MX precipitate behavior in an irradiated advanced Fe-9Cr steel: Helium effects on phase stability

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-06-11 DOI:10.1016/j.actamat.2025.121202

T.M. Kelsy Green, Tim Graening, Weicheng Zhong, Ying Yang, Kevin G. Field

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Abstract

As part of an ongoing series aimed at optimizing Fe-9Cr reduced activation ferritic/martensitic (RAFM) alloys for fusion energy systems, this study explores MX precipitate behavior under dual-ion irradiations, specifically examining correlations between helium transmutation and irradiation-induced damage. Utilizing single and dual-beam ion irradiation, the research explores the combined effects of helium (10-25 appm He/dpa), temperature (400-600°C), and damage levels (15-100 dpa) on the microstructural evolution of CNA9 steel, a variant of Castable Nanostructured Alloys (CNAs). The study demonstrates that helium co-implantation hinders radiation-enhanced coarsening of MX-TiC precipitates at 500 and 600°C, maintaining MX-TiC precipitate stability at moderate damage levels (15 dpa) but failing to prevent complete precipitate dissolution at higher damage levels (≥50 dpa) when irradiated at 500°C. A generalized precipitate stability model suggests that helium-induced suppression of diffusion alters the balance between recoil resolution and back diffusion for MX-TiC precipitates, enhancing the current understanding of precipitate behavior under damage and transmutation simulated dual-ion irradiation conditions.

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辐照高级Fe-9Cr钢中MX析出行为：氦对相稳定性的影响

作为正在进行的旨在优化用于聚变能系统的Fe-9Cr低活化铁素体/马氏体（RAFM）合金的系列研究的一部分，本研究探索了双离子辐照下MX沉淀的行为，特别是检查了氦嬗变与辐照诱导损伤之间的相关性。利用单束和双束离子辐照，研究了氦（10-25 appm He/dpa）、温度（400-600°C）和损伤水平（15-100 dpa）对可浇注纳米结构合金（CNAs） CNA9钢微观组织演变的综合影响。研究表明，氦共注入阻碍了500和600℃辐射增强的MX-TiC相粗化，在中等损伤水平（15 dpa）下保持了MX-TiC相的稳定性，但在500℃辐照下，在较高损伤水平（≥50 dpa）下未能阻止析出相的完全溶解。一个广义的析出物稳定性模型表明，氦诱导的扩散抑制改变了MX-TiC析出物的反冲分辨和反向扩散之间的平衡，增强了目前对损伤和嬗变模拟双离子辐照条件下析出物行为的理解。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.