Effect of Cold Rolling Reduction on Secondary Recrystallization in Grain-oriented Electrical Steel Produced by Single-stage Rolling Process

Abstract

A study was made on the effect of cold rolling reductions of 80 to 94% on secondary recrystallization in grain-oriented electrical steel produced by the single-stage cold rolling process. The following conclusions were derived from the study.
(1) As the cold rolling reduction increases, secondary-recrystallized grains increase in diameter, and fine grains other than Goss oriented grains start to develop and eventually fill the entire sheet section. This may be ascribed to the decrease in the amount of Goss nuclei in the primary-recrystallized matrix as a result of the increased cold rolling reduction.
(2) As the cold rolling reduction increases, secondary-recrystallized grains, other than fine grains, increase in sharpness to the ideal Goss orientation. This may be ascribed to the increase in the amount of orientations in the Σ9 coincidence relationship with the ideal Goss orientation.
(3) Secondary recrystallization is affected more greatly by the change in the texture than by the change in the diameter of primary-recrystallized grains as a result of the increased cold rolling reduction.