Abstract
Interfacial segregation of Mn was studied during the growth of partitioned ferrite allotriomorphs from austenite at 656 °C in a Fe-0.37C-3.0Mn-1.90Si alloy. Quantitative estimates of the segregation were obtained by combining scanning transmission electron microscopy (STEM) raster window scanning with simulation of the interaction of the electron beam with the sample. For most interfaces, the estimated Mn interfacial segregation is of the order of one-half monolayer. Certain interfaces, however, possessed a much lower level of Mn enhancement and showed no evidence of a Mn buildup in the parent austenite; it is considered that these were essentially immobile under the conditions of precipitate growth.
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