Morphological evidence that Goss abnormally growing grains grow by triple junction wetting during secondary recrystallization of Fe–3% Si steel

Microstructural features near the growth front of Goss abnormally growing grains (AGG) were investigated in the initial stage of secondary recrystallization of Fe–3% Si steel. In order to obtain three-dimensional information about these microstructures, serial section images were obtained by repeated polishing, which revealed that the grains with negative curvatures are three-dimensionally connected to the Goss AGG. These morphologies indicate that the Goss AGG underwent solid-state wetting along the triple junction of small matrix grains at its growth front.