Extreme Environments

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Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

As power generation systems move towards higher efficiency operation above 700 ℃, wrought superalloys are the leading structural alloy candidates, including precipitation strengthened (PS) alloys 740 and 282 for the highest temperatures. To evaluate the performance of these alloys for these applications , a range of 500–5000 h evaluations have been conducted in environments including steam , supercritical CO2 (sCO2) and simulated combustion exhaust with H2O and/or SO2 at 700–800 ℃ and compared to baseline exposures in laboratory air and 1 bar CO2. These alloys primarily rely on the formation of an external Cr-rich oxide layer or scale for environmental protection and the reaction rates in all of these conditions are similar and relatively low. However, compared to a conventional solid solution strengthened alloy, like 625, the mass gains are higher for PS alloys due to the internal oxidation of the γ′ forming additions, Al and Ti . Post-exposure characterization has quantified the reaction products and the depth of internal oxidation is not a concern and does not appear to increase above the baseline behavior in laboratory air. Likewise, there is no indication of internal carburization in the sCO2 environment at 750 ℃/300 bar. The addition of 0.1% SO2 in CO2-10% H2O at 800 ℃ actually suppressed the internal oxidation at 1 bar but SO2 may be a concern when the total pressure is higher.

Notice: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

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Acknowledgements

The 700–750 ℃ steam oxidation extracted from ORNL projects led by I. G. Wright. The current experimental work was conducted by M. Lance (GDOES), M. Stephens, M. Howell, T. Lowe, G. Garner and T. Jordan. S. S. Raiman and J. Jun provided useful comments on the manuscript. This research was funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technology Program (SunShot Initiative) and by the Office of Fossil Energy, Crosscutting Research Program.

Author information

Authors and Affiliations

  1. Oak Ridge National Laboratory, 2008, Oak Ridge, TN, 37831-6156, USA

    B. A. Pint

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  1. B. A. Pint
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Correspondence to B. A. Pint .

Editor information

Editors and Affiliations

  1. General Electric, Cincinnati, Ohio, USA

    Eric Ott

  2. West Virginia University, Morgantown, West Virginia, USA

    Xingbo Liu

  3. University West, Trollhättan, Sweden

    Joel Andersson

  4. China Iron and Steel Research Institute, Beijing, China

    Zhongnan Bi

  5. ‎ATI Specialty Materials, Monroe, North Carolina, USA

    Kevin Bockenstedt

  6. Wyman Gordon Forgings Inc., Houston, Texas, USA

    Ian Dempster

  7. General Electric, Cincinnati, Ohio, USA

    Jon Groh

  8. Carpenter Technology, Philadelphia, Pennsylvania, USA

    Karl Heck

  9. United States Department of Energy, Albany, New York, USA

    Paul Jablonski

  10. Pratt & Whitney, East Hartford, Connecticut, USA

    Max Kaplan

  11. Honda Motor Co. Ltd., Saitama, Japan

    Daisuke Nagahama

  12. QuesTek Innovations, Evanston, Illinois, USA

    Chantal Sudbrack

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Pint, B.A. (2018). Performance of Wrought Superalloys in Extreme Environments. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_9

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