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<p>Centrifugally-cast FeCrAl alloy is a prime candidate for manufacturing seamless thin-walled accident-tolerant fuel (ATF) cladding. However, tailoring its initial as-cast microstructure via hot working is critical for ensuring component integrity. In this study, the hot deformation behavior and microstructural evolution of a centrifugally-cast FeCrAl alloy were systematically investigated at temperatures of 850–1150°C and strain rates of 0.001–0.1 s<sup>−1</sup>. The constitutive analysis determined an average deformation activation energy of <i>Q</i> = 267 kJ mol<sup>−1</sup>, indicating a diffusion-controlled deformation mechanism. With decreasing Zener–Hollomon parameters, the microstructure transitioned from dynamic recovery (DRV) to complete dynamic recrystallization (DRX), evolving from elongated deformation bands into a uniform, fine-grained equiaxed structure. Crucially, high-temperature and low-strain-rate conditions significantly increased the fraction of HAGBs and promoted randomized crystallographic orientations, effectively eliminating the casting texture. EBSD analysis revealed a synergistic DRX mechanism: discontinuous dynamic recrystallization (DDRX) nucleated at grain boundaries, while continuous dynamic recrystallization (CDRX) transformed intragranular substructures. These findings identify favorable hot-working conditions for fabricating FeCrAl cladding tubes with a more uniform microstructure, and provide useful guidance for further optimization toward nuclear cladding applications.</p>

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Synergistic Dynamic Recrystallization Mechanisms in a Centrifugally-Cast FeCrAl Alloy: Towards Optimizing Thin-Walled Nuclear Cladding Tubes

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Di Zhang,
  • Chi Zhang,
  • Guo-Huai Liu,
  • Zhao-Dong Wang

摘要

Centrifugally-cast FeCrAl alloy is a prime candidate for manufacturing seamless thin-walled accident-tolerant fuel (ATF) cladding. However, tailoring its initial as-cast microstructure via hot working is critical for ensuring component integrity. In this study, the hot deformation behavior and microstructural evolution of a centrifugally-cast FeCrAl alloy were systematically investigated at temperatures of 850–1150°C and strain rates of 0.001–0.1 s−1. The constitutive analysis determined an average deformation activation energy of Q = 267 kJ mol−1, indicating a diffusion-controlled deformation mechanism. With decreasing Zener–Hollomon parameters, the microstructure transitioned from dynamic recovery (DRV) to complete dynamic recrystallization (DRX), evolving from elongated deformation bands into a uniform, fine-grained equiaxed structure. Crucially, high-temperature and low-strain-rate conditions significantly increased the fraction of HAGBs and promoted randomized crystallographic orientations, effectively eliminating the casting texture. EBSD analysis revealed a synergistic DRX mechanism: discontinuous dynamic recrystallization (DDRX) nucleated at grain boundaries, while continuous dynamic recrystallization (CDRX) transformed intragranular substructures. These findings identify favorable hot-working conditions for fabricating FeCrAl cladding tubes with a more uniform microstructure, and provide useful guidance for further optimization toward nuclear cladding applications.