極薄方向性けい素鋼板における結晶粒径と鉄損

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  • Relationship between Grain Size and Iron Loss of Very Thin Grain Oriented Silicon Steels
  • ゴクウス ホウコウセイ ケイソ コウハン ニ オケル ケッショウ リュウケイ

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It was found that the grain size of very thin(40μm) grain oriented silicon steels can be controlled by selecting conditions of the annealing for making the grain texture of (110) [001] on the sheets. The grain size became smaller by the annealing of higher temperature or larger heating rate. The magnetic domains and losses of the very thin grain oriented silicon steels with different grain sizes were observed. The eddy current losses of the sheets were decreased with decreasing the grain size because steels with smaller grains have narrower magnetic domain wall spacings. The hysteresis losses were independent on the grain size. Therefore the iron loss of the very thin grain oriented silicon steels could be controlled by the grain size. In this work it was clarified that we can obtain the very thin grain oriented silicon steels with very low iron loss by controlling the annealing condition.

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