EFFECT OF REDUCTION OF COLD-ROLLING ON SECONDARY RECRYSTALLIZATION OF GRAIN-ORIENTED ELECTRICAL STEEL PRODUCED BY SINGLE-STAGE COLD-ROLLING PROCESS

Previously, authors reported the effect of the reduction in cold rolling which is an important factor for secondary recrystallization of the grain-oriented electrical steel produced by the single-stage cold rolling process by varying final thickness. Then, the effect of the reduction was overlapped with that of final thickness. This time, a study has been made concerning with the effect of the reduction on secondary recrystallization by varying the thickness of hot-bands, i.e., by keeping final thickness in the same level. The following are conclusions. (1) With the increase in the reduction, at first, the size of the secondary grains gets larger, then, fine grains begin to appear among large secondary grains, and finally, fine grains occupy all part of the specimen. This phenomenon is considered to be attributed to the decrease in the nuclei of (110) [001] orientation accompanied by the increase in the reduction. (2) With the increase in the reduction, the orientations of secondary grains concentrate on the ideal (110) [001] orientation. This phenomenon is considered to be attributed to the increase in the intensity of the SIGMA-9 coincident orientation with the ideal (110) [001] orientation in the primary matrix.