Metallurgical characterization of coupled carbon diffusion and precipitation in dissimilar steel welds [* Cross-Reference *]

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Mas, Fanny; Tassin, Catherine; Valle, Nathalie; Robaut, Florence; Charlot, Frédéric; Yescas, Miguel; Roch, François; Todeschini, Patrick; Bréchet, Yves, 2026, "Metallurgical characterization of coupled carbon diffusion and precipitation in dissimilar steel welds [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.AUPW1V, LIST Open Repository, V1
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Description
The complex microstructures developed during post-welding heat-treatment in the vicinity of the fusion line between a ferritic and austenitic steel were examined in the case of submerged arc welded 18MND5/309L dissimilar joints. Quantitative measurements of the carbon distribution in the as-welded and post-weld heat-treated conditions were performed by both wavelength dispersive spectrometry and secondary ion mass spectrometry. The extent of carbon diffusion was confirmed by hardness profiles performed by nanoindentation. On the low-alloy ferritic side, decarburization resulted in cementite dissolution allowing the evolution of the bainitic structure toward a large-grained ferritic region. In the weld metal, the carbon content reached unusually high levels and an intense precipitation of chromium-rich carbides was observed in both the interfacial martensitic layer and the austenitic weld metal. The evolution of the precipitation as a function of the distance from the interface was analyzed in terms of crystallography, chemistry, volume fractions, and size distributions. Automated crystal orientation mapping in a transmission electron microscope allowed identification of the precipitates extracted on carbon replicas from both the martensitic and austenitic matrices. A 3D reconstruction of the carbides population in the martensitic layer was performed by serial cutting with a focused ion beam: M7C3 and M23C6 were found to coexist in the two carburized regions, but displayed different sizes, compositions, and morphologies, depending on their location with respect to the fusion line. This evolution in terms of precipitation was analyzed taking into account the local microstructure and composition. (2016-05-01)
***This entry has been automatically imported via Infodoc(ASO) CSV by LIST harvest scripts. Please refer to https://doi.org/10.1007/s10853-016-9792-z for the original and latest version of the dataset and data downloads*** (2026-06-10)
Subject Other
Keyword submerged arc welded, complex microstructures developed, inf, dissimilar joints, arc welded
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