Development of Severe Torsion Straining Process for Rapid Continuous Grain Refinement

Abstract

This study presents a rapid continuous process for grain refinement in metallic materials through severe plastic deformation (SPD). The principle is described and the process is applied to an Al-5056 alloy and an S45C carbon steel. The new process, designated in this study the severe torsion straining process (STSP), consists of producing a local heated zone in a rod and introducing torsion strain into the zone by rotating one end with the other. The process is continuous because the straining is achieved while the rod is moved so that the heated zone is shifted along the rod. The STSP does not require the use of any die and can be applicable to pipes or wires. Fine-grained structures produced with the STSP are confirmed using optical microscopy and transmission electron microscopy. Tensile properties are measured and compared with the unstrained fully annealed samples. The feasibility of the STSP is discussed with respect to the rotation speed and moving speed.

Nanostructured Multifilamentary Carbon‐Copper Composites: Fabrication, Microstructural Characterization, and Properties

“…The more common techniques are Equal-Channel Angular Pressing (ECAP) [4], High-Pressure Torsion (HPT) [5,6], and Accumulative Roll Bonding (ARB) [7,8]. However, several variants and combination [9] of plastic deformation techniques, including accumulative repetitive deformation [3], were also developed Accumulative Spin-Bonding (ASB) [10], Equal Channel Angular Rolling (ECAR) [11,12], Cyclic Extrusion Compression (CEC) [13], Cyclic Closed-Die Forging (CCDF) [14,15], Linear Flow Splitting (LFS) [16], Severe Torsion Straining (STS) [17], Torsion Extrusion Process (TEP) [18], Cylinder Covered Compression (CCC) [19], Asymmetric Rolling (AR) [20,21], and Accumulative Deep Wire-Drawing and bonding (WD) [22][23][24]. In this paper, we present a modified wire-drawing process.…”

Decade of Twist Channel Angular Pressing: A Review

“…Although numerous SPD processes have been introduced, not all the existing methods can be listed here owing to the continuing research in this field. However, the examples are high pressure sliding [14], high pressure tube twisting [15], friction stir processing [16], equal channel angular drawing [17], ECAP-partial back pressure [18], accumulative back extrusion [19], accumulative roll bonding [20], accumulative spin bonding [21], constrained groove pressing [22], constrained studded pressing [23], parallel tubular channel angular pressing [24], tube channel pressing [25], elliptical cross-section spiral equal-channel extrusion [26], C-shape equal channel reciprocating extrusion [27], half channel angular extrusion [28], cyclic extrusion compression [29], cyclic closed die forging [30], cyclic expansion extrusion [31], cyclic extrusion compression angular pressing [32], (variable lead) axi-symmetric forward spiral extrusion [33,34], forward shear normal extrusion [35], rotary extrusion [36], torsion extrusion (TE) [37], twist extrusion (TE) [38], simple shear extrusion [39], continuous shearing [40], continuous confined strip shearing [41], continuous frictional angular extrusion [42], repetitive corrugation straightening [43], severe torsion straining [44], and so on.…”

Ultrafine-Grained Materials Produced by Severe Plastic Deformation

“…Numerous techniques for SPD processing are now available. The major methods already established for the fabrication of UFG materials include equal-channel angular pressing (ECAP) [7][8], high-pressure torsion (HPT) [9][10], multi-directional forging [11], twist extrusion [12], cyclic-extrusion-compression [13], reciprocating extrusion [14], repetitive corrugation and straightening (RCS) [15], constrained groove pressing (CGP) [16], cylinder covered compression (CCC) [17], accumulative rollbonding (ARB) [18], friction stir processing (FSP) [19] and submerged friction stir processing (SFSP) [20], severe torsion straining (STS) [21], cyclic closed-die forging (CCDF) [22] and super short multi-pass rolling (SSMR) [23]. All of these procedures are capable of introducing large plastic straining and significant microstructure refinement in bulk crystalline solids.…”