Grain Boundary Characteristics in Grain Oriented Silicon Steel

Kumano, Tomoji; Haratani, Tsutomu; Ushigami, Y.

doi:10.2355/isijinternational.44.1888

Cited by 12 publications

(8 citation statements)

References 17 publications

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“…The intensities did not vary much through the thickness compared with HGO's case. 10) IcS1 and IcS5 to Goss orientation were stronger than the other S-values at each location as is wellknown.…”

Section: Secondary Recrystallization Behaviorsupporting

confidence: 63%

“…8 and for HGO. 10) Although S1 to Goss was major in the primary recrystallization texture in Fig. 7, S1 was not so major at the lower temperature.…”

Section: High Angle Misorientation (General Grainmentioning

confidence: 82%

“…This figure gives the quantitative explanation of the secondary recrystallization phenomenon. The intervals between the onset and end of secondary recrystallization for CGO and HGO 10) are the same, around 50°C. This means that the grain of CGO might grow considerably fast compared with HGO, because the temperature range for CGO is lower than that for HGO, which might also mean that the dominant grain boundary of CGO can move faster than that of HGO at a specific temperature.…”

Section: Full-cycle Secondary Recrystallization Annealingmentioning

confidence: 90%

“…This means that the S5 grain boundary could move faster than the others, which supports the study of Lee et al On the other hand, in the case of HGO, the S9 grain boundary might move faster than others. 10) Therefore, for HGO, the S9 grain boundary might be dominant, and for CGO, the S5 might be dominant for secondary recrystallization for the same Goss secondary orientation, i.e., in this case, the S5 grain boundary, rather than the S9 boundary, might play a significant role. Considering that the specific grain boundary would vary, this result does not contradict the CSL-model.…”

Section: Primary Recrystallization Texturementioning

confidence: 99%

“…The authors have already reported by the extraction experiment, in the case of HGO, that S9 and S5 grain boundaries against Goss orientation are the most frequent in the primary texture, but no S9 and few S5 boundaries can be observed, 10) while specific grains, which have S3 or a high angle misorientation relation, are often observed. As the extraction temperature increases, the frequency of S3 decreases and that of GGB (general grain boundary) increases.…”

Section: Introductionmentioning

confidence: 99%

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Grain Boundary Characteristics of Isolated Grains in Conventional Grain Oriented Silicon Steel

Kumano

Ushigami

2007

ISIJ Int.

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During the secondary recrystallization of GO, isolated grains are often observed in secondary-recrystallized Goss grains (matrix). In an extraction experiment, the crystallographic relations between single isolated grains and matrix grains respectively were investigated in the case of CGO. Although the S5 grain boundary to the Goss orientation was the most frequent in the primary recrystallization texture, no S5 boundary could be observed at the onset temperature of secondary recrystallization; hence it was concluded that the S5 boundary was most mobile in this case. On the other hand, in the case of HGO, it has already been reported that the S9 is most mobile. The reason why the dominant grain boundary may differ for the same Goss orientation could be the temperature dependency of the grain boundary features, i.e., mobility and/or grain boundary energy. Furthermore, the S3 was more mobile than GGB (general grain boundary) at the higher temperature, which corresponded to the lower temperature range of HGO.KEY WORDS: conventional grain oriented silicon steel; grain boundary; recrystallization texture; CSL; secondary recrystallization.ISIJ International, Vol. 47 (2007), No. 6, pp. 890-897 duction 12) and the main inhibitors were finely dispersed MnS and Cu-S. It was cold-rolled to a thickness of 0.34 mm with a reduction of 54.7 %. Primary Recrystallization TextureThe primary recrystallization textures were measured using the X-ray diffraction method before the extraction experiment and evaluated by the complete {100} pole figures measured at 9 kinds of depths from one surface to another throughout the entire thickness. Figure 1 shows the specimen-preparation for X-ray measurement. The thickness of the specimens was around 60 mm. Nine specimens (p1, p2, … , p9) for one series were taken from each 10 % location: 10.3, 19.1, 29.4, 39.7, 50.0, 60.3, 70.6, 80.9 and 89.7 % respectively and three series were measured in order to improve the precision. The data were averaged at each location and turned down at the central location, i.e., the datum at the central location was the average of 3 data and the data at other locations were the average of 6 data. These data were then three-dimensionally analyzed in crystal orientation using the Vector method.13) The intensity of any coincidence orientation, 14) Si, for a recognized nucleus orientation, is expressed as IcSi, which means the percentage for total intensity. In this study, Goss orientation ({110}͗001͘) and its IcSi (iϭ1-29) were calculated. Extraction ExperimentThe specimens, of which the dimension was 0.34 mm (thickness)ϫ80 mm (width)ϫ220 mm (length), coated with the annealing separator, consisting mainly of MgO, were extracted during secondary-recrystallization annealing, which was performed in a 25 % N 2 and 75 % H 2 atmosphere from room temperature to 1 025°C at a heating rate of 15°C/h. They were extracted at 25°C intervals from 850 to 1 025°C. Secondary Recrystallization BehaviorThe microstructures were optically observed and the magnetic properties, flux de...

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Section: Secondary Recrystallization Behaviorsupporting

confidence: 63%

“…8 and for HGO. 10) Although S1 to Goss was major in the primary recrystallization texture in Fig. 7, S1 was not so major at the lower temperature.…”

Section: High Angle Misorientation (General Grainmentioning

confidence: 82%

Section: Full-cycle Secondary Recrystallization Annealingmentioning

confidence: 90%

Section: Primary Recrystallization Texturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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