Cr和Mo在FeCrAl合金低温蒸汽氧化中的协同作用

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-06-10 DOI:10.1016/j.corsci.2025.113107

Soumita Mondal , Arya Chatterjee , Ronit Roy , Md Ali Muntaha , Janelle P. Wharry , Haozheng J. Qu , Rajnikant Umretiya

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引用次数: 0

摘要

本研究的目的是了解Cr和Mo对两种商用FeCrAl合金的低温蒸汽氧化行为的协同作用。FeCrAl合金因其在事故情况下耐高温蒸汽氧化而成为耐事故核燃料包壳的主要候选材料。但是，作为沸水堆堆芯顶部正常运行的代表，在这些包层可以安全地部署在反应堆中之前，还必须了解feral合金的低温蒸汽氧化。本研究在高达1000 hr的400℃蒸汽中评估FA-SMT （Fe-21Cr-5Al-3Mo）和PM-C26M （Fe-12Cr-6Al-2Mo）。FA-SMT中较高的体积Cr含量加速了所有反应动力学，导致外部Cr2O3层快速生长，然后形成钝化的内部Al2O3层，阻碍进一步氧化。同时，Mo沿晶界取代Cr，阻止了Cr和Fe向外扩散，进一步阻碍了氧化。相比之下，PM-C26M更容易被蒸汽氧化，因为Mo仍然存在于固溶体中，允许不受控制的Fe氧化。Mo在高Cr含量下的有利效应可以被认为是“第四元素效应”，可以指导未来设计高强度、抗氧化的FeCrAl合金。

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Synergistic roles of Cr and Mo in low temperature steam oxidation of FeCrAl alloys

The objective of this study is to understand the synergistic role of Cr and Mo on low temperature steam oxidation behaviour of two commercial FeCrAl alloys. FeCrAl alloys are leading candidates for accident-tolerant nuclear fuel claddings owing to their resistance to high temperature steam oxidation in accident scenarios. But low temperature steam oxidation of FeCrAl alloys, representative of top-of-core normal operation of boiling water reactors, must also be understood before these claddings can be safely deployed in reactors. This study evaluates FA-SMT (Fe-21Cr-5Al-3Mo) and PM-C26M (Fe-12Cr-6Al-2Mo) in 400 ºC steam for up to 1000 hr. The higher bulk Cr content in FA-SMT accelerates all reaction kinetics, leading to rapid growth of an outer Cr₂O₃ layer, which then enables formation of a passivating inner Al₂O₃ layer that hinders further oxidation. Meanwhile, Mo replaces Cr along grain boundaries, preventing additional Cr and Fe outward diffusion, and further hindering oxidation. By contrast, PM-C26M is more susceptible to steam oxidation as Mo remains in solid solution, allowing uncontrolled Fe oxidation. The beneficial effects of Mo in the presence of high Cr content may be considered a “fourth element effect” that can guide future design of high-strength, oxidation-resistant FeCrAl alloys.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.