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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4753
Title: Effect of graphene interlayer on resistance spot welded AISI-1008 steel joints
Authors: Das T.
Sahoo B.
Kumar P.
Paul J.
Published in: Materials Research Express
Abstract: Resistance spot welding of steel (AISI:1008) plates by incorporating an interlayer of graphene nanoplatelets (GNPs) is discussed here. The inclusion of GNP interlayer coating was achieved by solution drop casting and the GNP coated steel plates were joined together by the spot welding process. It was found that the weld strength of the joined steel plates depends primarily on the current/time used for electrical resistance heating. Lap-shear tests were carried out to find the peak load bearing strengths of the steel plates processed at varying current/time conditions and comparison was made between the GNP coated and bare samples. The failure mode was analyzed post lap shear test by SEM and it was observed that shear dimple rupture was the primary cause of failure. Interfacial and button pull-out failure was also witnessed at lower and higher welding currents respectively. Variation of the nugget size with different welding current and time parameters were also studied. Microstructural characterization was done by optical microscopy, SEM, AFM, Raman spectroscopy, and XRD. GNPs were typically found along the grain boundaries which led to the enhancement of strength by grain boundary strengthening mechanisms. Micro-hardness studies across the cross-section and a thorough study of subsurface hardness were carried out and it was found that there is an increase in hardness due to graphene entrapment. ¬© 2019 IOP Publishing Ltd.
Citation: Materials Research Express(2019), 6(8): -
URI: https://doi.org/10.1088/2053-1591/ab23d6
http://repository.iitr.ac.in/handle/123456789/4753
Issue Date: 2019
Publisher: Institute of Physics Publishing
Keywords: AISI 1008 steel
graphene interlayer
resistance spot welding
ISSN: 20531591
Author Scopus IDs: 57210739417
37063654800
55466569500
7402418687
Author Affiliations: Das, T., Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721302, India
Sahoo, B., Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721302, India
Kumar, P., Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721302, India
Paul, J., Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721302, India
Appears in Collections:Journal Publications [CE]

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