Liquid metal compatibility of pre-oxidized FeCrAl in flowing Sn

B. A. Pint; Y. F. Su; M. Romedenne; J. Jun; M. Kondo; N. Oono; K. Sakamoto; Yuji Hatano

doi:10.1016/j.fusengdes.2024.114377

Liquid metal compatibility of pre-oxidized FeCrAl in flowing Sn

B. A. Pint, Y. F. Su, M. Romedenne, J. Jun, M. Kondo, N. Oono, K. Sakamoto, Yuji Hatano

Research output: Contribution to journal › Article › peer-review

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Abstract

A flowing Sn thermal convection loop (TCL) experiment was conducted in FeCrAlMo (Kanthal alloy APMT) tubing for 1000 h with a peak temperature of 400 °C. Oxide dispersion strengthened (ODS) Fe-(10–12)Cr-6Al and APMT specimens were exposed and all were pre-oxidized to form an external alumina scale. Unlike static exposures at 400° and 500 °C where pre-oxidation prevented dissolution, large mass losses were observed in the TCL hot leg after the specimens were cleaned in Li. The observed pitting suggests that localized failure of the pre-formed alumina surface oxide caused significant metal loss. Specimen mass gains were not observed on the cold leg implying that mass transfer did not occur and the small levels of Fe and Cr in the Sn after the experiment implies that Sn-rich phases may have formed. Post exposure room temperature tensile testing showed limited impact of the Sn exposure on the 12Cr ODS FeCrAl alloy, comparable to a 1000 h anneal in Ar at 400 °C. These results suggest that pre-oxidation is not sufficient to protect FeCrAl alloys in contact with flowing liquid Sn at 350°-400 °C.

Original language	English
Article number	114377
Journal	Fusion Engineering and Design
Volume	202
DOIs	https://doi.org/10.1016/j.fusengdes.2024.114377
State	Published - May 2024

Funding

Notice: 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 experimental work was conducted at ORNL by A. Willoughby, M. Stephens, T. Lowe and V. Cox. Paul Humrickhouse and Sebastien Dryepondt at ORNL provided useful comments on the manuscript. This research was part of Task 3 in the Japan-US FRONTIER collaboration and was jointly funded including support from the U.S. Department of Energy's Office of Fusion Energy Sciences. The STEM work was supported by the Office of Nuclear Energy, Fuel Cycle R&D Program and the Nuclear Science User Facilities.

Funders	Funder number
U.S. Department of Energy
Fusion Energy Sciences

Keywords

Compatibility
Liquid Sn
ODS FeCrAl
Plasma facing components

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.fusengdes.2024.114377

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title = "Liquid metal compatibility of pre-oxidized FeCrAl in flowing Sn",

abstract = "A flowing Sn thermal convection loop (TCL) experiment was conducted in FeCrAlMo (Kanthal alloy APMT) tubing for 1000 h with a peak temperature of 400 °C. Oxide dispersion strengthened (ODS) Fe-(10–12)Cr-6Al and APMT specimens were exposed and all were pre-oxidized to form an external alumina scale. Unlike static exposures at 400° and 500 °C where pre-oxidation prevented dissolution, large mass losses were observed in the TCL hot leg after the specimens were cleaned in Li. The observed pitting suggests that localized failure of the pre-formed alumina surface oxide caused significant metal loss. Specimen mass gains were not observed on the cold leg implying that mass transfer did not occur and the small levels of Fe and Cr in the Sn after the experiment implies that Sn-rich phases may have formed. Post exposure room temperature tensile testing showed limited impact of the Sn exposure on the 12Cr ODS FeCrAl alloy, comparable to a 1000 h anneal in Ar at 400 °C. These results suggest that pre-oxidation is not sufficient to protect FeCrAl alloys in contact with flowing liquid Sn at 350°-400 °C.",

keywords = "Compatibility, Liquid Sn, ODS FeCrAl, Plasma facing components",

author = "Pint, {B. A.} and Su, {Y. F.} and M. Romedenne and J. Jun and M. Kondo and N. Oono and K. Sakamoto and Yuji Hatano",

note = "Publisher Copyright: {\textcopyright} 2024",

year = "2024",

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doi = "10.1016/j.fusengdes.2024.114377",

language = "English",

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T1 - Liquid metal compatibility of pre-oxidized FeCrAl in flowing Sn

AU - Pint, B. A.

AU - Su, Y. F.

AU - Romedenne, M.

AU - Jun, J.

AU - Kondo, M.

AU - Oono, N.

AU - Sakamoto, K.

AU - Hatano, Yuji

PY - 2024/5

Y1 - 2024/5

N2 - A flowing Sn thermal convection loop (TCL) experiment was conducted in FeCrAlMo (Kanthal alloy APMT) tubing for 1000 h with a peak temperature of 400 °C. Oxide dispersion strengthened (ODS) Fe-(10–12)Cr-6Al and APMT specimens were exposed and all were pre-oxidized to form an external alumina scale. Unlike static exposures at 400° and 500 °C where pre-oxidation prevented dissolution, large mass losses were observed in the TCL hot leg after the specimens were cleaned in Li. The observed pitting suggests that localized failure of the pre-formed alumina surface oxide caused significant metal loss. Specimen mass gains were not observed on the cold leg implying that mass transfer did not occur and the small levels of Fe and Cr in the Sn after the experiment implies that Sn-rich phases may have formed. Post exposure room temperature tensile testing showed limited impact of the Sn exposure on the 12Cr ODS FeCrAl alloy, comparable to a 1000 h anneal in Ar at 400 °C. These results suggest that pre-oxidation is not sufficient to protect FeCrAl alloys in contact with flowing liquid Sn at 350°-400 °C.

AB - A flowing Sn thermal convection loop (TCL) experiment was conducted in FeCrAlMo (Kanthal alloy APMT) tubing for 1000 h with a peak temperature of 400 °C. Oxide dispersion strengthened (ODS) Fe-(10–12)Cr-6Al and APMT specimens were exposed and all were pre-oxidized to form an external alumina scale. Unlike static exposures at 400° and 500 °C where pre-oxidation prevented dissolution, large mass losses were observed in the TCL hot leg after the specimens were cleaned in Li. The observed pitting suggests that localized failure of the pre-formed alumina surface oxide caused significant metal loss. Specimen mass gains were not observed on the cold leg implying that mass transfer did not occur and the small levels of Fe and Cr in the Sn after the experiment implies that Sn-rich phases may have formed. Post exposure room temperature tensile testing showed limited impact of the Sn exposure on the 12Cr ODS FeCrAl alloy, comparable to a 1000 h anneal in Ar at 400 °C. These results suggest that pre-oxidation is not sufficient to protect FeCrAl alloys in contact with flowing liquid Sn at 350°-400 °C.

KW - Compatibility

KW - Liquid Sn

KW - ODS FeCrAl

KW - Plasma facing components

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Liquid metal compatibility of pre-oxidized FeCrAl in flowing Sn

Abstract

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Keywords

UN SDGs

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