The Formation Mechanism of Martensite and Type II Boundary in 52M/SA508-3 Joints under Different Pulse Frequencies and Their Effects on Helium Bubbles

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

Journal of Nuclear Materials Pub Date : 2024-11-07 DOI:10.1016/j.jnucmat.2024.155503

Xusheng Qian , Ruoyu Li , Tongtong Liu , Kejin Zhang , Hao Lu

引用次数: 0

Abstract

The white bright band (WBB) in the 52M/SA508–3 pulsed TIG joint is clearly visible after metallographic etching. Increased pulse frequency leads to enhancing oscillation of the molten pool and promoting deeper heat penetration. This results in the formation of the δ/γ phase boundary, facilitating martensite and Type II boundary formation within the WBB. High-frequency pulsing refines grain structure and increases grain boundaries, inhibiting helium bubble diffusion and growth. As frequency rises from 15 kHz to 50 kHz, WBB width increases from 20 μm to 35 μm, martensite proportion from 0 % to 77.1 %, and austenite grain size decreases 26.1 %.

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不同脉冲频率下 52M/SA508-3 接头中马氏体和 II 型边界的形成机理及其对氦气泡的影响

金相蚀刻后，52M/SA508-3 脉冲 TIG 接头中的白色光亮带 (WBB) 清晰可见。脉冲频率的增加会增强熔池的振荡，并促进热渗透的加深。这导致了 δ/γ 相边界的形成，促进了 WBB 内马氏体和 II 型边界的形成。高频脉冲细化了晶粒结构，增加了晶界，抑制了氦气泡的扩散和增长。当频率从 15 kHz 上升到 50 kHz 时，WBB 宽度从 20 μm 增加到 35 μm，马氏体比例从 0% 增加到 77.1%，奥氏体晶粒尺寸减少了 26.1%。

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.