Multi-scale investigation into the irradiation hardening mechanism of reduced activation ferrite/martensitic (RAFM) steels under heavy ion irradiation

IF 2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-09-02 DOI:10.1016/j.fusengdes.2025.115414

Yong Feng , Hang Xu , Tingping Hou , Xiangheng Xiao , Kaiming Wu

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Abstract

The irradiation resistance of RAFM steels has received considerable attention in the development of candidate structural materials for application in advanced reactors. The present study enhances the mechanical properties and irradiation resistance of RAFM steels by precisely modulating the concent of Si and W. The results show that increasing Si while decreasing W content can make the grain refinement, dislocation line increase, and carbide precipitation of RAFM steel is more fine and diffuse, showing more excellent mechanical properties and lower irradiation hardening rate, and provides a new reference for the design and optimization of RAFM steels. Additionally, the contribution of dislocation loops to irradiation hardening was evaluated using the Dispersive Barrier Hardening (DBH) model, and irradiation-induced matrix atomic misalignment phenomenon and its triggered lattice distortion and dislocation proliferation mechanism were deeply analyzed at the atomic level in conjunction with geometric phase analysis (GPA), and furthermore irradiation-induced segregation of the matrix composition and formation of nano clusters of Si were also revealed by atom probe tomography (APT). These findings have established the nature of irradiation hardening in RAFM steels and may provide a better understanding of irradiation damage mechanisms.

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重离子辐照下还原活化铁素体/马氏体（RAFM）钢辐照硬化机理的多尺度研究

在先进反应堆候选结构材料的开发中，RAFM钢的耐辐照性能受到了相当大的关注。本研究通过精确调节Si和W的含量来提高RAFM钢的力学性能和抗辐照性能。结果表明，增加Si含量而降低W含量可以使RAFM钢的晶粒细化，位错线增加，碳化物析出更加细小和扩散，表现出更优异的力学性能和更低的辐照硬化率，为RAFM钢的设计和优化提供了新的参考。此外，利用弥散势垒硬化（DBH）模型评估了位错环对辐照硬化的贡献，并结合几何相分析（GPA）在原子水平上深入分析了辐照诱导的基体原子错位现象及其引发的晶格畸变和位错扩散机制。此外，原子探针断层扫描（APT）还揭示了辐照引起的基体成分偏析和Si纳米团簇的形成。这些发现已经确定了RAFM钢的辐照硬化性质，并可能提供更好的辐照损伤机制的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.