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Title: Development of low-Cr ODS FeCrAl alloys for accident-tolerant fuel cladding

Abstract

Low-Cr oxide dispersion strengthened (ODS) FeCrAl alloys were developed as accident tolerant fuel cladding because of their excellent oxidation resistance at very high temperature, high strength and improved radiation tolerance. Fe-12Cr-5Al wt.% gas atomized powder was ball milled with Y 2O 3+FeO, Y 2O 3+ZrO 2 or Y 2O 3+TiO 2, and the resulting powders were extruded at 950°C. The resulting fine grain structure, particularly for the Ti and Zr containing alloys, led to very high strength but limited ductility. Comparison with variants of commercial PM2000 (Fe-20Cr-5Al) highlighted the significant impact of the powder consolidation step on the alloy grain size and, therefore, on the alloy mechanical properties at T < 500 °C. These low-Cr compositions exhibited good oxidation resistance at 1400 °C in air and steam for 4 h but could not form a protective alumina scale at 1450 °C, similar to observations for fine grained PM2000 alloys. As a result, the effect of alloy grain size, Zr and Ti additions, and impurities on the alloy mechanical and oxidation behaviors are discussed.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1461065
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 501; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Dryepondt, Sebastien N., Unocic, Kinga A., Hoelzer, David T., Massey, Caleb P., and Pint, Bruce A. Development of low-Cr ODS FeCrAl alloys for accident-tolerant fuel cladding. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2017.12.035.
Dryepondt, Sebastien N., Unocic, Kinga A., Hoelzer, David T., Massey, Caleb P., & Pint, Bruce A. Development of low-Cr ODS FeCrAl alloys for accident-tolerant fuel cladding. United States. doi:10.1016/j.jnucmat.2017.12.035.
Dryepondt, Sebastien N., Unocic, Kinga A., Hoelzer, David T., Massey, Caleb P., and Pint, Bruce A. Wed . "Development of low-Cr ODS FeCrAl alloys for accident-tolerant fuel cladding". United States. doi:10.1016/j.jnucmat.2017.12.035. https://www.osti.gov/servlets/purl/1461065.
@article{osti_1461065,
title = {Development of low-Cr ODS FeCrAl alloys for accident-tolerant fuel cladding},
author = {Dryepondt, Sebastien N. and Unocic, Kinga A. and Hoelzer, David T. and Massey, Caleb P. and Pint, Bruce A.},
abstractNote = {Low-Cr oxide dispersion strengthened (ODS) FeCrAl alloys were developed as accident tolerant fuel cladding because of their excellent oxidation resistance at very high temperature, high strength and improved radiation tolerance. Fe-12Cr-5Al wt.% gas atomized powder was ball milled with Y2O3+FeO, Y2O3+ZrO2 or Y2O3+TiO2, and the resulting powders were extruded at 950°C. The resulting fine grain structure, particularly for the Ti and Zr containing alloys, led to very high strength but limited ductility. Comparison with variants of commercial PM2000 (Fe-20Cr-5Al) highlighted the significant impact of the powder consolidation step on the alloy grain size and, therefore, on the alloy mechanical properties at T < 500 °C. These low-Cr compositions exhibited good oxidation resistance at 1400 °C in air and steam for 4 h but could not form a protective alumina scale at 1450 °C, similar to observations for fine grained PM2000 alloys. As a result, the effect of alloy grain size, Zr and Ti additions, and impurities on the alloy mechanical and oxidation behaviors are discussed.},
doi = {10.1016/j.jnucmat.2017.12.035},
journal = {Journal of Nuclear Materials},
number = C,
volume = 501,
place = {United States},
year = {2018},
month = {1}
}

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