Abstract
A new alloy design concept for creep- and corrosion-resistant, fully ferritic alloys was proposed for high-temperature structural applications in current/future fossil-fired power plants. The alloys, based on the Fe-30Cr-3Al (in weight percent) system with minor alloying additions of Nb, W, Si, Zr and/or Y, were designed for corrosion resistance though high Cr content, steam oxidation resistance through alumina-scale formation, and high-temperature creep performance through fine particle dispersion of Fe2(Nb,W)-type Laves phase in the BCC-Fe matrix. Theses alloys are targeted for use in harsh environments such as combustion and/or steam containing atmospheres at 700°C or greater. The alloys, consisting of Fe-30Cr-3Al-1Nb-6W with minor alloying additions, exhibited a successful combination of oxidation, corrosion, and creep resistances comparable or superior to those of commercially available heat resistant austenitic stainless steels. An optimized thermo-mechanical treatment combined with selected minor alloying additions resulted in a refined grain structure with high thermal stability even at 1200°C, which improved room-temperature ductility without sacrificing the creep performance. The mechanism of grain refinement in the alloy system is discussed.
| Original language | English |
|---|---|
| Title of host publication | Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials |
| Editors | John Shingledecker, Masao Takeyama |
| Publisher | ASM International |
| Pages | 628-639 |
| Number of pages | 12 |
| ISBN (Electronic) | 9781627082716 |
| DOIs | |
| State | Published - 2019 |
| Event | Joint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials - Nagasaki, Japan Duration: Oct 21 2019 → Oct 24 2019 |
Publication series
| Name | Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials |
|---|
Conference
| Conference | Joint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials |
|---|---|
| Country/Territory | Japan |
| City | Nagasaki |
| Period | 10/21/19 → 10/24/19 |
Funding
The authors thank Drs. Dean Pierce at Oak Ridge National Laboratory, Dr. Kazuhiro Kimura at National Institute for Materials Science, and Dr. Bernd Kuhn at Forschungszentrum Jülich GmbH for the comments on this manuscript and alloy designs in the present study. Research sponsored by the U.S Department of Energy, Office of Fossil Energy, Crosscutting Research Program. A part of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
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