Effect of deformation mode and grain orientation on misorientation development in a body-centered cubic steel

Kang, Jun; Bacroix, Brigitte; Réglé, H.; Oh, Kyu Hwan; Lee, H.-C.

doi:10.1016/j.actamat.2007.05.014

Cited by 75 publications

(34 citation statements)

References 14 publications

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“…Computed and experimental results confirmed that the average grain rotation and refinement were much more intensive for simple shear during ECAE than for pure shear during rolling. Mishra et al [34] and Kang et al [35] obtained similar results.…”

Section: Rigid Rotationsupporting

confidence: 52%

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Review: Modes and Processes of Severe Plastic Deformation

Segal¹

2018

Preprint

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In this review, severe plastic deformation (SPD) is considered as a materials processing technology. The deformation mode is the principal characteristic differentiating SPD techniques from common forming operations. For large plastic strains, deformation mode depends on the distribution of strain rates between continuum slip lines and can be varied from pure shear to simple shear. A scalar, invariant and dimensionless coefficient of deformation mode is introduced as a normalized speed of rigid rotation. On this basis, simple shear provides the optimal mode for structure modification and grain refinement whereas pure shear is "ideal" for forming operations. Special experiments and SPD practice confirm this conclusion. Various techniques of SPD are classified and described in accordance with simple shear realization or approximation. It is shown that correct analyses of the processing mechanics and technological parameters are essential for comparison of SPD techniques and the development of effective industrial technologies.

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Section: Rigid Rotationsupporting

confidence: 52%

“…In both cases the texture strengths of the UFG material were lower than those of its coarse-grained counterparts but it remained much stronger for pure shear than for simple shear. Kang et al (2007) also observed weakening of the texture strength and enhanced structure refinement due to shear deformation.…”

Section: Texturesmentioning

confidence: 87%

Review: Modes and Processes of Severe Plastic Deformation

Segal¹

2018

Preprint

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“…However, the evolution rate of the LAB fraction within one phase may depend, in a complex way, on three main parameters. The first of these is the initial LAB fraction, which is higher in the alpha phase; the second is the level of deformation, assumed to be higher in the gamma phase; and the third is the degree of stability of the subgrains created during deformation, since, owing to deformation, initially close subgrains can reorient very differently, further increasing the misorientation between them [27,28]. As a consequence of these various influences, this LAB fraction first increases faster in the gamma phase, and then still more rapidly in the alpha phase.…”

Section: Resultsmentioning

confidence: 99%

Investigation of plastic deformation heterogeneities in duplex steel by EBSD

Wroński

Tarasiuk

Bacroix

et al. 2012

Materials Characterization

101

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. A B S T R A C TAn EBSD analysis of a duplex steel (austeno-ferritic) deformed in tension up to fracture is presented. The main purpose of the paper is to describe, qualitatively and quantitatively, the differences in the behavior of the two phases during plastic deformation. In order to do so, several topological maps are measured on the deformed state using the electron backscatter diffraction technique. Distributions of grain size, misorientation, image quality factor and texture are then analyzed in detail.

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“…Thus, the mismatch between α-Fe 2 O 3 and Fe 3 O 4 are often considered to be responsible for various peculiar features of plastic flow [46]. However, previous study [29,44] reveals that intragranular plastic strain heterogeneity have revealed plastic strains as large as 5 times the macroscopic tensile strain. Large local strains were found to be statistically linked to proximity to grain boundaries.…”

Section: Discussionmentioning

confidence: 99%

“…The tolerance value for the judgment of grain interior is generally equal to 5°. Generally, the predetermined tolerance angle is between 3 and 12.5° [29]. The tolerance angle of 5° here was chosen in order to avoid the overlapping of the grain groups in this case, which could be derived from the propagation of some cracks beyond the initiating grains [30].…”

Section: Analytical Proceduresmentioning

confidence: 99%

Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD

Jiang

Zhao

et al. 2015

Surface and Coatings Technology

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Q. (2015). Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD. Surface and Coatings Technology, Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD AbstractThis work presents a fine microstructure and local misorientation study of various oxide phases in the tertiary oxide scale formed on a hot-rolled steel strip via electron back-scattering diffraction (EBSD). Local strain in individual grains of four phases, ferrite (α-Fe), wustite (FeO), magnetite (Fe 3 O 4 ) and hematite (α-Fe 2 O 3 ), has been systematically analysed. The results reveal that Fe 3 O 4 has a lower local strain than α-Fe 2 O 3 , in particular, on the surface and inner layers of the oxide scale. The multiphase oxides along the cracking or α-Fe 2 O 3 penetration generally develop a high local misorientation. Localised stain along the cracks demonstrates that the misorientation tends to be strong near grain boundaries. The high fraction of small Fe 3 O 4 grains accumulate at the oxide-substrate interface, which leads to a dramatic increase in the intensity of local stain. This variation is due mainly to the phase transformation among the oxide phases, i.e., the Fe 3 O 4 particles during their nucleation and growth. The combined action of stress relief and re-oxidisation is proposed to explain the formation of Fe 3 O 4 seam at the oxide-steel interface. The present study offers an intriguing insight into the deformation behaviour of the tertiary oxide scale formed on steels, and may help with understanding the stress-aided oxidation effect of metal alloys. offers an intriguing insight into the deformation behaviour of the tertiary oxide scale formed on steels, and may help with understanding the stress-aided oxidation effect of metal alloys.

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Effect of deformation mode and grain orientation on misorientation development in a body-centered cubic steel

Cited by 75 publications

References 14 publications

Review: Modes and Processes of Severe Plastic Deformation

Review: Modes and Processes of Severe Plastic Deformation

Investigation of plastic deformation heterogeneities in duplex steel by EBSD

Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD

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