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US 2019/0321920 A1Published application
Grain-oriented electrical steel sheet and magnetic domain refinement method therefor
AssigneePosco
InventorsOh-Yeoul KWON, Se-Min PARK, Jong-Tae PARK, Won-Gul LEE
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Abstract
A grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention incudes a groove formed on a surface and a solidified alloy layer formed under the groove, wherein the solidified alloy layer includes recrystallized particles of which an average particle diameter is 1 to 8 μm.
Claims16
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,
- wherein the solidified alloy layer includes recrystallized particles of which an average particle diameter is from 1 to 10 μm.
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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,
- wherein the solidified alloy layer includes recrystallized particles of which an average particle diameter is from 1 to 20 μm after stress relaxation annealing.
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A magnetic domain refining method of a grain-oriented electrical steel sheet, comprising:
- preparing a grain-oriented electrical steel sheet;
- irradiating a laser to a surface of the grain-oriented electrical steel sheet to form a groove;
- and
- quenching a portion where the groove is formed with a cooling speed of 400 to 1500° C./s.
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Dependencies are inferred from the claim text.