In order to increase the efficiency of advanced microturbines, durable alloy foils are needed for their recuperators to operate at . Prior work has demonstrated that water vapor in the exhaust gas causes more rapid consumption of Cr from austenitic alloys, leading to a reduction in lifetime for the thin-walled components in this application. New commercial alloy foils are being tested in both laboratory tests in humid air and in the exhaust gas of a modified microturbine. Initial results are presented for a commercial batch of alloy 120 foil. The Cr consumption rates in laboratory testing were similar to those observed in previous testing. The initial results from the microturbine indicate a faster Cr consumption rate compared to the laboratory test, but longer term results are needed to quantify the difference. These results will help to verify a Cr consumption model for predicting lifetimes in this environment based on classical gas transport theory.
Comparison of Recuperator Alloy Degradation in Laboratory and Engine Testing
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Pint, B. A., More, K. L., Trejo, R., and Lara-Curzio, E. (December 13, 2007). "Comparison of Recuperator Alloy Degradation in Laboratory and Engine Testing." ASME. J. Eng. Gas Turbines Power. January 2008; 130(1): 012101. https://doi.org/10.1115/1.2436565
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