Primary recrystallization in a grain oriented silicon steel: on the origin of goss {110}&lt;001&gt; grains

Samajdar, Indradev; Cicale, S.; Verlinden, Bert; Houtte, Paul Van; Abbruzzesse, G.

doi:10.1016/s1359-6462(98)00288-7

Cited by 44 publications

(30 citation statements)

References 13 publications

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“…Optically these appeared as in-grain "fish-bone" like structures and were similar to the deformed structures commonly reported 2,10,[11][12][13][14][15] in low carbon steels. As metallographic observations of such grain interior strain localizations are rather common, [11][12][13] these are not repeated in the present paper.…”

Section: Resultssupporting

confidence: 83%

“…The main feature of the substructure with sufficient misorientation (i.e. other than pre-deformation grain boundaries) necessary for conventional metallographic [11][12][13] or OIM 2,10,15) visibility are the first generation MBs and the same can be considered as exact nature of the grain-interior strain localizations at least over the range of strain and strain path used in the present type of low carbon steel.…”

Section: On the Possible Nature Of The 'Grain Interiormentioning

confidence: 99%

“…[12][13][14] (II) Alternatively, Transmission Electron Microscope (TEM) observations in warm rolled IF (interstitial free) steel suggested that the so-called grain interior strain localizations are basically micro bands at angles of Ϯ35°with RD. 11) In absence of a comprehensive understanding regarding the nature and origin of the "fish-bone" like structures or grain boundary clusters at 37°with RD; previous studies 2, 10,15) have often described them by the generic term of "grain interior strain localizations". Evidently, a more detailed understanding on the development of such strain localizations is needed-which is the objective of the present study.…”

Section: Introductionmentioning

confidence: 99%

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Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

2001

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Development of dislocation substructures was characterized in an aluminum killed deep drawing quality steel at four different plane strain deformations. At and above 20 % reduction, the most significant substructural feature was micro bands (MBs). MBs appeared as paired dislocation walls of 0.2-0.4 mm thickness and were always at an angle of approximately 37°with rolling direction (RD). As the traces of the MBs were more than 5°of {110} and {112}, closed packed planes of the bcc system,-they were termed as first generation 1) or non-crystallographic using the convention 16) commonly used in fcc metals. Other than the pre-deformation high angle boundaries, MBs were the only feature with large enough misorientations necessary for optical visibility. At least for the range of strain and strain path used in the present study, the first generation MBs can be considered as the so-called grain interior strain localizations. Relative presence and effectiveness of MBs were quantified in different microtexture components from the MB spacings along TD (l) and the average misorientation across MBs (q MB ) and these appear to determine the stored energies of different microtexture components.KEY WORDS: dislocation substructure; deep drawing quality steels; grain interior strain localizations; micro band; stored energy. Table 1. Chemical composition (in wt%) of aluminum killed DDQ steel used in the present study.

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Section: Resultssupporting

confidence: 83%

Section: On the Possible Nature Of The 'Grain Interiormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

2001

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“…1,[9][10][11][12][13][14][15][16][17][18] The microstructure of the hot rolled plate, typically contains large and small grains and 'considerable' second phase particles. 1,3,4) The general understanding is that the large grains are formed by deformation and recrystallization of the ferritic grains, while the smaller grains are formed by transformation from austenite to ferrite.…”

Section: Introductionmentioning

confidence: 99%

“…3(b) and 4(b), the bands were typically marked by grain boundaries, often high angle -especially above 25 % reduction, mostly with a spatial orientation of 37Ϯ6°with RD. The so-called 20°b ands 10,11) were only occasionally observed in samples with 60 % and 77 % reduction, mostly as part of a deformed grain or a grain edge appearing at such an angle. The appearance of the 37°bands seems to be related to the Taylor factor, as they did not form on grains with a Taylor factor of less than 3, see Fig.…”

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Development of Cold Rolled Texture and Microstructure in a Hot Band Fe-3%Si Steel.

