Influence of grain size on α' Cr precipitation in an isothermally aged Fe-21Cr-5Al alloy

Arivu, Maalavan; Hoffman, Andrew; Poplawsky, Jonathan; Spinelli, Ian; Dai, Cong; Rebak, Raul B.; Cole, James; Islamgaliev, Rinat K.; Valiev, Ruslan Z.; Wen, Haiming

doi:10.1016/j.mtla.2024.102047

Influence of grain size on α' Cr precipitation in an isothermally aged Fe-21Cr-5Al alloy

Journal Article · Fri Mar 01 00:00:00 EST 2024 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2024.102047· OSTI ID:2438708

^[1]; Hoffman, Andrew ^[2]; ^[3]; Spinelli, Ian ^[2]; Dai, Cong ^[4]; Rebak, Raul B. ^[2]; ^[5]; ^[6]; ^[7]; ^[1]

Missouri Univ. of Science and Technology, Rolla, MO (United States)
General Electric Co., Schenectady, NY (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Canadian Nuclear Laboratories, Chalk River, ON (Canada)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Ufa State Aviation Technical University (Russia)
Ufa State Aviation Technical University (Russia); St. Petersburg State University (Russia)

Cr-rich α' precipitation during aging typically leads to hardening and accordingly embrittlement of FeCrAl alloys, which needs to be suppressed. The influence of grain size on α' precipitation was studied by aging coarse-grained (CG), ultra-fine grained (UFG), and nanocrystalline (NC) ferritic Kanthal-D [KD; Fe-21Cr-5Al (wt.%) alloy] at 450, 500 and 550 °C for 500 h. After aging at 450 and 500 °C, less hardening was observed in the UFG KD than in CG KD. Atom probe tomography indicated a lower number density and larger sized intragranular α' in the UFG versus the CG alloy. The smaller grain size and higher defect (vacancy and dislocation) density in the UFG KD facilitated diffusion and accordingly enhanced precipitation kinetics, leading to coarsening of precipitates, as well as saturation of precipitation at lower temperatures, as compared to those in CG KD. No hardening occurred in UFG and CG KD after aging at 550 °C, indicating that the miscibility gap is between 500 and 550 °C. NC KD exhibited softening after aging owing to grain growth. α' precipitation occurred in NC KD aged at 450 °C but not at 500 °C, indicating that miscibility gap is between 450 and 500 °C. Thus, the significantly smaller grain size in NC KD decreased the miscibility gap, as compared to that in CG and UFG KD. Finally, this is attributed to the absorption of vacancies by migrating grain boundaries during aging, suppressing α' nucleation and enhancing Cr solubility.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); USDOE Office of Nuclear Energy (NE), Nuclear Energy Enabling Technologies (NEET)

Grant/Contract Number:: AC05-00OR22725; NE0008524

OSTI ID:: 2438708

Alternate ID(s):: OSTI ID: 2325481

Journal Information:: Materialia, Journal Name: Materialia Vol. 34; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Influence of grain size on α' Cr precipitation in an isothermally aged Fe-21Cr-5Al alloy

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