Sub-boundaries in abnormally growing Goss grains in Fe-3% Si steel

The initial stage of secondary recrystallization of Fe-3% Si steel was investigated using a transmission electron microscope with a focus on the existence of sub-boundaries in abnormally growing Goss grains. Ten randomly chosen abnormally growing Goss grains were observed to have sub-boundaries consisting of aligned edge dislocations. In contrast, no sub-boundaries were observed in the matrix grains. The misorientation angles of the observed sub-boundaries were in the range 0.1-0.5o, which was estimated based on the spacing between the dislocations.