On cells and microbands formed in an interstitial-free steel during cold rolling at low to medium reductions

Chen, Q. Z.; Duggan, B.J.

doi:10.1007/s11661-004-0178-5

Cited by 60 publications

(33 citation statements)

References 23 publications

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“…It is recognized that a microband structure is often observed under conditions of highly localized microplastic deformation and the development of nonequilibrium structures [27,28]. The elongated substructures observed around the tool pin in this study are similar to the microband structures formed in metals during cold deformation [26,27].…”

Section: Microstructure Formed Around Pin Toolsupporting

confidence: 67%

“…It is also found that, during cold deformation, a microband structure starts to appear when the strain reaches a certain value [24][25][26][27]. With increasing strain, the propensity for microbands increases and the width of microbands decreases.…”

Section: Microstructure Formed Around Pin Toolmentioning

confidence: 91%

“…It is proposed that the microbands are derived from walls of dislocations in the deformed matrix rather than by rearrangement of dislocations in the existing cell structure [26,29,30]. The microband walls are characterized by a denser dislocation arrangement than the lower-angle dislocation cell structures [31].…”

Section: Microstructure Formed Around Pin Toolmentioning

confidence: 99%

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Development of nanocrystalline structure in Cu during friction stir processing (FSP)

Nelson

McNelley

et al. 2011

Materials Science and Engineering: A

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Section: Microstructure Formed Around Pin Toolsupporting

confidence: 67%

Section: Microstructure Formed Around Pin Toolmentioning

confidence: 91%

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Development of nanocrystalline structure in Cu during friction stir processing (FSP)

Nelson

McNelley

et al. 2011

Materials Science and Engineering: A

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“…12) Concerning the crystallographic species, Chen et al conducted a detailed STEM investigation of microstructure development over the strain range 2% to ϳ50 %. 13,14) The microbands formed predominantly in grains belonging to the so-called g fibre, i.e., those whose orientation could be described as {111}//RP. The microbands are parallel walls of dislocations 0.1-0.3 mm in width lying as plate-like structures inclined at 20°to 40°in the LS.…”

Section: Introductionmentioning

confidence: 99%

Shear Band Thickening during Rolling of Interstitial Free Steel

Quadir

Duggan

2006

ISIJ Int.

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This paper shows how shear bands which are produced by slip, and are initially of the width of microbands in interstitial free (IF) steel, thicken to the order of 5-7 times the thickness of microbands. The process involves the operation of two shear bands shearing in opposite senses. The importance of this process is that it is capable of increasing the misorientation of the shear band material such that in principle, shear bands can provide nuclei for recrystallization. This reconciles the observation that sometimes shear band nucleation is observed, while in others, it does not happen.KEY WORDS: S-band; shear band; Schmid factor; IF steel; cold rolling.ISIJ International, Vol. 46 (2006), No. 10, pp. 1495No. 10, pp. -1499 ResultsOnly crystals belonging to the g fibre of the BCC rolling texture, which are heavily microbanded, are analysed in this paper. Figure 1 is a TEM micrograph from the longitudinal section (LS) showing developing instabilities in a microbanded grain. This structure has been described by the RISf group as S-bands 16) and the similarity between this micrograph and their micrographs derived from cold rolled Ni is striking. The transition from Area 1 to Area 2 is remarkable in that Area 1 shows clear curving of the microbands, but Area 2 shows narrow shear bands of about one microband in width. In other words, there seems to be a complete transition from the upper to the lower part of this single grain from early formation to mature narrow shear bands. Figure 2(a) is a magnified image of Area 1 and shows the curving of the microbands AЈ-AЉ, BЈ-BЉ and CЈ-CЉ to AЈ-A, BЈ-B and CЈ-C in the sheared region. The orientations of the sheared and un-sheared regions of the microbands were measured by Kikuchi patters obtained using TEM CBEDs, Figs. 2(b) and 2(c). The orientations of the microband AЈ-AЉ is (116, 148,120)[13,11, 1] and it is misoriented by small angle with neighboring microbands BЈ-BЉ and CЈ-CЉ. The orientation of the sheared segment A-AЈ is (16, 27,17)[4, 3, 1] and this is related to the matrix AЈ-AЉ by a 9.5°rotation. Figure 3(a) is an enlargement of Area 2 and reveals a relatively later stage of the development in the form of discrete shear bands of width 0.3 mm which now show no apparent link with the surrounding microbands, curvature unlike the S-bands of Area 1. The orientation of the shear band material is measured using the same method and is identical to the curving microbands seen in Fig. 2, but the lattice curvature is more localized. The region of intense curvature is parallel to the S-bands and the microbands surrounding them have identical orientations to the microbands surrounding the S-bands (the matrix orientation is (116, 148, 1 120)[13, 1 11, 1]). The orientation of the shear bands is (16, 30,21) [45,30,10] and this is misoriented by 9.8°with the matrix. These results support the idea that 'S-bands' are precursors to fully developed shear bands of one microband width.Shear bands having a different microstructure and of the thickness about 1-2 mm appeared in certain c...

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“…A comprehensive description of these structural species are given elsewhere by Chen and Duggan. 31) Chen et al 23) also conducted a systematic EBSD and TEM correlative study on these deformation structures and it was found that the cell boundaries only accommodate fractions of a degree in variation in orientation. In the mesh dislocation structures the orientation variations are even lower, 23) and can only be measured over significant distances (~20 μm) across grain.…”

Section: Figures 1(a)-1(f)mentioning

confidence: 99%

Grain Boundary Deformation Phenomena and Secondary Growth of Goss Grains in a Fe-3.5%Si Steel

2017

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In this investigation, a long-standing grain growth question is addressed in a Fe-3.5% Si steel. This material undergoes secondary growth of Goss oriented grains, but the underlying mechanisms of this growth remain unresolved despite extensive investigations for almost a century. In this investigation, a key question concerning this subject is resolved i.e. whether the nature of primary recrystallization grain boundaries solely determines the growth of Goss grains during secondary recrystallization. To address this issue undeformed and lightly deformed samples were subjected to recrystallization annealing under identical conditions. Although the extent of the deformation is light, such that it creates only limited modifications in the grain boundary structures, the recrystallization mechanism changes from abnormal secondary growth to conventional grain growth. In the former case, recrystallization commences at higher temperatures when the MnS inhibiting particles become dissolved, and in the latter mechanism, recrystallization occurs at lower temperatures due to the differences in stored energy between grains sharing a common boundary. This occurs through strain-induced grain boundary migration.

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On cells and microbands formed in an interstitial-free steel during cold rolling at low to medium reductions

Cited by 60 publications

References 23 publications

Development of nanocrystalline structure in Cu during friction stir processing (FSP)

Development of nanocrystalline structure in Cu during friction stir processing (FSP)

Shear Band Thickening during Rolling of Interstitial Free Steel

Grain Boundary Deformation Phenomena and Secondary Growth of Goss Grains in a Fe-3.5%Si Steel

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