Precipitation in CF-8M duplex stainless steel welds View Full Text


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Article Info

DATE

1983-01

AUTHORS

Ann M. Ritter, Michael J. Cieslak, Warren F. Savage

ABSTRACT

Welds of CF-8M, a cast 316-type stainless steel which normally solidifies as primary delta-ferrite, were induced to solidify as primary austenite by the addition of nitrogen to the shielding gas used during gas tungsten arc welding. Those welds which experienced a shift in solidification mode formed eutectic ferrite during the terminal transient stage of solidification. Primary delta-ferrite and eutectic ferrite are differentiated by their location in the dendritic microstructure. The shape of the ferrite/austenite interface tends to be rounded for primary delta-ferrite and more angular for eutectic ferrite. Elemental profiles were plotted from STEM/EDS measurements across the two types of ferrite, and showed differences between the composition of the austenite immediately adjacent to the primary delta-ferrite, as opposed to the eutectic ferrite. In addition, while the primary delta-ferrite/austenite interfaces are largely devoid of precipitation, the eutectic ferrite/austenite interfaces are densely covered with small precipitates ofx-phase. The mean stoichiometry of this phase has been calculated from STEM/EDS data on extraction replicas, and approximates Fe50Cr32Mo13Ni5. Intragranular inclusions were also examined and found to be complex, with most of them containing varying quantities of Mn, Si, and S. More... »

PAGES

37-44

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02643735

DOI

http://dx.doi.org/10.1007/bf02643735

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001527931


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