Dense dislocation walls and microbands aligned with slip planes—theoretical considerations

Winther, Grethe; Jensen, D. Juul; Hansen, Niels

doi:10.1016/s1359-6454(97)00168-7

Cited by 91 publications

(49 citation statements)

References 21 publications

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“…1) The trace of a second generation or crystallographic MBs, on the other hand, falls within 5°of {111}, the closed packed plane. 1,16,17) The MBs observed in the present study were: (a) always at an angle of about 37°with RD and (b) their traces, in all cases, deviated by more than 5°of {110} and {112}, closed packed planes of the bcc system. These were hence termed as non-crystallographic or first generation.…”

Section: (A)supporting

confidence: 52%

“…In fcc system, a MB is typically considered as-(I) first generation or non-crystallographic and (II) second generation or crystallographic. 1,16) The non-crystallographic or the first generation MBs tend to form with a geometric orientation to the sample axis. 1,16) This geometric orientation is along the direction of maximum shear stress.…”

Section: (A)mentioning

confidence: 99%

“…1,16) The non-crystallographic or the first generation MBs tend to form with a geometric orientation to the sample axis. 1,16) This geometric orientation is along the direction of maximum shear stress. 1) The trace of a second generation or crystallographic MBs, on the other hand, falls within 5°of {111}, the closed packed plane.…”

Section: (A)mentioning

confidence: 99%

“…1,[16][17][18][19][20][21] The usually acknowledged 1) sequence of substructure development, i.e. as a function of increasing cold reduction, in a cell forming fcc metal can be generalized as: Taylor lattice (TL)ßcell blocks (CBs) and dense dislocation walls (DDWs)ßfirst and second generation micro bands (MBs)ßshear bands (SBs).…”

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: (A)supporting

confidence: 52%

Section: (A)mentioning

confidence: 99%

Section: (A)mentioning

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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“…2a). Relatively fine initial grains promoted mechanical twinning [5] and hindered the formation of a low-energy dislocation structure in the form of planar dislocation boundaries [32]. To elucidate the characteristics of the longitudinal features observed in Fig.…”

Section: Microstructure Evolutionmentioning

confidence: 96%

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Kusakin

Belyakov

Haase

et al. 2014

Materials Science and Engineering: A

113

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a b s t r a c tThe effect of cold rolling on the microstructure evolution and mechanical properties of Fe-23Mn-0.3C-1.5Al twinning-induced plasticity (TWIP) steel was studied. The extensive mechanical twinning subdivides the initial grains into nanoscale twin lamellas. In addition, the formation of deformation micro bands at ε440% induces the formation of nanostructured bands of localized shear. It is demonstrated that the mechanical twinning is notably important for dislocation storage within the matrix, as the twin boundaries act as equally effective obstacles to dislocation glide as conventional high-angle grain boundaries. However, the contribution of the grain size strengthening to the overall yield stress (YS) is much smaller than that of the deformation strengthening, which plays a major role in the superior work-hardening behavior of TWIP steels. A very high dislocation density of $ 2 Â 10 15 m À 2 is achieved after plastic deformation with moderate strains. The superposition of deformation strengthening and grain boundary strengthening leads to an increase in the YS from 235 MPa in the initial state to 1400 MPa after 80% rolling.

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Boundary characteristics in Heavily Deformed Metals

Winther

Huang

2003

Adv Eng Mater

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The potential of creating nanostructured metals by plastic deformation to very high strains is currently the subject of intensive research. An important part of this research concerns evolution of the characteristics of deformation induced boundaries, in particular boundary spacing and boundary misorientation. The aim of this paper is to give an overview of the present understanding of the relations between these characteristics, the microscopic deformation mechanisms and the macroscopic deformation mode.

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Dense dislocation walls and microbands aligned with slip planes—theoretical considerations

Cited by 91 publications

References 21 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.

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Boundary characteristics in Heavily Deformed Metals

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