et al. 2002

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Hot band Fe-3%Si steel (CRGO or cold rolled grain oriented) was cold rolled with different reductions. The main objective of this study was an overall understanding of deformation texture and microstructure development. Hot band CRGO had a strong a-fiber (RD//͗110͘) texture. Cold reduction strengthened the a and g (ND//͗111͘) fibers, but weakened q (ND//͗100͘). All Taylor type deformation texture models were reasonably successful in predicting these bulk texture developments, and the Lamel model seems to be the 'best-fit' model, both in terms of a 'deviation' parameter (indicating differences between experimental and simulated values of idealized texture components) and a 'trend' parameter (indicating the relative change(s) in texture components with strain). The striking feature of the microstructure was the 'selective' appearance of grain interior strain localization's. These appeared at approximately 37°with the rolling direction (RD). Though 37°bands appeared only in orientations with high Taylor factor (M ), the absolute value of the Taylor factor alone, was not enough for the appearance of such bands. Negative textural softening or (dM/de) values, on the other hand, were always associated with the appearance of 37°bands, justifying or explaining their formation on the basis of a macroscopic plastic instability theory.KEY WORDS: cold rolling; texture; grain oriented electrical steel; microstructure; strain localizations.* 1 However excellent review articles on CRGO are perhaps limited, 4) as compared to forming grade steels. [23][24][25][26] a previous study of the present authors, it was suggested that the relative presence of the respective strain localization's may determine the frequency and 'perfection' of the primary recrystallized Goss grains, perhaps determining the effectiveness of the subsequent secondary recrystallization process. 11) A recent study in low carbon steel 34) has indicated that at least the 37°strain localization's are first generation micro bands forming on the so-called 'high Taylor Factor' orientations. How such strain localization's may evolve in a cold-deformed CRGO and if both 37°and 20°b ands are of the same nature and origin remains to be explored. Experimental MethodsA 200 kg Fe-3%Si steel ingot was hot rolled from 50 to 2.1 mm thickness (pre-heating temperature being 1 330°C). The chemical composition of the hot rolled strip is given in Table 1. The hot rolled strip was annealed at 1 000°C for 60 s and then quenched. The annealed hot-band material was subsequently cold rolled with a laboratory mill to 5 different reductions -25 %, 40 %, 60 %, 77 % and 88 %. Samples were obtained for all these conditions for bulk texture and OIM (Orientation Imaging Microscopy) measurements, using respectively the mid-thickness sections of the rolling plane (containing rolling and transverse directions, i.e. RD and TD) and the long transverse plane (containing rolling and normal directions, i.e. RD and ND).Bulk texture measurements were analyzed by inversion of 4 incomplete pole figures a...

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On Goss Orientation in Strip Cast Grain‐Oriented Silicon Steel

Fang

Zhang

et al. 2018

steel research int.

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In this study, the origin of Goss texture during intermediate annealing and Goss texture development during secondary annealing of strip cast grainoriented silicon steel are studied by electron backscattered diffraction (EBSD). The study indicates that Goss grains originate inside the shear bands of deformed {111}<112> and {111}<110> grains. Compared to {111}<110> grains, {111}<112> grains provide more number of nucleation sites for Goss grains. During subsequent recrystallization process, Goss grains exhibit a smaller growth rate than the average value of all the recrystallized grains. The development mechanism of Goss texture is concluded as oriented nucleation. Prior to secondary annealing, high fraction of high-energy boundaries (20 -45 misorientation angle) are observed in the vicinity of Goss grains, while significantly low fraction of Σ5 þ Σ7 þ Σ9 boundaries are observed. During secondary annealing, the domination of high energy boundaries around Goss grains is maintained, but the fraction of Σ5 þ Σ7 þ Σ9 boundaries decrease to be similar to the matrix grains. After the onset of the abnormal grain growth, the growing Goss grains continue to consist of high fraction of high-energy boundaries. These results are consistent with the high energy (HE) boundary model, which is used to explain the abnormal grain growth in the current strip casting route.

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Primary recrystallization in a grain oriented silicon steel: on the origin of goss {110}<001> grains

Cited by 44 publications

References 13 publications

Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

Development of Cold Rolled Texture and Microstructure in a Hot Band Fe-3%Si Steel.

On Goss Orientation in Strip Cast Grain‐Oriented Silicon Steel

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