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 900°C. 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 ∼100μm thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at 675° and 750°C showing excellent creep strength compared to other candidate foil materials. Laboratory exposures in humid air at 650°-800°C have shown acceptable oxidation resistance. Similar oxidation behavior was observed for sheet specimens of these alloys exposed in a modified 65kW microturbine for 2,871h. One composition that showed superior creep and oxidation resistance has been selected for preparation of a commercial batch of foil.
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ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4400-7
PROCEEDINGS PAPER
Evaluation of Alumina-Forming Austenitic Foil for Advanced Recuperators
Bruce A. Pint,
Bruce A. Pint
Oak Ridge National Laboratory, Oak Ridge, TN
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Michael P. Brady,
Michael P. Brady
Oak Ridge National Laboratory, Oak Ridge, TN
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Yukinori Yamamoto,
Yukinori Yamamoto
Oak Ridge National Laboratory, Oak Ridge, TN
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Michael L. Santella,
Michael L. Santella
Oak Ridge National Laboratory, Oak Ridge, TN
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Philip J. Maziasz,
Philip J. Maziasz
Oak Ridge National Laboratory, Oak Ridge, TN
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Wendy J. Matthews
Wendy J. Matthews
Capstone Turbine Corp., Chatsworth, CA
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Bruce A. Pint
Oak Ridge National Laboratory, Oak Ridge, TN
Michael P. Brady
Oak Ridge National Laboratory, Oak Ridge, TN
Yukinori Yamamoto
Oak Ridge National Laboratory, Oak Ridge, TN
Michael L. Santella
Oak Ridge National Laboratory, Oak Ridge, TN
Philip J. Maziasz
Oak Ridge National Laboratory, Oak Ridge, TN
Wendy J. Matthews
Capstone Turbine Corp., Chatsworth, CA
Paper No:
GT2010-23003, pp. 487-494; 8 pages
Published Online:
December 22, 2010
Citation
Pint, BA, Brady, MP, Yamamoto, Y, Santella, ML, Maziasz, PJ, & Matthews, WJ. "Evaluation of Alumina-Forming Austenitic Foil for Advanced Recuperators." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 5: Industrial and Cogeneration; Microturbines and Small Turbomachinery; Oil and Gas Applications; Wind Turbine Technology. Glasgow, UK. June 14–18, 2010. pp. 487-494. ASME. https://doi.org/10.1115/GT2010-23003
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