Time Sequential Observation of Abnormally Growing Goss Grains in Fe-3%Si Steel

Evolution of abnormally growing Goss grains in Fe-3%Si steel was observed time sequentially by electron backscattering diffraction (EBSD). For example, some specimens were heated at 1080oC for 5 min, then cooled, polished and observed by EBSD, whose procedure was repeated for 6 times. Highly irregular growth of Goss grains produced island and peninsular matrix grains. Once matrix grains became island or peninsular grains, they shrank much faster than before. This means that these grains were not formed by their low grain boundary mobility but formed by solid-state wetting. Also, grains trapped by impingement of abnormally-growing Goss grains shrank much faster.