Materials Science Forum, Vol.408-4, 785-790, 2002
Deformation microtexture and recrystallized orientations in non-oriented electrical steel observed by high-resolution EBSD
The texture evolution during recrystallization was investigated in cold rolled 0.1%Si nonoriented electrical steel sheet. Both fine and coarse-grained hot rolled steel sheets of 2.6mm thickness were cold rolled by 42 to 81 % reduction. They were subsequently heat treated from 575degreesC to 900degreesC for partial recrystallization, and the microtexture evolution was observed. {111} recrystallized grains are frequently observed in initially fine-grained specimens with high reduction. They nucleated near original grain boundaries and its contribution became less important in initially coarse-grained specimen. The initial stages of recrystallizations were observed by high-resolution EBSD. Goss texture prevails in initially coarse grained specimens regardless of the cold reduction. These Goss grains nucleated mainly within {111}<112> oriented deformed grains along in-grain deformation microbands. The microstructure was similar to those reported for deformation bands in cold rolled single crystals with the same orientation. Recrystallization mechanism was discussed in accordance with an interpretation that the recrystallized nuclei is created by action of slip systems and accumulation of dislocations.