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Evaluation of Corrosion Behavior of Various Fe- and Ni-Based Alloys in Molten Li2BeF4 (FLiBe)
Abstract
Reliable performance of structural alloys is essential for the successful implementation of Generation-IV fluoride salt–cooled high-temperature reactors (FHRs). Most FHR designs are considering molten salt (2LiF-BeF2), or FLiBe, as a primary coolant or fuel carrier. The main corrosion mechanism for alloys exposed to molten fluoride salts is the selective dealloying of active alloying elements. Alloy composition has a significant effect on their high-temperature mechanical properties, but also affects their corrosion behavior. Although Hastelloy-N and its variants show good corrosion resistance compared to higher Cr-containing Ni- or Fe-based alloys, the mechanical properties of these alloys degrade quickly at temperatures above ~600°C. Twelve Ni-based or Fe-based alloys were selected due to their high temperature stability or their low Cr alloy composition and tested for their corrosion behavior in FLiBe. The results show that the mode and the extent of alloy degradation by selective dissolution mechanism corelates well with the overall alloy composition, and not just the concentration of active elements. It was found that there was good correlation between weight loss of the tested alloys and the ratio of major active elements (Cr, Mn) to that of the more noble alloying elements (Ni, Mo).
- Authors:
-
[1];
[2];
[1]
- Georgia Institute of Technology, Atlanta, GA (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
- OSTI Identifier:
- 1997782
- Grant/Contract Number:
- AC05-00OR22725; NE0008749
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Technology
- Additional Journal Information:
- Journal Volume: 00; Journal Issue: 00; Journal ID: ISSN 0029-5450
- Publisher:
- Taylor & Francis
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 22 GENERAL STUDIES OF NUCLEAR REACTORS; 36 MATERIALS SCIENCE; molten salt; corrosion; alloy selection; FLiBe
Citation Formats
Sankar, Krishna Moorthi, Keiser, James R., Sulejmanovic, Dino, Lowe, Tracie M., and Singh, Preet M. Evaluation of Corrosion Behavior of Various Fe- and Ni-Based Alloys in Molten Li2BeF4 (FLiBe). United States: N. p., 2023.
Web. doi:10.1080/00295450.2023.2229176.
Sankar, Krishna Moorthi, Keiser, James R., Sulejmanovic, Dino, Lowe, Tracie M., & Singh, Preet M. Evaluation of Corrosion Behavior of Various Fe- and Ni-Based Alloys in Molten Li2BeF4 (FLiBe). United States. https://doi.org/10.1080/00295450.2023.2229176
Sankar, Krishna Moorthi, Keiser, James R., Sulejmanovic, Dino, Lowe, Tracie M., and Singh, Preet M. Mon .
"Evaluation of Corrosion Behavior of Various Fe- and Ni-Based Alloys in Molten Li2BeF4 (FLiBe)". United States. https://doi.org/10.1080/00295450.2023.2229176.
@article{osti_1997782,
title = {Evaluation of Corrosion Behavior of Various Fe- and Ni-Based Alloys in Molten Li2BeF4 (FLiBe)},
author = {Sankar, Krishna Moorthi and Keiser, James R. and Sulejmanovic, Dino and Lowe, Tracie M. and Singh, Preet M.},
abstractNote = {Reliable performance of structural alloys is essential for the successful implementation of Generation-IV fluoride salt–cooled high-temperature reactors (FHRs). Most FHR designs are considering molten salt (2LiF-BeF2), or FLiBe, as a primary coolant or fuel carrier. The main corrosion mechanism for alloys exposed to molten fluoride salts is the selective dealloying of active alloying elements. Alloy composition has a significant effect on their high-temperature mechanical properties, but also affects their corrosion behavior. Although Hastelloy-N and its variants show good corrosion resistance compared to higher Cr-containing Ni- or Fe-based alloys, the mechanical properties of these alloys degrade quickly at temperatures above ~600°C. Twelve Ni-based or Fe-based alloys were selected due to their high temperature stability or their low Cr alloy composition and tested for their corrosion behavior in FLiBe. The results show that the mode and the extent of alloy degradation by selective dissolution mechanism corelates well with the overall alloy composition, and not just the concentration of active elements. It was found that there was good correlation between weight loss of the tested alloys and the ratio of major active elements (Cr, Mn) to that of the more noble alloying elements (Ni, Mo).},
doi = {10.1080/00295450.2023.2229176},
journal = {Nuclear Technology},
number = 00,
volume = 00,
place = {United States},
year = {Mon Jul 24 00:00:00 EDT 2023},
month = {Mon Jul 24 00:00:00 EDT 2023}
}
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