Abstract
Recently developed alumina-forming austenitic (AFA) alloys based on ~12–32 weight % (wt%) Ni offer an attractive combination of oxidation resistance and creep resistance at relatively low alloy cost. However, they exhibit a transition to internal oxidation and nitridation of Al above ~750–950 °C depending on composition and exposure environment. In order to identify AFA compositions capable of higher-temperature operation for applications such as ethylene cracking, the oxidation behavior of a series of developmental, as-cast nominal Fe–(25–45)Ni–(10–25)Cr–(4–5)Al–1Si–0.15Hf–0.07Y–0.01B wt% base alloys with and without Nb, Ti, and C additions was evaluated at 1100 °C in air with 10% water vapor. Protective alumina scale formation was observed at levels of 35Ni, 25Cr, and 4Al with additions of Nb and C, indicating promise for 1100°C capable cast AFA alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | Oxidation of Metals |
| Volume | 87 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Feb 1 2017 |
Funding
The authors thank C. Carmichael, M. Stephens, and T.M. Lowe for assistance with the experimental work. S. Dryepondt and M. Lance provided comments for the manuscript. This research was sponsored by Oak Ridge National Laboratory’s Laboratory Directed Research and Development (LDRD) Technology Innovation Program and U.S. Department of Energy ARPA-E program. 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 ). The authors thank C. Carmichael, M. Stephens, and T.M. Lowe for assistance with the experimental work. S. Dryepondt and M. Lance provided comments for the manuscript. This research was sponsored by Oak Ridge National Laboratory's Laboratory Directed Research and Development (LDRD) Technology Innovation Program and U.S. Department of Energy ARPA-E program. 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 ).
Keywords
- Alumina
- Fe-base alloy
- Ni-base alloy
- Water vapor