Katsuro Kuroki1, K\=ohei Fukawa1 and Toshiya Wada1
1Process Technology R & D Laboratories, Nippon Steel Corporation, Kitakyushu
Artificial domain control has been applied to grain oriented silicon steel sheets. Lines are scratched on the surface of the sheets, with a rotary ball of 0.7 mm diameter on one side of the sheet. Directions of scratching 0°ree(rolling), 10°ree, 20°ree, 30°ree, 45°ree, 60°ree, and 90°ree(cross rolling) from the rolling direction. The interval of the lines is 10 mm. Scratching parallel to the cross rolling direction improves the total loss of the rolling direction and causes the refinement of the 180°ree domain which is the main domain in the (110) oriented silicon steel. Scratching parallel to the rolling direction improves the total loss of the cross rolling direction, and improves that of the 45°ree direction slightly. Scratching parallel to 20°ree to 60°ree directions improves the total loss of both the rolling and cross rolling directions. The improvement of the total loss due to scratching is considered to be caused by slight local plastic deformation produced by scratching.
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