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Title: Development of 1100 °C Capable Alumina-Forming Austenitic Alloys

Recently dalumina-forming austenitic (AFA) alloys based on ~12–32 weight % (wt%) Ni have been developed and offer an attractive combination of oxidation resistance and creep resistance at relatively low alloy cost. But, 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. Furthermore, we observed protective alumina scale formation at levels of 35Ni, 25Cr, and 4Al with additions of Nb and C, indicating promise for 1100°C capable cast AFA alloys.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Oxidation of Metals
Additional Journal Information:
Journal Volume: 87; Journal Issue: 1-2; Journal ID: ISSN 0030-770X
Publisher:
Springer
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; alumina; water vapor; Fe-base alloy; Ni-base alloy
OSTI Identifier:
1344247

Brady, M. P., Muralidharan, G., Yamamoto, Y., and Pint, B. A.. Development of 1100 °C Capable Alumina-Forming Austenitic Alloys. United States: N. p., Web. doi:10.1007/s11085-016-9667-3.
Brady, M. P., Muralidharan, G., Yamamoto, Y., & Pint, B. A.. Development of 1100 °C Capable Alumina-Forming Austenitic Alloys. United States. doi:10.1007/s11085-016-9667-3.
Brady, M. P., Muralidharan, G., Yamamoto, Y., and Pint, B. A.. 2016. "Development of 1100 °C Capable Alumina-Forming Austenitic Alloys". United States. doi:10.1007/s11085-016-9667-3. https://www.osti.gov/servlets/purl/1344247.
@article{osti_1344247,
title = {Development of 1100 °C Capable Alumina-Forming Austenitic Alloys},
author = {Brady, M. P. and Muralidharan, G. and Yamamoto, Y. and Pint, B. A.},
abstractNote = {Recently dalumina-forming austenitic (AFA) alloys based on ~12–32 weight % (wt%) Ni have been developed and offer an attractive combination of oxidation resistance and creep resistance at relatively low alloy cost. But, 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. Furthermore, we observed protective alumina scale formation at levels of 35Ni, 25Cr, and 4Al with additions of Nb and C, indicating promise for 1100°C capable cast AFA alloys.},
doi = {10.1007/s11085-016-9667-3},
journal = {Oxidation of Metals},
number = 1-2,
volume = 87,
place = {United States},
year = {2016},
month = {11}
}