Developing novel high-Si 12 % Cr reduced-activation ferritic/martensitic cladding alloys via the cluster-formula approach and CALPHAD method

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design Pub Date : 2025-02-14 DOI:10.1016/j.matdes.2025.113722

Sen Ge , Ben Niu , Zhenhua Wang , Qing Wang , Qianfu Pan , Chaohong Liu , Chuang Dong , Peter K. Liaw

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引用次数: 0

Abstract

The corrosion-resistance in lead–bismuth eutectic (LBE) coolant at elevated temperatures of traditional reduced-activation ferritic/martensitic (RAFM) steels could not meet the requirements for the application of fuel claddings. Here, we designed four series of high-Cr/Si RAFM alloys via the cluster-formula approach and CALPHAD method, in which the combinations among alloying elements were tuned to investigate their influences on the martensitic matrix and precipitated phases. Three novel alloys were selected for further experimental verification. These alloys with heterostructures containing few ferrites in martensitic matrix possess high yield strength (423 ∼ 523 MPa at room-temperature, 240 ∼ 297 MPa at 823 K) and excellent strain-hardening ability, where the strengthening mechanisms were also discussed. The corrosion measurements in LBE at 773 K for 1000 h indicated that these alloys with trace amount (<3 %) of ferrite, especially the Al-containing alloy (Fe-11.3Cr-0.26 V-0.13Ta-1.3 W-1.0Si-0.22C-0.2Al-0.4Mn), possess prominent corrosion-resistance (∼ 2 μm oxide scales), much better than the commercial EP823 (∼ 22 μm). Moreover, this alloy has outstanding creep-resistant property, where the rupture lifetime under the extreme condition of 923 K/90 MPa is more than twice that of EP823. The present work provides a new strategy to efficiently develop novel high-Cr/Si RAFM alloys for nuclear application.

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.