Evaluation of Alumina-Forming Austenitic Stainless Steel Alloys in Microturbines

Brady, M.P. ; Matthews, W.J. (Capstone Turbine Corp.)

Oak Ridge National Laboratory

关键词: Oxidation;    Alloys;    Microanalysis;    Air;    Engines;   

DOI  :  10.2172/988341
RP-ID  :  NFE-08-01392
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  988341

美国|英语

来源: UNT Digital Library

【 摘 要 】

Oak Ridge National Laboratory (ORNL) and Capstone Turbine Corporation (CTC) participatedin an in-kind cost share cooperative research and development agreement (CRADA) effort underthe auspices of the Energy Efficiency and Renewable Energy (EERE) Technology MaturationProgram 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 wereexposed in steady-state elevated turbine exit temperature (TET) engine testing, with couponsremoved 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 airwith 10% H2O. Post test assessment of the coupons was performed at ORNL by lightmicroscopy and electron probe microanalysis. The higher Al and Nb containing AFA alloysexhibited excellent resistance to oxidation/corrosion, and thus show good promise forrecuperator applications.