Conventional thermomechanical processing of low‐carbon steels leads to a characteristic texture dominated by a strong <111>//ND fiber after recrystallization. The latter texture is beneficial for certain applications, such as deep drawing, while it is detrimental for others, including magnetic applications. With regard to magnetic applications, there is an ongoing effort to improve the final texture in ferromagnetic materials such as Fe–Si alloys used in transformers and electrical devices. Since the <100> directions are the axes of easy magnetization, it is essential to produce a texture that maximizes the volume fraction of grains with a <100> crystal direction in the flux direction. Bearing in mind that no phase transformation occurs during the processing of Fe–3%Si, plastic deformation and recrystallization are the prime controlling instruments to generate an appropriate microstructure and texture. In this study, the potential of severe plastic rolling deformation is considered. It is shown that, by strongly increasing the cold‐rolling reduction, the volume fraction of the unfavourable {111} component is significantly decreased and the specific {113}<136> component arises after annealing.
In the present work, the oriented nucleation origin of the recrystallized {h11}<1/h,1,2> fibre is characterized. Aiming to investigate the substructural evolution of <110>//RD fibre grains and {001}<110> grains in particular, a detailed microstructure and texture analysis is performed by high resolution orientation scanning microscopy on a cross-rolled sample. The reason to work with cross-rolled material is the increased incidence of rotated cube orientations after cross rolling. The present data have revealed the presence in the deformed substructure of a crystallite volume that has rotated towards the {311}<136> component in the interior of <110>//RD fibre grains as a result of a grain fragmentation process. Preliminary simulations of the deformation texture suggested that the observed orientation fragmentation might be produced by strain localizations of a shear band nature.
The recrystallization texture of highly cold deformed IF steels is addressed. The latter is characterized by the //ND fibre and a certain spread towards the {311} orientation. The //ND fibre is the optimum texture for enhanced deep-drawing properties whereas the presence of any other component, such as {311}, will deteriorate the plastic anisotropy of the material. Previous works concluded that the recrystallized {311} orientation results from an oriented nucleation process related to the plastic instability of {001} deformed grains. In the present work, the microstructural nature of such plastic instability is investigated by high resolution orientation scanning microscopy on an annealed IF sample after cross-rolling. Present data indicate that localized deformation in near {001} grains plays an essential role in the nucleation of {311} orientations.
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