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Journal of Materials Engineering and Performance

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20-04-2022 | Technical Article

Microstructure, Mechanical, and Electrochemical Evaluation of Chrome-Manganese Stainless Steel Activated Tungsten Inert Gas Welded Joint

Published in: Journal of Materials Engineering and Performance | Issue 11/2022

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Abstract

This study addresses the use of activated flux (MoO₃, SiO₂, TiO₂, and CaO) for the TIG welding of chrome-manganese (Cr-Mn SSs) stainless steel. Bead-on-plate welding trials were performed to investigate the weld bead microstructure, mechanical, and electrochemical properties. The behavior of activated flux powder was studied with the orientation of fluctuations of arc voltage and dissolved oxygen in the weld bead. It was observed δ-ferrite phase evolution on employing activated flux. TiO₂-assisted weld was found to have the highest mechanical properties than other TIG and ATIG welds. The presence of secondary phases (Cr₂₃C₆) in the heat-affected zone was confirmed with x-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) technique. The tensile and impact test failures were observed in all TIG and ATIG welding processes at the weld zone. Numerous ductile ridges, voids, and dimples were seen on all tensile and impact fracture surfaces. Improvement in the hardness value was observed in the weld zone of ATIG weldment than No flux. CaO-assisted weldment offers excellent pitting corrosion resistance \((\mathrm{Epitt}=-130.164\mathrm{ mv})\) than other TIG and ATIG weldments. The degree of sensitization (DOS) of the ATIG welded sample was observed higher than the No flux TIG weld.

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Title: Microstructure, Mechanical, and Electrochemical Evaluation of Chrome-Manganese Stainless Steel Activated Tungsten Inert Gas Welded Joint
Publication date: 20-04-2022
Published in: Journal of Materials Engineering and Performance / Issue 11/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-022-06894-2

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