Magnetic Study of Martensitic Transformation of Stainless Steel

Abstract

Saturation magnetization and roll magnetic anisotropy were measured for several single- and poly-crystals of 18 Cr-12 Ni-70 Fe 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 polycrystal, (001) [100], (001)[110] and (110)[1\bar10] 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) [1\bar10] 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 tran...