Magnetic Study of Martensitic Transformation of Stainless Steel

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Saturation magnetization and roll magnetic anisotropy were measured for several single- and poly-crystals of 18Cr-12Ni-70Fe alloy as functions of roll reduction in various crystallographic directions. It was found that the saturation magnetization increases as the roll reduction does for a poly-crystal, (001)[100], (001)[110] and (110)[11^^-0] rollings, whereas it never increases for the (110)[001] rolling. This means that martensitic transformation does not take place for this rolling. The direction of easy magnetization was parallel to the roll direction for a poly-crystal, (001)[100] and (110)[11^^-0] rollings, while it was normal to the roll direction in the case of (001)[110] rolling until it was changed to parallel at about 60% reduction. Powder patterns on the surface of the rolled specimen showed that most of the martensitic transformation took place at the intersections of crossed slip bands which are parallel to {111} planes. A variation of saturation magnetization with martensitic transformation by cooling was also measured for poly-crystals from room temperature to 77°K. The mechanism of the transformation is discussed in terms of the dislocation theory.
社団法人日本物理学会の論文
1967-07-05