Formation of Surface Texture and Anisotropy of Shape Memory Effect in an Fe-Mn-Si Alloy

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Formation of surace texture and its influence on shape memory effect in an Fe-Mn-Si alloy have been investigated, using specimens taken from the surface layer and from the central layer of the hot rolled sheet produced using a low-tempperature finishing. It was found that a shear texture with a major component of {001}<110> was formed in the surface layer of the sheet, resulting in a marked anisotropy of shape recovery strain, while a pure metal type rolling texture was formed in the mid-thickness, leading to a less anisotropy. A maximum of shape recovery strain at a given prestrain is obtained for the specimens with tensile axes parallel to the rolling direction (RD) or the transverse direction to the RD in the plane of the surface layer, <I>i.e</I>. the specimens with their tensile axes preferentially oriented to <110>. This suggests the possibility of improvement in shape memory effect of the whole sheet by a further spreading if the surface texture towards the central layer of the sheet if the rolling process is optimized.
社団法人日本鉄鋼協会の論文
1996-08-15