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

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-17 DOI:10.1016/j.jmrt.2024.09.142

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Abstract

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.

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研究了位移损伤对熔融 FLiBe 盐环境中腐蚀行为的影响。对腐蚀后晶界（GBs）周围的元素分布和微观结构进行了表征。结果表明，随着辐照剂量的增加，腐蚀厚度减小，并且存在晶间腐蚀。在辐照剂量较高的样品中，观察到纳米级 M2C 碳化物的分布，且分布更密集、更厚。它们的分布深度与铬耗尽区有关，抑制了铬向 GB 和表面的扩散。此外，还揭示了沿 GB 和辐照区域 M2C 碳化物的成核机制，这归因于热影响、腐蚀导致的元素优先溶解和辐照诱导偏析的综合效应。

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来源期刊

Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys

CiteScore

8.80

自引率

9.40%

发文量

1877

审稿时长

35 days

期刊介绍： The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.