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Title: Compatibility of an FeCrAl alloy with flowing Pb-Li in a thermal convection loop

A mono-metallic thermal convection loop (TCL) fabricated from alloy APMT (Fe21Cr5Al3Mo) tubing and filled with 0.025 m long tensile specimens of the same alloy was operated continuously for 1000 h with commercially pure Pb-17 at.%Li (Pb-Li) at a peak temperature of 550 ± 1.5 °C and a temperature gradient of ~116 °C. The resulting Pb-Li flow rate was ~0.0067 m/s. A 1050 °C pre-oxidation treatment (to form an external alumina scale) given to most specimens exposed within the TCL decreased total mass loss by a factor of 3–30 compared to adjacent specimens that were not pre-oxidized. However, all specimens exposed above 500 °C lost mass suggesting that the alumina scale was not entirely stable in flowing Pb-Li at these temperatures. Post-exposure room temperature tensile tests indicated that the mechanical properties of APMT were substantially influenced by extended exposures in the range of 435–490 °C, which caused an increase in yield strength (~65%) and a corresponding decrease in ductility associated with α' embrittlement. Specimens annealed in argon at the same temperature exhibited identical changes without exposure to Pb-Li. In conclusion, scanning transmission electron microscopy revealed Cr-clusters within the microstructure in specimens exposed in the low temperature regions (<490 °C) of themore » TCL, indicating the formation of α' consistent with the mechanism of α' embrittlement.« less
Authors:
 [1] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 492; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Pb-Li loop; APMT; Oxide scale; Mass change; Pre-oxidation treatment; Strength
OSTI Identifier:
1407753
Alternate Identifier(s):
OSTI ID: 1416831

Pawel, Steven J., and Unocic, Kinga A.. Compatibility of an FeCrAl alloy with flowing Pb-Li in a thermal convection loop. United States: N. p., Web. doi:10.1016/j.jnucmat.2017.04.048.
Pawel, Steven J., & Unocic, Kinga A.. Compatibility of an FeCrAl alloy with flowing Pb-Li in a thermal convection loop. United States. doi:10.1016/j.jnucmat.2017.04.048.
Pawel, Steven J., and Unocic, Kinga A.. 2017. "Compatibility of an FeCrAl alloy with flowing Pb-Li in a thermal convection loop". United States. doi:10.1016/j.jnucmat.2017.04.048. https://www.osti.gov/servlets/purl/1407753.
@article{osti_1407753,
title = {Compatibility of an FeCrAl alloy with flowing Pb-Li in a thermal convection loop},
author = {Pawel, Steven J. and Unocic, Kinga A.},
abstractNote = {A mono-metallic thermal convection loop (TCL) fabricated from alloy APMT (Fe21Cr5Al3Mo) tubing and filled with 0.025 m long tensile specimens of the same alloy was operated continuously for 1000 h with commercially pure Pb-17 at.%Li (Pb-Li) at a peak temperature of 550 ± 1.5 °C and a temperature gradient of ~116 °C. The resulting Pb-Li flow rate was ~0.0067 m/s. A 1050 °C pre-oxidation treatment (to form an external alumina scale) given to most specimens exposed within the TCL decreased total mass loss by a factor of 3–30 compared to adjacent specimens that were not pre-oxidized. However, all specimens exposed above 500 °C lost mass suggesting that the alumina scale was not entirely stable in flowing Pb-Li at these temperatures. Post-exposure room temperature tensile tests indicated that the mechanical properties of APMT were substantially influenced by extended exposures in the range of 435–490 °C, which caused an increase in yield strength (~65%) and a corresponding decrease in ductility associated with α' embrittlement. Specimens annealed in argon at the same temperature exhibited identical changes without exposure to Pb-Li. In conclusion, scanning transmission electron microscopy revealed Cr-clusters within the microstructure in specimens exposed in the low temperature regions (<490 °C) of the TCL, indicating the formation of α' consistent with the mechanism of α' embrittlement.},
doi = {10.1016/j.jnucmat.2017.04.048},
journal = {Journal of Nuclear Materials},
number = C,
volume = 492,
place = {United States},
year = {2017},
month = {8}
}