Evaluation of Alumina-Forming Austenitic Stainless Steel Alloys in Microturbines

Technical Report · Wed Sep 15 04:00:00 EDT 2010

DOI:https://doi.org/10.2172/988341· OSTI ID:988341

Brady, M P; Matthews, W J ^[1]

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1. Capstone Turbine Corp.

Oak Ridge National Laboratory (ORNL) and Capstone Turbine Corporation (CTC) participated in an in-kind cost share cooperative research and development agreement (CRADA) effort under the auspices of the Energy Efficiency and Renewable Energy (EERE) Technology Maturation Program to explore the feasibility for use of developmental ORNL alumina-forming austenitic (AFA) stainless steels as a material of construction for microturbine recuperator components. ORNL delivered test coupons of three different AFA compositions to CTC. The coupons were exposed in steady-state elevated turbine exit temperature (TET) engine testing, with coupons removed for analysis after accumulating ~1,500, 3,000, 4,500, and 6,000 hours of operation. Companion test coupons were also exposed in oxidation testing at ORNL at 700-800°C in air with 10% H2O. Post test assessment of the coupons was performed at ORNL by light microscopy and electron probe microanalysis. The higher Al and Nb containing AFA alloys exhibited excellent resistance to oxidation/corrosion, and thus show good promise for recuperator applications.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy (EE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 988341
• Report Number(s): NFE-08-01392
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALLOYS
CONSTRUCTION
ELECTRON PROBES
ENERGY EFFICIENCY
ENGINES
EVALUATION
MICROANALYSIS
MICROSCOPY
ORNL
OXIDATION
STAINLESS STEELS
TESTING
TURBINES