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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Properties of Resistance-Spot-Welded AISI-1008 Steel Lap Joints Using Multiwalled Carbon Nanotubes as an Interlayer
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Microstructure and Mechanical Properties of Resistance-Spot-Welded AISI-1008 Steel Lap Joints Using Multiwalled Carbon Nanotubes as an Interlayer

机译：电阻点焊焊接AISI-1008钢圈接头的微观结构和力学性能使用多壁碳纳米管作为中间层

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摘要

The present study deals with the microstructural analysis and mechanical properties of resistance-spot-welded AISI-1008 steel joints utilizing multi-walled carbon nanotubes (MWCNTs) as an interlayer. A thin layer of approximately 50 mu m thickness of MWCNTs coating is used as an interlayer between the mating surfaces of the lap joints. The microstructural investigation of the weld nugget was accomplished by light microscopy, scanning electron microscopy, and transmission electron microscopy. An enhancement of similar to 45% in weld strength at one of the welding parameters is obtained in lap-shear tensile tests due to the MWCNT interlayer. The shear dimple fracture is the prime mode of failure as has been confirmed by fractography. At lower and higher welding energies, interfacial and button pull-out modes of failure were observed to occur, respectively. Microhardness studies along the nugget cross section revealed a marginal increase in hardness owing to the presence of MWCNTs and also the interplay of various strengthening mechanisms.
机译：本文研究了以多壁碳纳米管（MWCNT）为中间层的AISI-1008钢电阻点焊接头的微观结构和力学性能。一层约50μm厚的MWCNTs涂层用作搭接接头配合面之间的夹层。通过光学显微镜、扫描电子显微镜和透射电子显微镜对熔核的微观结构进行了研究。在搭接剪切拉伸试验中，由于MWCNT夹层的存在，在其中一个焊接参数下，焊接强度提高了45%。断口分析证实，剪切韧窝断裂是主要的失效模式。在较低和较高的焊接能量下，分别观察到界面和按钮拔出失效模式。沿熔核横截面的显微硬度研究表明，由于多壁碳纳米管的存在以及各种强化机制的相互作用，硬度略有增加。

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