Comparison of the Thermal Stability in Equal‐Channel‐Angular‐Pressed and High‐Pressure‐Torsion‐Processed Fe–21Cr–5Al Alloy

Arivu, Maalavan; Hoffman, Andrew; Duan, Jiaqi; Poplawsky, Jonathan; Zhang, Xinchang; Liou, Frank; Islamgaliev, Rinat; Valiev, Ruslan; Wen, Haiming

doi:10.1002/adem.202300756

Comparison of the Thermal Stability in Equal‐Channel‐Angular‐Pressed and High‐Pressure‐Torsion‐Processed Fe–21Cr–5Al Alloy

Journal Article · Sun Sep 24 00:00:00 EDT 2023 · Advanced Engineering Materials

DOI:https://doi.org/10.1002/adem.202300756· OSTI ID:2004620

^[1]; Hoffman, Andrew ^[2]; Duan, Jiaqi ^[1]; Poplawsky, Jonathan ^[3]; Zhang, Xinchang ^[4]; Liou, Frank ^[4]; Islamgaliev, Rinat ^[5]; Valiev, Ruslan ^[5]; Wen, Haiming ^[6]

Department of Materials Science and Engineering Missouri University of Science and Technology Rolla MO 65409 USA
Department of Nuclear Engineering and Radiation Science Missouri University of Science and Technology Rolla MO 65409 USA
Center for Nanophase Materials Science Oak Ridge National Laboratory Oak Ridge TN 37830 USA
Department of Mechanical and Aerospace Engineering Missouri University of Science and Technology Rolla MO 65409 USA
Institute of Physics of Advanced Materials Ufa State Aviation Technical University Ufa 450008 Russia
Department of Materials Science and Engineering Missouri University of Science and Technology Rolla MO 65409 USA, Department of Nuclear Engineering and Radiation Science Missouri University of Science and Technology Rolla MO 65409 USA

Nanostructured steels are expected to have enhanced irradiation tolerance and improved strength. However, they suffer from poor microstructural stability at elevated temperatures. In this study, Fe–21Cr–5Al–0.026C (wt%) Kanthal D (KD) alloy belonging to a class of (FeCrAl) alloys considered for accident‐tolerant fuel cladding in light‐water reactors is nanostructured using two severe plastic deformation techniques of equal‐channel angular pressing (ECAP) and high‐pressure torsion (HPT), and their thermal stability between 500–700 °C is studied and compared. ECAP KD is found to be thermally stable up to 500 °C, whereas HPT KD is unstable at 500 °C. Microstructural characterization reveals that ECAP KD undergoes recovery at 550 °C and recrystallization above 600 °C, while HPT KD shows continuous grain growth after annealing above 500 °C. Enhanced thermal stability of ECAP KD is from significant fraction (>50%) of low‐angle grain boundaries (GBs) (misorientation angle 2–15°) stabilizing the microstructure due to their low mobility. Small grain sizes, a high fraction (>80%) of high‐angle GBs (misorientation angle >15°) and accordingly a large amount of stored GB energy, serve as the driving force for HPT KD to undergo grain growth instead of recrystallization driven by excess stored strain energy.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NE0008524

OSTI ID:: 2004620

Journal Information:: Advanced Engineering Materials, Journal Name: Advanced Engineering Materials Journal Issue: 21 Vol. 25; ISSN 1438-1656

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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