A corrosion- and creep-resistant austenitic stainless steel has been developed for advanced recuperator applications. By optimizing the Al and Cr contents, the alloy is fully austenitic for creep strength while allowing the formation of a chemically stable external alumina scale at temperatures up to . An alumina scale eliminates long-term problems with the formation of volatile Cr oxy-hydroxides in the presence of water vapor in exhaust gas. As a first step in producing foil for primary surface recuperators, three commercially cast heats have been rolled to thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at and , showing excellent creep strength compared with other candidate foil materials. Laboratory exposures in humid air at have shown acceptable oxidation resistance. A similar oxidation behavior was observed for sheet specimens of these alloys exposed in a modified 65 kW microturbine for 2871 h. One composition that showed superior creep and oxidation resistance has been selected for the preparation of a commercial batch of foil.
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e-mail: pintba@ornl.gov
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October 2011
Research Papers
Evaluation of Alumina-Forming Austenitic Foil for Advanced Recuperators
Bruce A. Pint,
Bruce A. Pint
Oak Ridge National Laboratory,
e-mail: pintba@ornl.gov
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
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Michael P. Brady,
Michael P. Brady
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
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Yukinori Yamamoto,
Yukinori Yamamoto
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
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Michael L. Santella,
Michael L. Santella
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
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Philip J. Maziasz,
Philip J. Maziasz
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
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Wendy J. Matthews
Wendy J. Matthews
Capstone Turbine Corporation
, Chatsworth, CA 91311
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Bruce A. Pint
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156e-mail: pintba@ornl.gov
Michael P. Brady
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
Yukinori Yamamoto
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
Michael L. Santella
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
Philip J. Maziasz
Oak Ridge National Laboratory,
Materials Science and Technology Division
, Oak Ridge, TN 37831-6156
Wendy J. Matthews
Capstone Turbine Corporation
, Chatsworth, CA 91311J. Eng. Gas Turbines Power. Oct 2011, 133(10): 102302 (6 pages)
Published Online: May 6, 2011
Article history
Received:
May 27, 2010
Revised:
July 19, 2010
Online:
May 6, 2011
Published:
May 6, 2011
Citation
Pint, B. A., Brady, M. P., Yamamoto, Y., Santella, M. L., Maziasz, P. J., and Matthews, W. J. (May 6, 2011). "Evaluation of Alumina-Forming Austenitic Foil for Advanced Recuperators." ASME. J. Eng. Gas Turbines Power. October 2011; 133(10): 102302. https://doi.org/10.1115/1.4002827
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