Xusheng Qian , Ruoyu Li , Tongtong Liu , Kejin Zhang , Hao Lu
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The Formation Mechanism of Martensite and Type II Boundary in 52M/SA508-3 Joints under Different Pulse Frequencies and Their Effects on Helium Bubbles
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 %.
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.
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