鉄の相変態における強磁場効果の新しい展開と「スーパーメタル」開発への応用

概要

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Two novel effects of external magnetic fields on the microstructures of steels were discovered curing the course of the Ferrous Super Metal project. First, the application of magnetic fields during the γ→α and α→γ transformations in Fe-C alloys and steels was found to yield two-phase microstructures aligned along the direction of the applied magnetic fields. The developed structures were columnar or chain-like, depending on the extent of the transformation. The underlying mechanism is the occurrence of dipole-dipole interactions among ferromagnetic nuclei in the paramagnetic matrix. Secondly, the hardness of carbon steels, subjected to pearlitic transformation under a magnetic field gradient, was found to increase with the gradient value. Oversaturated carbon atoms introduced into the pearlitic ferrite are responsible for the hardening. The utility of these novel effects in the development of the "Ferrous Super Metal" is discussed.
社団法人日本磁気学会の論文
2000-10-01