Increasing the Upper Temperature Oxidation Limit of Alumina Forming Austenitic Stainless Steels in Air with Water Vapor
| Autor: | Yukinori Yamamoto, Michael P. Brady, Larry R Walker, Michael J. Lance, Kinga A. Unocic, Michael L. Santella |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Metallurgy Alloy technology industry and agriculture Metals and Alloys engineering.material equipment and supplies Microstructure Corrosion Carbide Inorganic Chemistry chemistry.chemical_compound chemistry Boride Materials Chemistry engineering Austenitic stainless steel Internal oxidation Water vapor |
| Zdroj: | Oxidation of Metals. 75:337-357 |
| ISSN: | 1573-4889 0030-770X |
| Popis: | A family of alumina-forming austenitic (AFA) stainless steels is under development for use in aggressive oxidizing conditions from ~600–900 °C. These alloys exhibit promising mechanical properties but oxidation resistance in air with water vapor environments is currently limited to ~800 °C due to a transition from external protective alumina scale formation to internal oxidation of aluminum with increasing temperature. The oxidation behavior of a series of AFA alloys was systematically studied as a function of Cr, Si, Al, C, and B additions in an effort to provide a basis to increase the upper-temperature oxidation limit. Oxidation exposures were conducted in air with 10% water vapor environments from 800–1000 °C, with post oxidation characterization of the 900 °C exposed samples by electron probe microanalysis (EPMA), scanning and transmission electron microscopy, and photo-stimulated luminescence spectroscopy (PSLS). Increased levels of Al, C, and B additions were found to increase the upper-temperature oxidation limit in air with water vapor to between 950 and 1000 °C. These findings are discussed in terms of alloy microstructure and possible gettering of hydrogen from water vapor at second phase carbide and boride precipitates. |
| Databáze: | OpenAIRE |
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