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

2013

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Abstract-The effect of the copper content, initial structure, and scheme of treatment on the magnetic proper ties of an ultra thin grain oriented electrical steel has been investigated. In the material with copper and an initial sharp texture, the nucleation of new grains upon primary recrystallization is connected with deformation twins; in the samples without copper and with copper and diffuse texture, it is connected predominantly with shear bands and transition bands. Upon heating at a rate of ~0.004 K/s, the temperature of primary recrystallization in the copper bearing samples is considerably higher than in the copper free material. Upon heating at a rate of 4 K/s the appearance of new grains occurs almost simultaneously for all of the studied samples. In the samples with copper and initial sharp texture after annealing at 1050°C, a significant part of the volume is occupied by grains that had undergone normal grain growth; in the samples without copper and with copper and diffuse tex ture, anomalous growth is hardly observed at all. To obtain high final magnetic properties of the ultra thin grain oriented electrical steel produced by the Littmann method, it has been suggested to use an grain oriented elec trical steel with 0.5% Cu that exhibits the diffuse orientation of grains as the workpiece.

Section: Discussion Of Resultsmentioning

confidence: 99%

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

2013

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“…During deforma tion, the near surface zones of the strip exist in a rather changed stressed condition induced by friction, which probably leads to their additional reorientation. In this case, during deformation, along with the sliding on the main {112}〈111〉 system [14], additional sliding takes place in several {110}〈111〉 systems. This most likely leads to the reorientation of the crystal lattice to the orientations of the observed spectrum (deviation from the (110) plane does not exceed 20°).…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2013

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Abstract-After the primary recrystallization of a preliminarily deformed (110)[001] single crystal, the tex ture 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 orienta tions {120}͗210͘…{351}͗103͘. 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 repre sented by a quartet of orientations related with the initial Goss orientation by a rotation around [011], ,[101], and 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 ͗110͘ axes to close angles).

“…The primary recrystallization (PR) nuclei with the Goss orientation formed in the deformed Fe-3% Si alloy can originate in transition bands, shear bands, and Neumann bands (deformation twins) [1][2][3][4][5][9][10][11]. It has been shown in works [10][11][12] that the formation of the nuclei of Goss grains at twins is accompanied by the appearance and evolution of special misorienta tions (Σ3 → Σ9 and Σ27) in the crystal mesostructure.…”

Section: Introductionmentioning

confidence: 99%

“…The role of special boundaries and, hence, special misorientations in the processes of texture formation that evolve during deformation and recrystallization remains the subject of the active attention of research ers [6,[10][11][12][13][14][15]. This work deals with the study of pro cesses of the appearance of special misorientations during the formation of the deformation and transi tion bands and their role in the origination of PR nuclei.…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown in works [10][11][12] that the formation of the nuclei of Goss grains at twins is accompanied by the appearance and evolution of special misorienta tions (Σ3 → Σ9 and Σ27) in the crystal mesostructure. The appearance of grains with the same orientation at different objects of the mesostructure during PR allows one to suppose the existence of a unified mech anism of the PR grain formation and relate it to special misorientations.…”

Section: Introductionmentioning

confidence: 99%

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Formation of special misorientations related to transition bands in structure of deformed and annealed single crystal (110)[001] of Fe-3% Si alloy

et al. 2013

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Abstract-A transition band between two deformation bands retains for the most part the orientation (110) [001] and shrinks to a thin interlayer or boundary with increasing degree of deformation. At a certain stage of deformation, the microvolumes that are arranged along the interface of the bands become adjusted to special misorientations. During primary recrystallization, cube on edge (Goss) grains, which grow from the transition band, have portions of special boundaries common with the deformed matrix; these boundaries were found earlier between the deformation bands. This indicates that the local domains with special misori entations formed at the stage of cold deformation transform during annealing into the corresponding pri mary recrystallization nuclei.