Abstract
This article describes in detail the effect of the modes of metal transfer on the microstructure and mechanical properties of gas metal arc-welded modified ferritic stainless steel (SSP 409M) sheets (as received) of 4 mm thickness. The welded joints were prepared under three modes of metal transfer, i.e., short-circuit (SC), spray (S), transfer, and mix (M) mode transfer using two different austenitic filler wires (308L and 316L) and shielding gas composition of Ar + 5 pct CO2. The welded joints were evaluated by means of microstructural, hardness, notched tensile strength, Charpy impact toughness, and high cycle fatigue. The dependence of weld metal microstructure on modes of metal transfer and filler wires has been determined by dilution calculation, WRC-1992 diagram, Creq/Nieq ratio, stacking fault energy (SFE), optical microscopy (OM), and transmission electron microscopy (TEM). It was observed that the microstructure as well as the tensile, Charpy impact, and high cycle fatigue of weld metal is significantly affected by the mode of metal transfer and filler wire used. However, the heat-affected zone (HAZ) is affected only by the modes of metal transfer. The results have been correlated with the microstructures of weld and HAZ developed under different modes of metal transfer.
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Acknowledgments
The authors thank Mr. Sunil Sisodia, DGM (Quality), Salem Steel Plant, SAIL, Tamil Nadu, India, for providing the experimental materials and Mrs. D. Kanchanamala of IIT Madras, India, for her assistance in TEM work.
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Manuscript submitted June 16, 2011.
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Mukherjee, M., Pal, T.K. Influence of Mode of Metal Transfer on Microstructure and Mechanical Properties of Gas Metal Arc-Welded Modified Ferritic Stainless Steel. Metall Mater Trans A 43, 1791–1808 (2012). https://doi.org/10.1007/s11661-011-1069-1
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DOI: https://doi.org/10.1007/s11661-011-1069-1