Grain-oriented electrical steel sheet and magnetic domain refinement method therefor
A grain-oriented electrical steel sheet includes a groove formed on a surface and a solidified alloy layer formed under the groove, wherein the solidified alloy layer includes particles of a certain average diameter.
1. A grain-oriented electrical steel sheet comprising:
a groove formed on a surface of an electrical steel sheet; and
a solidified alloy layer formed under the groove and from the groove to a base portion of the steel sheet,
wherein the solidified alloy layer includes particles of which an average particle diameter is from 1 to 7 μm,
wherein a thickness of the solidified alloy layer is 0.6 to 3.0 μm.
2. A grain-oriented electrical steel sheet comprising:
a groove formed on a surface of an electrical steel sheet; and
a solidified alloy layer formed under the groove and from the groove to a base portion of the steel sheet,
wherein the solidified alloy layer includes recrystallized particles of which an average particle diameter is from 8 to 20 μm after stress relaxation annealing,
wherein a thickness of the solidified alloy layer is 0.6 to 3.0 μm.
3. The grain-oriented electrical steel sheet of claim 1 , further comprising
a non-metallic oxide layer formed on the surface of the electrical steel sheet.
4. The grain-oriented electrical steel sheet of claim 3 , wherein the non-metallic oxide layer includes Mg 2 SiO 4 , Al 2 SiO 4 , or Mn 2 SiO 4 .
5. The grain-oriented electrical steel sheet of claim 3 , further comprising an insulating coating layer formed on the non-metallic oxide layer.
6. The grain-oriented electrical steel sheet of claim 1 , wherein
the groove is linear and is formed at an angle of 82° to 98° with respect to a rolling direction of the electrical steel sheet.
7. The grain-oriented electrical steel sheet of claim 1 , wherein
a depth D of the groove is from 3% to 8% of the thickness of the electrical steel sheet.