The role of coincident site lattice boundaries during selective growth in interstitial-free steels

Gangli, P.; Kestens, Léo; Jonas, John J.

doi:10.1007/bf02651872

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…The particular nuclei exhibiting CSL boundaries will not inherit their orientation from the deformed neighboring grains (termed as orientation selectivity) [ 23 ], which would be beneficial to add more variety in terms of orientation other than the orientation of the deformed grains. In addition, CSL boundaries with rotation axes parallel to especially the

axis and

axis were favorable for the growth of nuclei [ 24 , 25 ]. Moreover, in the case of Σ7, the growth was expected to be rapid and contributed significantly to final recrystallization textures via the selective growth mechanism [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Reduction Sequence during Rolling on Deformed Texture and Anisotropy of Ferritic Stainless Steel

et al. 2023

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This investigation studied the effect of reduction sequence during rolling of ferritic stainless steel on texture and anisotropy. A series of thermomechanical processes were performed on the present samples utilizing rolling deformation, with a total height reduction of 83% but with different reduction sequences, 67% + 50% (route A) and 50% + 67% (route B). Microstructural analysis showed that no significant difference was found in terms of the grain morphology between route A and route B. In terms of the texture, as compared to route A, route B developed a sharper texture on all components along the γ-fiber and a considerably higher fraction of boundaries that displayed 38°111 misorientations with respect to the surrounding deformed grains. In consequence, optimal deep drawing properties were achieved, where rm was maximized and Δr was minimized. Moreover, despite the similar morphology between the two processes, the resistance toward ridging was improved in the case of route B. This was explained in relation to the selective growth-controlled recrystallization, which favors the formation of microstructure with homogeneous distribution of the <111>//ND orientation.

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Section: Resultsmentioning

confidence: 99%

Effect of Reduction Sequence during Rolling on Deformed Texture and Anisotropy of Ferritic Stainless Steel

et al. 2023

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“…While oriented nucleation dominates the formation of many recrystallization textures [1][2][3][4][5], some are substantially modified by selective growth [2,[6][7][8]. Experiments have shown that boundaries with certain misorientations, such as 27°<110> in Fe-Si [9,10] and 40°<111> in Al [11,12] are more mobile than other boundaries, giving rise to selective growth.…”

Section: Introductionmentioning

confidence: 99%

On the Production of Randomly-Oriented Recrystallization Nuclei for Selective Growth Experiments

Nave

Verbeken

Kestens

2004

MSF

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The ideal starting condition for selective growth experiments is one having a layer of randomly-oriented nuclei adjacent to a matrix with negligible orientational variation but sufficient stored energy to promote growth. In practice, cutting or deformation processes are used in an attempt to approximate these ideal conditions, but the degree to which this is achieved has not been rigorously quantified. In this work, Fe-3wt%Si single crystals were cut or deformed using six different processes. The variation in texture with distance from the cut or deformed surface was measured using electron backscatter diffraction (EBSD) in a field emission gun scanning electron microscope (FEG-SEM) in order to assess the ability of each process to create conditions suitable for selective growth experiments. While grooving with a machine tool produced the best spread of orientations at the cut surface, the suitability of this process is diminished by the presence of a differently-textured deformed layer between the cut surface and the single crystal matrix. Grinding produced a less ideal distribution of orientations at the cut surface, but the presence of these orientations in a very thin layer adjacent to the matrix makes this process preferable for preparing crystals for selective growth experiments, provided the results are corrected for the deviation in the distribution of nuclei orientations from a random distribution.

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“…It is comparable to textures reported in the literature for cold-rolled IF steels of relatively similar composition and rolling reduction. 13,24,25) The density along the RDfibre increases steadily from 6 at Fϭ0°, ͕001͖͗110͘, to a peak of 10 at Fϭ30°, half-way between ͕113͖͗110͘ and ͕112͖͗110͘. Beyond Fϭ45°, the density decreases rapidly, dropping below 1 at Fϭ70°.…”

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confidence: 99%

Fragmentation of Orientation within Grains of a Cold-rolled Interstitial-free Steel

Nave

Barnett

2004

ISIJ International

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The formation of a favourable recrystallization texture in interstitial-free (IF) steels depends on the availability and activation of particular nucleation sites in the deformed microstructure. This paper presents a description of the deformed microstructure of a commercially cold-rolled IF steel, with particular emphasis on the microstructural inhomogeneities and short-range orientational variation that provide suitable nucleation sites during recrystallization. RD-fibre regions deform relatively homogeneously and exhibit little short-range orientational variation. ND-fibre regions are heavily banded and exhibit considerable short-range orientational variation associated with the bands. While the overall orientational spread of ND-fibre grains frequently is about the ND-axis, the short-range orientational variation often involves rotation about axes in the TD-ND plane that are nearer to the TD than the ND.KEY WORDS: steel; IF steel; cold rolling; texture; misorientation; electron backscatter diffraction; EBSD; shear bands.scope (FEG-SEM) were used to investigate the microstructural and orientational fragmentation of grains in a commercially cold-rolled (75 % reduction) titanium-stabilized interstitial-free steel. The composition of the steel is listed in Table 1. The steel was prepared by standard metallographic techniques and the final polishing step was with colloidal silica. Both EBSD mapping and forescatter imaging were conducted using the same microscope settings: an accelerating voltage of 20 kV and a 60 mm aperture. The specimen was positioned at a working distance of 25 mm and at a tilt of 70°. An EBSD map covering a 360ϫ360 mm area (1 200ϫ1 200 pixel array, 0.3 mm pixel spacing) was taken on each of the RD-ND and RD-TD sections. Forescatter images were taken of selected regions within the areas covered by the EBSD maps.In order to save space when describing the microstructural and orientational characteristics of grains having various orientations (and for convenience of labelling on figures) the nomenclature adopted by Samajdar et al. 3) is used. The classification scheme is shown in Table 2. Letters represent the main texture components occurring in cold-rolled steel (H, I, E, F) as well as a minor component of interest (designated J in this paper). It may be noted that there is some overlap between the I and E classes, since an orientation was considered to belong to a particular orientation class if it was within 15°of the ideal orientation corresponding to that class. A grain or region was considered to belong to a particular orientation class if the majority of orientations within it belonged to that class. However, when selecting grains or regions belonging to each class for further analysis, preference was given to grains or regions in which a high proportion of orientations were quite close to the ideal orientation for that class. While using this method carries some risk of favouring grains or regions having a lower overall orientational spread, it was felt that this effect was likely to b...

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The role of coincident site lattice boundaries during selective growth in interstitial-free steels

Cited by 7 publications

References 8 publications

Effect of Reduction Sequence during Rolling on Deformed Texture and Anisotropy of Ferritic Stainless Steel

Effect of Reduction Sequence during Rolling on Deformed Texture and Anisotropy of Ferritic Stainless Steel

On the Production of Randomly-Oriented Recrystallization Nuclei for Selective Growth Experiments

Fragmentation of Orientation within Grains of a Cold-rolled Interstitial-free Steel

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