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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12402
Title: Study of mechanism, microstructure and mechanical properties of activated flux TIG welded P91 Steel-P22 steel dissimilar metal joint
Authors: Kulkarni A.
Dwivedi D.K.
Vasudevan M.
Published in: Materials Science and Engineering A
Abstract: The current work investigates activated flux TIG welding of dissimilar steel combination of 8 mm thick plates of Modified 9Cr-1Mo (P91) steel and 2.25Cr-1Mo (P22) steel. The effect of different fluxes namely- SiO2, TiO2, Cr2O3, MoO3 and CuO on the weld bead geometry was investigated. The possible mechanism for the increase in depth of penetration has been discussed. The integrity of the weld joint made with MoO3 flux was investigated by evaluating metallurgical and mechanical characteristics in as-welded and post weld heat treated (750 °C/2 h) conditions. The occurrence of carbon migration was confirmed by optical microscopy and elemental redistribution through EPMA analysis. The precipitation of carbides of M23C6 type in the carbon enriched zone was confirmed through TEM analysis. The beneficial effect of A-TIG welding in reducing the widths of carbon enriched/depleted regions at the P22 steel-weld interface after post weld heat treatment has been discussed with the help of DICTRA simulations. The weld joints failed from P22 steel base metal in both as-welded and post weld heat treated conditions during a tensile test. The impact toughness was found to be improved after post weld heat treatment. © 2018 Elsevier B.V.
Citation: Materials Science and Engineering A (2018), 731(): 309-323
URI: https://doi.org/10.1016/j.msea.2018.06.054
http://repository.iitr.ac.in/handle/123456789/12402
Issue Date: 2018
Publisher: Elsevier Ltd
Keywords: A-TIG
Carbon migration
DICTRA
Dissimilar metal joint
EPMA
Marangoni convection
TEM
ISSN: 9215093
Author Scopus IDs: 56611911300
7004266679
7006325030
Author Affiliations: Kulkarni, A., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, 247667, India
Dwivedi, D.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, 247667, India
Vasudevan, M., Advanced Welding Processes and Modeling Section, Materials Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
Corresponding Author: Kulkarni, A.; Department of Mechanical and Industrial Engineering, Indian Institute of TechnologyIndia; email: anup.mme2015@iitr.ac.in
Appears in Collections:Journal Publications [ME]

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