Reimplantation of supporting legs on EAST divertor by electron beam brazing

IF 2.3 2区物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Materials and Energy Pub Date : 2025-03-10 DOI:10.1016/j.nme.2025.101918

Yu Tian , Yu-Ping Xu , Chang Xu , Wu-Qingliang Peng , An-Bang Wu , Jian-Ping Qu , Fang-Yong Du , Peng-Fei Zi , Qiang Li , Wan-Jing Wang , Hai-Shan Zhou , Guang-Nan Luo

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Abstract

The supporting legs at the back of the ITER-like W/Cu monoblock in the upper divertor of the Experimental Advanced Superconducting Tokamak (EAST) were found fractured due to the influence of electromagnetic forces, vertical displacement events (VDEs) and its own weight. This study developed an electron beam brazing (EBB) technique for the reimplantation of supporting legs. Defect-free bonding between Inconel 625 (IN625) alloy and pure tungsten was obtained with the tensile strength exceeding 110 MPa. Microstructural analysis revealed a columnar grain structure on the tungsten side and finer grains on the IN625 side. Nanoindentation tests indicated that the brazed interface exhibited a lower average stiffness of 1660 μN/nm and a lower average hardness of 1.48 GPa, ensuring enhanced plasticity and improved load-bearing capacity. This work provides a novel proposal to reimplant supporting legs on divertor components by EBB in terms of achieving microstructural refinement and high strength.

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电子束钎焊在EAST转向器上重建支腿

实验先进超导托卡马克（EAST）上导流器中，由于电磁力、垂直位移事件（VDEs）和自身重量的影响，发现iter型W/Cu单块后部支撑腿断裂。本研究开发了电子束钎焊（EBB）技术用于支撑腿再植。Inconel 625 （IN625）合金与纯钨无缺陷结合，抗拉强度超过110 MPa。显微组织分析表明，钨侧晶粒呈柱状，而IN625侧晶粒较细。纳米压痕试验表明，钎焊界面的平均刚度为1660 μN/nm，平均硬度为1.48 GPa，保证了塑性的增强和承载能力的提高。这项工作提供了一种新颖的建议，在实现微观结构的细化和高强度方面，通过EBB在分流器组件上重新植入支撑腿。

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来源期刊

Nuclear Materials and Energy Materials Science-Materials Science (miscellaneous)

CiteScore

3.70

自引率

15.40%

发文量

175

审稿时长

20 weeks

期刊介绍： The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.