Three-dimensional morphology of ferrite allotriomorphs nucleated on grain boundary edges in a low carbon steel were revealed by means of serial sectioning in conjunction with computer-aided three-dimensional reconstruction techniques. The typical morphology of ferrite allotriomorphs nucleated on grain boundary edges was of an elongated triangular pyramid. The length, width and thickness of ferrite allotriomorphs were measured on the basis of 3-D reconstructed images. The aspect ratio (length/width) of ferrite allotriomorphs was 4.5 on an average and scattered from 3 to 6. The measured sizes from the 3-D reconstructed images were smaller than those calculated, which was probably attributed to solute drag-like effect of manganese in the alloy.
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