Severe plastic deformation of metals by high-pressure tube twisting

Tóth, L.S.; Arzaghi, Mandana; Fundenberger, Jean-Jacques; Beausir, Benoît; Bouaziz, Olivier; Arruffat-Massion, Roxane

doi:10.1016/j.scriptamat.2008.09.029

Cited by 165 publications

(69 citation statements)

References 2 publications

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“…For the latter case, a simplified scheme is shown in Fig.13c. Several modifications were also introduced to expand HPT to more complex shapes having a small thickness but large dimensions in other directions: a) Toth et al [55] introduced high-pressure tube twisting (HPTT) (Fig. 14a) in which sample 1 is compressed by punches 2 and 3 between die 4 and mandrel 5 and then it is twisted by rotating die 4.…”

Section: High-pressure Torsion Of Long Samplesmentioning

confidence: 99%

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: High-pressure Torsion Of Long Samplesmentioning

confidence: 99%

Review: Modes and Processes of Severe Plastic Deformation

Segal¹

2018

Preprint

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“…614) Based on the main deformation mode, the SPD processes can be divided into several groups: (i) simple shear: equal channel angular pressing 69) and continuous confined strip shearing; 10) (ii) torsion shear: high-pressure torsion, 11,12) twist extrusion, 13) high-pressure tube twisting, 14) and conecone method; 15) and (iii) compression: accumulative rollbonding 16) and multi-directional forging. 17) Along with other torsion-based SPD processes, twist extrusion (TE) recently received some interest, which is illustrated by the emergence of new techniques based on the idea of TE.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Two Twist-Based SPD Processes: Elliptical Cross-Section Spiral Equal-Channel Extrusion vs. Twist Extrusion

2013

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The present paper deals with numerical comparison of two twist-based severe plastic deformation processes: (i) the elliptical cross-section spiral equal-channel extrusion (ECSEE) proposed recently as a novel process and (ii) the classical twist extrusion (TE). ECSEE was developed in attempt to process cylindrical work pieces and to generate more uniform strain distribution compared to classical TE. However, the present finite element simulations showed that twist zones used in both methods impose identical stress and strain states. Furthermore, the ability of ECSEE to treat cylindrical billets is achieved at the expense of the possibility to perform multi-pass extrusion through the twist zone and it requires higher loads for the overall process of extrusion.

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“…Another process to fabricate UFG tube is the high pressure tube twisting technique. In HPTT method generated by Toth et al [16], tube formed sample is positioned inside a rigid disk. A mandrel is located inside the tube, which is elastically compressed in the axial direction, and so, it expands gradually in the radial direction.…”

Section: Introductionmentioning

confidence: 99%

“…This hydrostatic stress provides a large friction force on both sides of the tube. Finally, high level plastic strain tube is obtained by rotating the rigid disk with an external torque while keeping the mandrel fixed [16,17]. The schematic representation of this technique is illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%