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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Study on microstructure and mechanical property of linear friction welding on 9Cr reduced activation ferrite/martensite steel
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Study on microstructure and mechanical property of linear friction welding on 9Cr reduced activation ferrite/martensite steel

机译：线性摩擦焊接的微观结构和力学性能研究9CR减少活化铁氧体/马氏体钢

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摘要

The present work is concerned with the application of linear friction welding (LFW) process accessible for the weld-jointing of 9Cr reduced activation ferrite/martensite (RAFM) steels. Optical and electron microscopic characterization of microstructures were performed in various regions of the weld joint. Hardness, tensile and Charpy impact tests on the joined samples were processed to examine the mechanical property and reliability of the weld joints. It indicates that, hot plastic deformation induced by linear friction triggers continual dynamic recrystallization in the weld zone, along with high-density dislocation substructures formed by such severe deformation, which leads to a good combination of mechanical performances in the weld joint. Such linear friction welding comes beyond the rotational process restriction in conventional friction stir welding, and avoid significant oxide inclusions, porosities and coarsened grains brought by heat input as well. The work proves that the present LFW technique works well in the welding of 9Cr RAFM steels and inspires us of a future study on optimizing process parameters of the welding process for a better performance. (C) 2020 Elsevier B.V. All rights reserved.
机译：本作本作涉及线性摩擦焊接（LFW）工艺的应用，可用于9CR减少的活化铁氧体/马氏体（RAFM）钢的焊接接头。在焊接接头的各个区域中进行微观结构的光学和电子显微镜。加工连接样品上的硬度，拉伸和夏比冲击试验以检查焊接接头的机械性能和可靠性。它表明，线性摩擦引起的热塑性变形触发在焊接区中的连续动态再结晶，以及通过这种严重变形形成的高密度位错子结构，这导致焊接接头中的机械性能的良好组合。这种线性摩擦焊接超出了传统摩擦搅拌焊接中的旋转过程限制，并避免了通过热输入带来的显着氧化物夹杂物，孔隙率和粗糙的晶粒。该工作证明，目前的LFW技术在9CR RAFM钢的焊接中运行良好，并激发了一些关于优化焊接过程的过程参数的未来研究，以实现更好的性能。 （c）2020 Elsevier B.v.保留所有权利。

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