抄録
Transmission Kossel technique has been applied in an attempt to elucidate the origin of the potential nuclei of the celebrated (110)[001] secondary grains in the high induction grain oriented silicon steel. The (110)[001] secondary recrystallization nuclei, which are inherited by the structure memory from the original hot-rolled texture, are not the recrystallized grains in the vicinity of the steel surface of the hot-rolled steel, but the polygonized (110)[001] grains elongated toward the rolling direction at about 1/10 depth from the steel surface. The polygonized (110)[001] grain consists of several matrix bands containing the transition band and normally gives the line diffusing TK patterns. There are the highly oriented (110) [001] areas with the line sharpening TK patterns inside the polygonized (110)[001] grains, by which they appear to be guarded. The highly oriented (110)[001] areas are compatible with the colonies of the large primary recrystallized (110)[001] grains inherited even after the subsequent alternating operations of the cold rolling and the recrystallization annealing. It is considered that the potential nuclei of (110)[001] secondary grains will generate from the highly oriented (110)[001] areas, the preferential formation of which is indispensable for the development of the celebrated (110)[001] secondary grains during the secondary recrystallization annealing.
