G. M. Rusakov

INTERRELATION BETWEEN THE ORIENTATIONS OF DEFORMATION AND RECRYSTALLIZATION IN HOT ROLLING OF ANISOTROPIC ELECTRICAL STEEL

The method of orientation microscopy (EBSD) is used to study the interrelation between deformation and recrystallization orientations in the structure of hot-rolled strip plate for the production of electrical anisotropic steel. It is shown that the interrelation between the orientations of recrystallized and deformed grains is implemented through a set of special off-orientations formed between the principal deformation orientations.

Special Misorientations and Textural Heredity in the Commercial Alloy Fe-3% Si

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.

Interrelation of Crystallographic Orientations of Grains in Aluminum Alloy AMg6 Under Hot Deformation and Recrystallization

The structure and texture of a pipe from steel AMg6 produced by the method of hot pressing (extrusion) are studied. The important role of special (special and “half-special”) boundaries in the process of dynamic recrystallization is described.

Effect of the grain orientation in the material used for the preparation of an ultrathin electrical steel on its texture and magnetic properties

The effect of initial orientation of samples on the magnetic properties and texture of ultrathin grain-oriented steel strips produced of them has been studied. In a number of cases, the samples with a larger initial deviation from the ideal (110)[001] orientation demonstrate a higher level of magnetic properties (if considering the total set of characteristics) in comparison with the samples with a small initial deviation. For the samples with a larger initial deviation, the final magnitudes of the magnetic induction obtained after the treatment exceed its initial magnitudes. Therefore, for producing an ultrathin grain-oriented electrical steel with high properties, a material with a scattered orientation of grains relative to the ideal (110)[001] orientation can be used.

Deformation-twinning-related features of primary recrystallization of (110)[001] single crystals of the Fe-3% Si-0.5% Cu alloy

In the regions of the deformed cube-on-edge single crystal of the Fe-3% Si-0.5% Cu alloy with an enhanced density of deformation twins, the nucleation of new grains during primary recrystallization (PR) occurs via several mechanisms. The majority of nuclei of PR are formed on twins as on substrates. The newly formed grains of PR are characterized by the presence of a cube-on-edge texture and are in special misorientations of the Σ3 type with respect to the twin orientation and of the Σ9 (Σ27) type with respect to the octahedral matrix. The mechanism of the formation of nucleation centers for PR on the twins as on substrates can be a splitting of the nonequilibrium special boundary Σ3. A significant role of special misorientations in the formation of the Goss texture upon PR has been shown experimentally.

Secondary recrystallization in Fe-3% Si alloy with (110)[001] single-component texture

After the primary recrystallization of a preliminarily deformed (110)[001] single crystal, the texture also has the preferred (110)[001] orientation. Furthermore, the texture contains weak orientations, a major part of which is formed at the sample surface and can be described by a spectrum of scattered orientations {120}〈210〉…{351}〈103〉. A further heating leads to two concurrent processes taking place in the samples, i.e., the normal growth of Goss grains and secondary recrystallization. Abnormally grown crystals are represented by a quartet of orientations related with the initial Goss orientation by a rotation around [011], [01

Specific features of cold deformation of a (110)[001] single crystal of an Fe-3% Si-0.5% cu alloy related to twinning

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Improving the production of superthin anisotropic electrical steel

], [101], and [10

Effect of copper content, initial structure, and scheme of treatment on magnetic properties of ultra-thin grain oriented electrical steel

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Mechanism of formation of shear bands upon cold deformation of a commercial Fe-3% Si alloy

] axes at an angle of ∼30°. The crystallographic relationship between the initial and final grain orientations can be explained by their closeness to special misorientations as follows: Σ9, Σ19a, Σ27a, and Σ33a (rotation around 〈110〉 axes to close angles).