Effect of roll speed ratio on deformation characteristics of IF steel subjected to differential speed rolling

Ko, Young Gun; Suharto, J.; Lee, J. S.; Park, B. H.; Shin, Dong Hyuk

doi:10.1007/s12540-013-3033-7

Cited by 35 publications

(10 citation statements)

References 28 publications

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“…Moreover, a decrease of calculated standard deviation values upon raising the roll speed mismatch confirms a more homogeneous course of deformation with the presence of additional shear strain. This finding is in line with the results of previously reported works on various DSRprocessed materials (e.g., Al [32] and Cu [11] ) and may be related to a decrease in surface frictional stresses (which are cited as the main reason for the nonuniformity of deformation upon rolling [33] ) with a rise in roll speed mismatch.…”

Section: Strain Changes During Rollingsupporting

confidence: 92%

Electron Backscatter Diffraction Study on Microstructure, Texture, and Strain Evolution in Armco Iron Severely Deformed by the Differential Speed Rolling Method

Polkowski

Jóźwik

Bojar

2015

Metall Mater Trans A

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Results of the electron backscatter diffraction (EBSD) study on structural changes in Armco iron subjected to severe plastic deformation by differential speed rolling (DSR) with different values of roll speed mismatch (R = 1, 2, 3, and 4) are shown in the present article. Results of the EBSD microstructure evaluation reveal that a differentiation of roll speeds results in an effect of structure refinement-iron samples processed with high roll speed mismatch are characterized by a high fraction of grains with submicron size. A microtexture examination shows that the DSR process leads to an overall texture weakening effect and a displacement (a shifting to different ''stable'' positions) of the basic rolling texture components, due to an additional presence of a simple shear component in the deformation gradient imposed to the material. Despite the higher hardness of the DSR-processed samples, results of the EBSD strain analysis indicate that some part of the stored deformation energy is released during rolling with an additional presence of shear strain. This finding points toward the possibility of activating a dynamic transformation of the material structure into some more stable state. However, since the observed structural changes take place inside deformation bands and do not lead directly to the formation of a fully equiaxed grain structure, it seems to be more reasonable to call the observed structure transformation a subgrain structure evolution through accumulated shear deformation, which may be related to the dynamic recovery process.

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Section: Strain Changes During Rollingsupporting

confidence: 92%

Electron Backscatter Diffraction Study on Microstructure, Texture, and Strain Evolution in Armco Iron Severely Deformed by the Differential Speed Rolling Method

Polkowski

Jóźwik

Bojar

2015

Metall Mater Trans A

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show abstract

“…The assessment of deformation parameters and approximated strain introduced during the DSR was conducted according to the manner described by Ko et al [16], which is based on trigonometric relationships between a geometry of a sample and a rolling gap. However, it is worth noted that in this attempt the friction between a sample and rolls is neglected, thus calculated strain values may be underestimated.…”

Section: Methodsmentioning

confidence: 99%

Differential speed rolling of Ni3Al based intermetallic alloy—Analysis of the deformation process

2015

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“…A differential speed rolling (DSR) technique is a process in which different rotational speeds of upper and lower rolls are applied, so that the shear strain could be imposed throughout the samples due to the asymmetric deformation characteristics [5,6]. Several studies have been conducted to undertake the microstructure, mechanical properties, and texture formation of the various metallic materials fabricated via a DSR process, such as magnesium [7], aluminum [8], copper [6,9], titanium [10], and steel [5,[11][12][13]. The results of these studies showed that the intense plastic strain by DSR could lead to a significant reduction in grain size together with enhanced mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Strain and crystallographic texture evaluation of interstitial free steel cold deformed by differential speed rolling

et al. 2015

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Effect of roll speed ratio on deformation characteristics of IF steel subjected to differential speed rolling

Cited by 35 publications

References 28 publications

Electron Backscatter Diffraction Study on Microstructure, Texture, and Strain Evolution in Armco Iron Severely Deformed by the Differential Speed Rolling Method

Electron Backscatter Diffraction Study on Microstructure, Texture, and Strain Evolution in Armco Iron Severely Deformed by the Differential Speed Rolling Method

Differential speed rolling of Ni3Al based intermetallic alloy—Analysis of the deformation process

Strain and crystallographic texture evaluation of interstitial free steel cold deformed by differential speed rolling

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