Overview of Strategies for High-Temperature Creep and Oxidation Resistance of Alumina-Forming Austenitic Stainless Steels |
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Authors: | Y Yamamoto MP Brady ML Santella H Bei PJ Maziasz BA Pint |
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Affiliation: | (1) Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6083, USA |
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Abstract: | A family of creep-resistant, alumina-forming austenitic (AFA) stainless steel alloys is under development for structural use
in fossil energy conversion and combustion system applications. The AFA alloys developed to date exhibit comparable creep-rupture
lives to state-of-the-art advanced austenitic alloys, and superior oxidation resistance in the ~923 K to 1173 K (650 °C to
900 °C) temperature range due to the formation of a protective Al2O3 scale rather than the Cr2O3 scales that form on conventional stainless steel alloys. This article overviews the alloy design approaches used to obtain
high-temperature creep strength in AFA alloys via considerations of phase equilibrium from thermodynamic calculations as well as microstructure characterization. Strengthening
precipitates under evaluation include MC-type carbides or intermetallic phases such as NiAl-B2, Fe2(Mo,Nb)-Laves, Ni3Al-L12, etc. in the austenitic single-phase matrix. Creep, tensile, and oxidation properties of the AFA alloys are discussed relative
to compositional and microstructural factors. |
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