Evolution of B2 and laves phases in a ferritic steel under Fe2+ ion irradiation at 475 °C
Abstract
Microstructural evolution in a novel ferritic steel (Fe–12Cr–3W–3Ni–3Al–1Nb, in wt.%) computationally designed to contain B2 and Laves phases after 4 MeV Fe2+ ion irradiation up to 220 dpa at 475 °C was characterized using transmission electron microscopy in conjunction with x-ray energy dispersive spectroscopy. The ferritic matrix phase exhibited dislocation loops and tangled dislocations, but our focus was on stability of two types of intermetallic precipitates. The B2–NiAl precipitates ~13 nm in size remained crystalline and appeared to have slightly lower Al concentration after irradiation. The Laves phase, (Fe,Cr)2(Nb,W), were present in two size ranges: coarse micron-scale precipitates which were amorphized with a slight composition change at irradiation doses above~30 dpa, while the finer precipitate particles~100 nm in size were partially disintegrated with a noticeable composition change at doses above~70 dpa. Meanwhile, many Nb/Cr-enriched particles ~8 nm in size formed within a few hundreds of nanometers from the disintegrated particles. The understanding of the phase stability would help design advanced steels and engineer microstructures that are stable against high irradiation doses, while retaining good high temperature strength.
- Authors:
-
[2];
[2];
- Univ. of Wisconsin, Madison, WI (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1546497
- Alternate Identifier(s):
- OSTI ID: 1562591
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Nuclear Materials
- Additional Journal Information:
- Journal Volume: 525; Journal Issue: C; Journal ID: ISSN 0022-3115
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
He, Li, Tan, Lizhen, Yang, Ying, and Sridharan, Kumar. Evolution of B2 and laves phases in a ferritic steel under Fe2+ ion irradiation at 475 °C. United States: N. p., 2019.
Web. doi:10.1016/j.jnucmat.2019.07.024.
He, Li, Tan, Lizhen, Yang, Ying, & Sridharan, Kumar. Evolution of B2 and laves phases in a ferritic steel under Fe2+ ion irradiation at 475 °C. United States. https://doi.org/10.1016/j.jnucmat.2019.07.024
He, Li, Tan, Lizhen, Yang, Ying, and Sridharan, Kumar. Mon .
"Evolution of B2 and laves phases in a ferritic steel under Fe2+ ion irradiation at 475 °C". United States. https://doi.org/10.1016/j.jnucmat.2019.07.024. https://www.osti.gov/servlets/purl/1546497.
@article{osti_1546497,
title = {Evolution of B2 and laves phases in a ferritic steel under Fe2+ ion irradiation at 475 °C},
author = {He, Li and Tan, Lizhen and Yang, Ying and Sridharan, Kumar},
abstractNote = {Microstructural evolution in a novel ferritic steel (Fe–12Cr–3W–3Ni–3Al–1Nb, in wt.%) computationally designed to contain B2 and Laves phases after 4 MeV Fe2+ ion irradiation up to 220 dpa at 475 °C was characterized using transmission electron microscopy in conjunction with x-ray energy dispersive spectroscopy. The ferritic matrix phase exhibited dislocation loops and tangled dislocations, but our focus was on stability of two types of intermetallic precipitates. The B2–NiAl precipitates ~13 nm in size remained crystalline and appeared to have slightly lower Al concentration after irradiation. The Laves phase, (Fe,Cr)2(Nb,W), were present in two size ranges: coarse micron-scale precipitates which were amorphized with a slight composition change at irradiation doses above~30 dpa, while the finer precipitate particles~100 nm in size were partially disintegrated with a noticeable composition change at doses above~70 dpa. Meanwhile, many Nb/Cr-enriched particles ~8 nm in size formed within a few hundreds of nanometers from the disintegrated particles. The understanding of the phase stability would help design advanced steels and engineer microstructures that are stable against high irradiation doses, while retaining good high temperature strength.},
doi = {10.1016/j.jnucmat.2019.07.024},
journal = {Journal of Nuclear Materials},
number = C,
volume = 525,
place = {United States},
year = {Mon Jul 22 00:00:00 EDT 2019},
month = {Mon Jul 22 00:00:00 EDT 2019}
}
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Figures / Tables:
Fig. 1: 4.0 MeV Fe2+ induced damage (red curve) and implantation profiles (black curve) in the steel BL-Nb. Ed is atom displacement energy.
Figures / Tables found in this record: