Influence of Microstructure on Coercive Force of Pure Iron Powder Cores

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  • TAKASHITA Takuya
    Iron Powder & Magnetic Materials Research Department, Steel Research Laboratory, JFE Steel Corporation
  • NAKAMURA Naomichi
    Iron Powder & Magnetic Materials Research Department, Steel Research Laboratory, JFE Steel Corporation

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  • 純鉄圧粉磁芯の保磁力に及ぼす微視組織の影響
  • ジュンテツ アップンジシン ノ ホジリョク ニ オヨボス ビシ ソシキ ノ エイキョウ

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<p>The recrystallization behavior of pure iron powder cores during the annealing process core is visualized with the Grain Orientation Spread (GOS) map from an SEM/EBSD analysis, and found to be significantly inhomogeneous, leading to an inhomogeneous dislocation density distribution. Nevertheless, a conventional dislocation pinning model well describes the coercive force behavior if the average dislocation density is applied. The pinning model is modified to separate the influence of the grain boundary pinning, and the relationship between the coercive force and the microstructure is discussed comprehensively.</p>

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