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급속응고된 Fe-6.5wt% Si 강판의 미세조직과 자기적 특성에 미치는 열처리의 영향
황돈하,이갑호,이태행,구자명 ( D . H . Hwang,K . H . Lee,T . H . Lee,J . M . Koo ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
The alloying of 6.5wt% Silicon in iron decreases the magnetization and the anisotropy and minimizes the iron loss noticeably. But it is very difficult to make thin sheets because of its poor ductility which is due to an ordering reaction (body centered cubic to CsCl type crystal structure). However the ordering reaction can be suppressed by rapid solidification method. The cooling rate of rapidly solidified Fe-6.5wt% Si alloy is about 10³K/s and rapidly solidified structure are fine structure, cellular structure, dendrite and equiaxed grain from surface. The precipitates of DO₃Phase emerges on B₂matrix and the coercive force was 0.51 Oe (50cycle, 15KGauss) in Fe-6.5wt% Si alloy which was processed by heat treatment of 1150℃ for 1hr in high vacuum.
표면에너지를 이용한 고규소철 합금의 자기적 특성에 미치는 열처리 영향
구자명,이갑호 ( J . M . Koo,K . H . Lee ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.1
Different crystallographic planes, at a gas-metal interface, have different surface energy. To grow the (100) grains of 6.5wt%Si-Fe alloy preferentially, it was heat-treated in the atmosphere of sulfur by using the surface energy. When the specimen is heat-treated for 1 hour at 1175℃ by using the atmosphere of sulfur produced by heating at 75℃, (100) grains were grown to 3.5㎜. Owing to the growth of (100) grains, the coercive force was decreased to 2.1A/㎜, and the magnetic induction at 800(A/㎜) was increased to 1.61T.