Abstract
Scanning transmission electron microscopy (STEM) was conducted on welds exhibiting a variety of skeletal, or vermicular ferrite morphologies in addition to one lathy ferrite morphology. These ferrite morphologies result from primary ferrite solidification followed by a solid state transformation upon cooling. During cooling, a large fraction of the ferrite transforms to austenite leaving a variety of ferrite morphologies. Comparison of composition profiles and alloy partitioning showed both the skeletal and lathy ferrite structures result from a diffusion controlled solid state transformation. However, the overall measured composition profiles of the weld structure are a result of partitioning during both solidification and the subsequent solid state transformation.
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Brooks, J.A., Williams, J.C. & Thompson, A.W. Microstructural origin of the skeletal ferrite morphology of austenitic stainless steel welds. Metall Trans A 14, 1271–1281 (1983). https://doi.org/10.1007/BF02664809
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DOI: https://doi.org/10.1007/BF02664809