Microstructure and corrosion property evolution of a surface-nanostructured 15–15Ti austenitic steel during immersion in liquid LBE at 550 °C

IF 2.8 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2024-10-22 DOI:10.1016/j.jnucmat.2024.155475

Da Wang , Weiqian Zhuo , Sirui Liu , Changquan Xiao , Wenjian Zhu , Bihan Sun , Xianfeng Ma , Ganfeng Yuan , Yulin Sun

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Abstract

This study investigated the compatibility of surface-nanostructured 15–15Ti austenitic steel in 550 °C LBE with an oxygen concentration of 5 × 10⁻⁷ wt.% for various exposure durations (759, 1638, 2404, and 3012 h). The results demonstrate that the grain size was reduced from 33.50 μm to the nano-scale after shot-peening (SP), achieving 17.62, 15.44, and 14.25 nm under SP pressures of 0.06, 0.15 and 0.25 MPa, respectively. The untreated steel experienced severe oxidation and dissolution corrosion, whereas the surface-nanostructured steel exhibited only mild oxidation and was resistant to dissolution corrosion. The enhanced corrosion resistance of surface-nanostructured steel is attributed to the higher protectiveness of the Cr-rich spinel layer and the less defective Ni-rich layer beneath it. Recrystallization occurred exclusively in the Ni-rich region, while the deformed steel underwent recovery during exposure. The thickness of the recrystallization layer was 2.9 μm at 759 h, increased to 8 μm at 1638 h, and remained stable thereafter. The size of recrystallized grains in SP-samples processed under pressure of 0.06 MPa and 0.15 MPa was approximately 2.92 μm, whereas it was about 1.32 μm for 0.25 MPa processed sample.

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表面纳米结构 15-15Ti 奥氏体钢在 550 °C 液态 LBE 中浸泡期间的微观结构和腐蚀性能演变

本研究调查了表面纳米结构 15-15Ti 奥氏体钢在 550 °C 氧浓度为 5 × 10-7 wt.%、不同暴露持续时间（759、1638、2404 和 3012 h）的 LBE 中的相容性。结果表明，喷丸强化（SP）后晶粒尺寸从 33.50 μm 减小到纳米级，在 0.06、0.15 和 0.25 兆帕的 SP 压力下分别达到 17.62、15.44 和 14.25 nm。未经处理的钢经历了严重的氧化和溶解腐蚀，而表面纳米结构钢仅表现出轻度氧化，并能抵抗溶解腐蚀。表面纳米结构钢耐腐蚀性能增强的原因是富铬尖晶石层的保护性更强，其下的富镍层缺陷更少。再结晶只发生在富镍区，而变形钢在暴露过程中发生了恢复。再结晶层的厚度在 759 小时时为 2.9 μm，在 1638 小时时增至 8 μm，此后保持稳定。在 0.06 兆帕和 0.15 兆帕压力下处理的 SP 样品的再结晶晶粒大小约为 2.92 微米，而在 0.25 兆帕压力下处理的样品的再结晶晶粒大小约为 1.32 微米。

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

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.