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Research Papers: Gas Turbines: Industrial and Cogeneration

Field and Laboratory Evaluations of Commercial and Next-Generation Alumina-Forming Austenitic Foil for Advanced Recuperators

[+] Author and Article Information
Bruce A. Pint

Oak Ridge National Laboratory,
Materials Science and Technology Division,
Oak Ridge, TN 37831-6156
e-mail: pintba@ornl.gov

Sebastien Dryepondt, 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 37831-6115

Bo Ruan, Robert D. McKeirnan, Jr

Capstone Turbine Corp.,
Chatsworth, CA 91311

Contributed by the Industrial and Cogeneration Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 12, 2015; final manuscript received May 9, 2016; published online July 19, 2016. Editor: David Wisler.The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.

J. Eng. Gas Turbines Power 138(12), 122001 (Jul 19, 2016) (5 pages) Paper No: GTP-15-1525; doi: 10.1115/1.4033746 History: Received November 12, 2015; Revised May 09, 2016

Alumina-forming austenitic (AFA) steels represent a new class of corrosion- and creep-resistant austenitic steels designed to enable higher temperature recuperators. Field trials are in progress for commercially rolled foil with widths over 39 cm. The first trial completed 3000 hrs in a microturbine recuperator with an elevated turbine inlet temperature and showed limited degradation. A longer microturbine trial is in progress. A third exposure in a larger turbine has passed 16,000 hrs. To reduce alloy cost and address foil fabrication issues with the initial AFA composition, several new AFA compositions are being evaluated in creep and laboratory oxidation testing at 650–800 °C and the results compared to commercially fabricated AFA foil and conventional recuperator foil performance.

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References

Figures

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Fig. 1

Measured Cr depletion from 100 μm alloy 625 foil specimens as a function of exposure temperature in wet air for 6–10 kh [23]

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Fig. 2

Light microscopy of polished cross sections of AFA F4 (a), (c), (e), and (g) 80 μm and (b), (d), (f), and (h) 106 μm foil specimens after 10,000 hrs in wet air at (a) and (b) 650 °C, (c) and (d) 700 °C, (e) and (f) 750 °C, and (g) and (h) 800 °C

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Fig. 3

Summary of creep rupture life and time to 5% strain at 677 °C (1250 °F)/117 MPa and 750 °C (1380 °F)/100 MPa for several commercial alloy foils

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Fig. 4

Folded, crushed, and welded AFA F4 80 μm foil air cell that was assembled into a C65 recuperator

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Fig. 5

Sections of the recuperator removed for analysis

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Fig. 6

Light microscopy of polished cross sections of the 80 μm F4 foil exposed for 3000 hrs in a C65 microturbine recuperator. (a) and (b) show a thin surface oxide with occasional small oxide nodules, while (c) shows large oxide nodules observed in one location.

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Fig. 7

Light microscopy of polished cross sections of the 80 μm alloy 120 foil exposed for 3000 hrs in a C65 microturbine recuperator. Occasional oxide nodules were observed as shown in (c).

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Fig. 8

Specimen mass change for new laboratory AFA foils (∼100 μm thick) compared to commercial AFA F4 foil during 100 hrs cycles in humid air at 700 °C

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Fig. 9

Specimen mass change for new laboratory AFA foils (∼100 μm thick) compared to commercial AFA F4 foil during 100 hrs cycles in humid air at 800 °C

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Fig. 10

Summary of creep rupture life and time to 5% strain at 650 °C/250 MPa and 750 °C/100 MPa for new laboratory AFA ∼100 μm foils compared to commercial 106 μm F4 foil

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