Abstract
The effect of Al on α’ precipitation in FeCrAl alloys was studied through thermal aging of several model binary FeCr and FeCrAl alloys with Cr content of 13 wt.%, 17 wt.%, and 25 wt.% with and without 5.5 wt.% Al. Aging was performed up to 1,000 h at varying temperatures from 400 to 500 °C. At 400 °C no age hardening was observed due to slow kinetics at this temperature. For both the 17Cr and 25Cr alloys, the addition of Al shows a lowering of the miscibility gap, consistent with other reports in literature. Interestingly, however, for the 25Cr alloys the addition of Al in the FeCrAl ternary alloy accelerated α’ precipitation below the miscibility gap. Such enhanced precipitation has also been predicted by our atomistic kinetic Monte Carlo (AKMC) simulations. While previous literature has often focused on Al suppressing α’, here we show that while Al can lower the miscibility gap in the Fe-Cr ferritic system thermodynamically, it may also enhance the kinetics of precipitation.
Original language | English |
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Article number | 155542 |
Journal | Journal of Nuclear Materials |
Volume | 605 |
DOIs | |
State | Published - Feb 2025 |
Funding
Scott Oppenheimer is gratefully acknowledged for his assistance in alloy casting. Keith Lauria and Tanaya Mandal are gratefully acknowledged for their assistance in thermal aging experiments. Shirish Chodankar at the National Synchrotron Light Source-II is gratefully acknowledged for the small angle x-ray scattering data collection at the beamline. The development of the AKMC model was fully sponsored by the U.S. Department of Energy, Office of Nuclear Energy, Nuclear Energy Advanced Modeling and Simulation (NEAMS) Program at Idaho National Laboratory operated by Battelle Energy Alliance (BEA) under DOE-NE Idaho Operations Office Contract DE-AC07-05ID14517 . This material is based on work supported by the Department of Energy under Award Number DE-NE0009047. This research used the Life Science X-ray Scattering (LIX) beamline at the National Synchrotron Light Source-II, a DOE, Office of Science User Facility operated for the DOE, Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704 . The LiX beamline is part of the Life Science Biomedical Technology Research resource, primarily supported by the National Institute of Health, National Institute of General Medical Sciences under Grant P41 GM111244 , and by the DOE Office of Biological and Environmental Research under Grant KP1605010 , with additional support from NIH Grant S10 OD012331 . The funding by GE Hitachi Nuclear and Global Nuclear Fuels Americas is gratefully acknowledged. This report was prepared as an account of work sponsored by an agency of the U.S. government. Neither the U.S. government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. government or any agency thereof. The views and opinions of the authors expressed herein do not necessarily state or reflect those of the U.S. government or any agency thereof. Scott Oppenheimer is gratefully acknowledged for his assistance in alloy casting. Keith Lauria and Tanaya Mandal are gratefully acknowledged for their assistance in thermal aging experiments. Shirish Chodankar at the National Synchrotron Light Source-II is gratefully acknowledged for the small angle x-ray scattering data collection at the beamline. The development of the AKMC model was fully sponsored by the U.S. Department of Energy, Office of Nuclear Energy, Nuclear Energy Advanced Modeling and Simulation (NEAMS) Program at Idaho National Laboratory operated by Battelle Energy Alliance (BEA) under DOE-NE Idaho Operations Office Contract DE-AC07\u201305ID14517. This material is based on work supported by the Department of Energy under Award Number DE-NE0009047. This research used the Life Science X-ray Scattering (LIX) beamline at the National Synchrotron Light Source-II, a DOE, Office of Science User Facility operated for the DOE, Office of Science by Brookhaven National Laboratory under Contract No DE-SC0012704. The LiX beamline is part of the Life Science Biomedical Technology Research resource, primarily supported by the National Institute of Health, National Institute of General Medical Sciences under Grant P41 GM111244, and by the DOE Office of Biological and Environmental Research under Grant KP1605010, with additional support from NIH Grant S10 OD012331. The funding by GE Hitachi Nuclear and Global Nuclear Fuels Americas is gratefully acknowledged. This report was prepared as an account of work sponsored by an agency of the U.S. government. Neither the U.S. government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. government or any agency thereof. The views and opinions of the authors expressed herein do not necessarily state or reflect those of the U.S. government or any agency thereof.
Keywords
- Age hardening
- CALPHAD
- FeCrAl
- Kinetic Monte Carlo (KMC)
- α’ precipitation