Stress and strain gradients in high-pressure tube twisting

Pougis, Arnaud; Tóth, L.S.; Bouaziz, Olivier; Fundenberger, Jean-Jacques; Barbier, David; Arruffat, R.

doi:10.1016/j.scriptamat.2012.02.004

Cited by 27 publications

(23 citation statements)

References 10 publications

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“…For comparison purposes, the stress-strain curve of a pure iron (IF steel, with a composition of 0.0018C, 0.095 Mn, 0.026 Cu, 0.023 Cr, 0.06 Al, 0.046 Ti, Fe balance, in weight percentage) in torsion testing [18] is also plotted in Figure 8. As can be seen, the strength of the compacted pure iron powder is significantly higher at any shear strain than the bulk pure iron.…”

Section: Resultsmentioning

confidence: 99%

“…The average grain size was calculated from several EBSD maps using the MCF software. [21] Figure 9 [18] IV V VI Fig. 8.…”

Section: Resultsmentioning

confidence: 99%

“…Stress-strain curve obtained from the HPT-consolidated iron sample. The strain hardening curve measured for torsion of IF steel [18] is also plotted for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…8. The strain hardening curve measured for torsion of IF steel [18] is also plotted for comparison. The strain hardening curve measured for torsion of IF steel [18] is also plotted for comparison.…”

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confidence: 99%

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Gradient Structure in High Pressure Torsion Compacted Iron Powder

et al. 2015

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Iron powder was compacted successfully into a solid disk by a severe plastic deformation processthe high pressure torsion (HPT)at room temperature. The compaction was done in two steps: first axial compaction, then shear deformation by rotating the bottom part of the HPT die while maintaining the axial force constant. The homogeneity of shear strain across the thickness of the disk was examined by local strain measurement, showing a gradient distribution. The strain gradient leads to the formation of three regions throughout the thickness of the disk: Region U, that is undeformed in torsion (top partin contact with the fixed punch), Region T, that is a transition or intermediate region where the shear strain is increasing, and Region S, which is severely deformed (bottom partin contact with the rotating die) which is uniformly and heavily sheared. The observation of microstructure and Vickers hardness in the three regions showed a non-uniform distribution, corresponding to the strain gradient. Crystallographic texture measurements confirmed the presence of a typical shear texture with increasing strength in Regions T and S. Stress-strain curve was obtained from the local shear strain and microhardness measurements. The strain hardening curve of the HPT-compacted pure iron showed higher flow stress than the torsion deformed solid pure iron (IF steel). Y. Zhao et al./Gradient Structure in High Pressure Torsion… ADVANCED ENGINEERING MATERIALS 2015, 17, No. 12

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Section: Resultsmentioning

confidence: 99%

“…The average grain size was calculated from several EBSD maps using the MCF software. [21] Figure 9 [18] IV V VI Fig. 8.…”

Section: Resultsmentioning

confidence: 99%

“…Stress-strain curve obtained from the HPT-consolidated iron sample. The strain hardening curve measured for torsion of IF steel [18] is also plotted for comparison.…”

Section: Resultsmentioning

confidence: 99%

Section: /Mpamentioning

confidence: 99%

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Gradient Structure in High Pressure Torsion Compacted Iron Powder

et al. 2015

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“…It has been found, however, that there is a gradient in the shear strain across the thin wall. 1,6) This phenomenon has been investigated experimentally 1,4,6) and was also modeled theoretically. 5,6) This point will be discussed also in the present paper and will be documented with the help of new experimental results.…”

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confidence: 99%

High Pressure Tube Twisting for Producing Ultra Fine Grained Materials: A Review

et al. 2019

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Gradient Structures in Thin‐Walled Metallic Tubes Produced by Continuous High Pressure Tube Shearing Process

Lapovok

Ng³

et al. 2017

Adv Eng Mater

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A new severe plastic deformation process, the authors refer to as High Pressure Tube Shearing (HPTS), is proposed. This type of deformation processing enhances the strength of the walls of metallic tubes by producing gradient microstructures with ultrafine grained layers in near-surface regions. The thickness of the layers associated with a gradient in microstructure can be controlled by tuning the rotational and translational speeds of the process. The paper describes several examples of steel and titanium tubes processed by different variants of HPTS. The possibility of producing gradient microstructures with ultrafine grained layers at inner or outer surface of a tube, or at both surfaces is demonstrated by in-depth theoretical analysis, finite element simulations, and experimental investigation of the microstructure and texture of tube walls.

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Stress and strain gradients in high-pressure tube twisting

Cited by 27 publications

References 10 publications

Gradient Structure in High Pressure Torsion Compacted Iron Powder

Gradient Structure in High Pressure Torsion Compacted Iron Powder

High Pressure Tube Twisting for Producing Ultra Fine Grained Materials: A Review

Gradient Structures in Thin‐Walled Metallic Tubes Produced by Continuous High Pressure Tube Shearing Process

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