Haynes alloy HR-120 (Haynes and HR-120 are trademarks of Haynes International, Inc.) forms a protective oxide scale when exposed to the harsh operating environment of a microturbine primary surface recuperator. Primary surface recuperators manufactured from HR-120 are currently in use on the Capstone C65 MicroTurbine (MicroTurbine is a registered trademark of Capstone Turbine Corporation). Long-term microturbine tests of this alloy are currently being conducted at an elevated turbine exit temperature ( higher than that in a normal operation) at Capstone Turbine Corporation. Alloy samples that have been tested under steady-state microturbine operating conditions are removed after predetermined exposure intervals for characterization by Capstone Turbine Corporation in collaboration with Oak Ridge National Laboratory. Such evaluations include the characterization of surface oxide scales and the associated alloy compositional changes following a steady-state operation ranging from 1800 h to 14,500 h. Results from the microstructural and compositional analyses of these long-term steady-state engine-tested HR-120 samples are used to illustrate the progression of alloy oxidation in the microturbine operating environment.
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Long-Term Microturbine Exposure of an Advanced Alloy for Microturbine Primary Surface Recuperators
Wendy J. Matthews,
Wendy J. Matthews
Capstone Turbine Corporation
, Chatsworth, CA 91311
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Karren L. More,
Karren L. More
Oak Ridge National Laboratory
, Oak Ridge, TN 37831
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Larry R. Walker
Larry R. Walker
Oak Ridge National Laboratory
, Oak Ridge, TN 37831
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Wendy J. Matthews
Capstone Turbine Corporation
, Chatsworth, CA 91311
Karren L. More
Oak Ridge National Laboratory
, Oak Ridge, TN 37831
Larry R. Walker
Oak Ridge National Laboratory
, Oak Ridge, TN 37831J. Eng. Gas Turbines Power. May 2009, 131(3): 032301 (6 pages)
Published Online: February 6, 2009
Article history
Received:
March 28, 2008
Revised:
April 8, 2008
Published:
February 6, 2009
Citation
Matthews, W. J., More, K. L., and Walker, L. R. (February 6, 2009). "Long-Term Microturbine Exposure of an Advanced Alloy for Microturbine Primary Surface Recuperators." ASME. J. Eng. Gas Turbines Power. May 2009; 131(3): 032301. https://doi.org/10.1115/1.2966419
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