Long-Term Microturbine Exposure of an Advanced Alloy for Microturbine Primary Surface Recuperators

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Journal of Engineering for Gas Turbines & Power

DOI:https://doi.org/10.1115/1.2966419· OSTI ID:973539

Matthews, Wendy ^[1]; More, Karren Leslie ^[2]; Walker, Larry R ^[2]

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1. Capstone Turbines
2. ORNL

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 ({approx}100 F 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.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Temperature Materials Laboratory
• Sponsoring Organization: EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 973539
• Journal Information: Journal of Engineering for Gas Turbines & Power, Journal Name: Journal of Engineering for Gas Turbines & Power Journal Issue: 3 Vol. 131; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
HAYNES ALLOYS
ORNL
OXIDATION
OXIDES
TURBINES