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Study on microstructure and mechanical properties of dissimilar steel joint developed using friction stir welding

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Abstract

In the present study, microstructure and mechanical properties of dissimilar weld of structural steel and ferritic stainless steel (FSS) plates of thickness 3 mm were investigated. The plates were butt welded by friction stir welding and defect-free welds were produced at a traverse speed of 20 mm/min and rotational speed of 508 rpm using a tungsten carbide tool. The weld joint consisted of alternate bands of both steels resembling an onion ring pattern. In the weld joint, six distinct regions were found including both the base metals. The stir zone of structural steel revealed refined grain structure of ferrite, pearlite, and martensite whereas in ferritic stainless side, highly refined ferritic grains with grain boundary martensite was observed and also confirmed by x-ray diffraction (XRD). The hardness of the weld joint varies from 186 to 572 HV. This scatter of hardness in stir zone is due to the presence of metal from both sides. The ultimate tensile and yield strengths of the transverse weld specimens was higher than the structural steel base metal whereas lower than the ferritic stainless steel, having fracture from structural steel side.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India

    Gaurav Sharma & D. K. Dwivedi

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  1. Gaurav Sharma
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  2. D. K. Dwivedi
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Correspondence to Gaurav Sharma.

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Sharma, G., Dwivedi, D.K. Study on microstructure and mechanical properties of dissimilar steel joint developed using friction stir welding. Int J Adv Manuf Technol 88, 1299–1307 (2017). https://doi.org/10.1007/s00170-016-8763-5

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  • DOI: https://doi.org/10.1007/s00170-016-8763-5

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