[article]
| Titre : |
Evaluation of alumina-forming austenitic foil for advanced recuperators |
| Type de document : |
texte imprimé |
| Auteurs : |
Bruce A. Pint, Auteur ; Michael P. Brady, Auteur ; Yukinori Yamamoto, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
06 p. |
| Note générale : |
Génie mécanique |
| Langues : |
Anglais (eng) |
| Mots-clés : |
Alumina Austenitic stainless steel Cogeneration Corrosion resistance Creep Films Forming processes Gas turbines Oxidation |
| Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
| Résumé : |
A corrosion- and creep-resistant austenitic stainless steel has been developed for advanced recuperator applications. By optimizing the Al and Cr contents, the alloy is fully austenitic for creep strength while allowing the formation of a chemically stable external alumina scale at temperatures up to 900°C. An alumina scale eliminates long-term problems with the formation of volatile Cr oxy-hydroxides in the presence of water vapor in exhaust gas. As a first step in producing foil for primary surface recuperators, three commercially cast heats have been rolled to ~100 µm thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at 675°C and 750°C, showing excellent creep strength compared with other candidate foil materials. Laboratory exposures in humid air at 650–800°C have shown acceptable oxidation resistance. A similar oxidation behavior was observed for sheet specimens of these alloys exposed in a modified 65 kW microturbine for 2871 h. One composition that showed superior creep and oxidation resistance has been selected for the preparation of a commercial batch of foil. |
| DEWEY : |
620.1 |
| ISSN : |
0742-4795 |
| En ligne : |
http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013300 [...] |
in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 10 (Octobre 2011) . - 06 p.
[article] Evaluation of alumina-forming austenitic foil for advanced recuperators [texte imprimé] / Bruce A. Pint, Auteur ; Michael P. Brady, Auteur ; Yukinori Yamamoto, Auteur . - 2011 . - 06 p. Génie mécanique Langues : Anglais ( eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 10 (Octobre 2011) . - 06 p.
| Mots-clés : |
Alumina Austenitic stainless steel Cogeneration Corrosion resistance Creep Films Forming processes Gas turbines Oxidation |
| Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
| Résumé : |
A corrosion- and creep-resistant austenitic stainless steel has been developed for advanced recuperator applications. By optimizing the Al and Cr contents, the alloy is fully austenitic for creep strength while allowing the formation of a chemically stable external alumina scale at temperatures up to 900°C. An alumina scale eliminates long-term problems with the formation of volatile Cr oxy-hydroxides in the presence of water vapor in exhaust gas. As a first step in producing foil for primary surface recuperators, three commercially cast heats have been rolled to ~100 µm thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at 675°C and 750°C, showing excellent creep strength compared with other candidate foil materials. Laboratory exposures in humid air at 650–800°C have shown acceptable oxidation resistance. A similar oxidation behavior was observed for sheet specimens of these alloys exposed in a modified 65 kW microturbine for 2871 h. One composition that showed superior creep and oxidation resistance has been selected for the preparation of a commercial batch of foil. |
| DEWEY : |
620.1 |
| ISSN : |
0742-4795 |
| En ligne : |
http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013300 [...] |
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