MICROSCALE TEXTURE AND RECRYSTALLIZED ORIENTATIONS OF COARSE-GRAINED 3-PERCENT-SI-STEEL ROLLED AT HIGH-TEMPERATURE

Recovered and recrystallized crystal orientations of a coarse grained 3% Si-steel hot rolled at 1280 degrees C were examined. Deformed sampl es exhibited a recovered structure comprised of subgrains. Recrystalli zed grains with unique orientations emerged along the original grain b oundaries during holding at the rolling temperature for 6.5s. With the aid of the automated EBSD orientation measurement with two dimensiona l scan, it became possible to map the orientations of the subgrains wh ich were the minimum units of orientation in the present case. Near th e original grain boundary, to an extent of several hundreds of microns , the orientation of the subgrains were scattered or continuously rota ted due to the constraint by the grain boundary. The orientations of a number of the subgrains near the original grain boundaries in the def ormed sample were measured, and the subgrains having large misorientat ion with the matrix, which were thought recrystallization nuclei, were found. The recrystallized grains in the sample held for 6.5s at 1280 degrees C, as well as both the recrystallization nuclei and the contin uously rotated subgrains near the original grain boundaries in the imm ediately quenched specimen, often showed a rotational relationship aro und an [110] axis on ND plane with the deformed matrices.