Accelerated formation of M2C carbides by proton irradiation inhibits molten salt corrosion in Ni-based alloy

Weichi Ji; Zhenbo Zhu; Hefei Huang; Cheng Li; Guanhong Lei; Yan Li

Journal of Materials Research and Technology (Nov 2024)

Accelerated formation of M2C carbides by proton irradiation inhibits molten salt corrosion in Ni-based alloy

Weichi Ji,
Zhenbo Zhu,
Hefei Huang,
Cheng Li,
Guanhong Lei,
Yan Li

Affiliations

Weichi Ji: School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, China; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
Zhenbo Zhu: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
Hefei Huang: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China; Corresponding author. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
Cheng Li: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
Guanhong Lei: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
Yan Li: School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, China; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China; Corresponding author. School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, China.

Journal volume & issue: Vol. 33
pp. 742 – 748

Abstract

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The effect of displacement damage on the corrosion behavior in a molten FLiBe salt environment was investigated. The element distribution and microstructure around the grain boundaries (GBs) after corrosion were characterized. The results show a decrease in corrosion thickness with increasing irradiation dose and the presence of intergranular corrosion. Nanoscales M2C carbides were observed to be distributed, with a denser and thicker distribution in samples with higher irradiation doses. Their distribution depth is related to the Cr depletion region, inhibiting Cr diffusion toward the GBs and surface. Furthermore, the nucleation mechanism of M2C carbides along the GBs and in irradiated regions was revealed, attributed to the combined effects of thermal influences, element preferential dissolution due to corrosion, and irradiation-induced segregation.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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