Special misorientations and textural heredity in the commercial alloy Fe-3% Si

Abstract

It is shown that, upon the rolling of a (110)[001] Fe-3% Si single crystal to different degrees of deformation, special misorientations of types Σ3, Σ9, Σ11, Σ19a, Σ27a, Σ29b, and Σ33a can be formed between the elements of the mesostructure (deformation twins, deformation bands, and shear bands). In the process of deformation, these misorientations are retained; the Σ3 misorientation is partially transformed into close misorientations of the Σ17b and Σ43c types. The nuclei of primary recrystallization with orientations close to (110)[001] are formed at twins, in transition bands, and in shear bands retain regions of special boundaries with the deformed matrix, which correspond to special misorientations arising during deformation. The experimental data obtained make it possible to draw a direct analogy between the processes of phase and structural transformations. In the case of phase transformations, a characteristic feature is the presence of orientational relationships between the crystal lattices of the initial and arising phases, which manifests in the parallelism of the close-packed planes and directions. In the case of structural transformations, the role of orientation relationships is played by special misorientations.