| Effects of melting process of 50%Ni-50%Fe alloy on it`s non-metallic inclusion, recrystallization and magnetic properties, especially coercive force were studied. Alloys which were deoxidized by 1% of Mn under the atmosphere of 5mmHg Helium showed good hot workability. and non-metallic inclusions were remarkably reduced by casting in sand mold compared with the alloys casted in metal mold. Non-metallic inclusions increased the coercive force of the alloy and reduced the grain size of the primary recrystallization after 2hr-annealing at 1,000℃. Coercive forces of 4 alloys was lowered, and approached to 0.1 Oe after 8hr-annealing at 1,200℃, regardless the amount of inclusions, supposedly due to the purification effect of dry hydrogen. |
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