Ferrite Content and Morphology of Type 308 Stainless Steel Weld Metal
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Authors
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Office of Inspection and Enforcement, U.S. Nuclear Regulatory Commission, Washington, D.C. ,US
H. I. Shaaban -
Atomic Energy Establishment, Cairo ,EGM. A. Shafey
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Atomic Energy Establishment, Cairo ,EGF. H. Hammad
Abstract
The variations of both ferrite number (FN) and morphology of Type AISI 308 deposited weld metal were studied. The predicted means of population of FN values at the top, transverse and longitudinal sections were estimated as 7, 5 and 5, respectively. The variation in FN values was attributed to various reasons such as the orientation of ferrite phase from section to section, weld metal solidification rate, cooling rate, and the dissolution of the ferrite phase due to subsequent thermal cycles in a multipass weld metal.
The morphology of the ferrite phase was investigated metallographically and found to vary from bead to bead. Three different morphologies were distinguished, namely vermicular, lacy and globular.
