A novel combined severe plastic deformation method for producing thin-walled ultrafine grained cylindrical tubes

Abdolvand, H.; Sohrabi, Hadi; Faraji, Ghader; Yusof, Farazila

doi:10.1016/j.matlet.2014.12.107

Cited by 42 publications

(21 citation statements)

References 17 publications

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“…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.…”

Section: Severe Plastic Deformation Processesmentioning

confidence: 99%

Decade of Twist Channel Angular Pressing: A Review

Macháčková

2020

Materials

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The methods of severe plastic deformation (SPD) have gained attention within the last decades primarily owing to their ability to substantially refine the grains within metallic materials and, therefore, significantly enhance the properties. Among one of the most efficient SPD methods is the equal channel angular pressing (ECAP)-based twist channel angular pressing (TCAP) method, combining channel twist and channel bending within a single die. This unique die affects the processed material with three independent strain paths during a single pass, which supports the development of substructure and efficiently refines the grains. This review is intended to summarize the characteristics of the TCAP method and its main features documented within the last decade, since its development in 2010. The article is supplemented with a brief characterization of other known SPD methods based on the combination of ECAP and twist extrusion (TE) within a single die.

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Section: Severe Plastic Deformation Processesmentioning

confidence: 99%

Decade of Twist Channel Angular Pressing: A Review

Macháčková

2020

Materials

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“…As is realized, the large amount of deformation load in pressing based processes is consumed to overcome the friction forces. 63,64) Orlov et al demonstrated the feasibility of upscaling of SPD technique by an integrated die combining conventional extrusion and ECAP as an integrated processing step. 65) As shown schematically in Fig.…”

Section: Integrated Extrusion and Equal Channel Angularmentioning

confidence: 99%

“…65) Similarly, Abdolvand et al presented a similar combined process for tubular components. 63,66) These processes may increase the efficiency of the process by increasing the length of the final sample with reduced cross section. However, the sample length at the entrance is dramatically decreased in comparison with ECAP.…”

Section: Integrated Extrusion and Equal Channel Angularmentioning

confidence: 99%

An Overview on the Continuous Severe Plastic Deformation Methods

Faraji

Torabzadeh

2019

Mater. Trans.

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Severe Plastic Deformation (SPD) processes have been extensively investigated in the last 30 years to facilitate the production processes of nanostructured (NS) or ultrafine-grained (UFG) materials with unique properties. However, the majority of the efforts were limited on the laboratory-scale investigations not to be able to overcome the demands for industrial scale applications. Researchers have tried to introduce effective industrial methods for processing large and long UFG/NG materials. In this review, all industrial processes especially continuous SPD methods which are more suitable for mass production are categorized and explained. Furthermore, the factors influencing the process efficiency were presented to give a vision to the researchers who want to step in this scientific field. Finally, the industrial processes were compared regarding final microstructure and properties.

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“…As the thickness of the tube is reduced, the friction force to process load ratio remarkably increased. Recently, a successfully combined SPD process was proposed to solve the mentioned issue by the authors [20]. In that study, a commercial AZ31 alloy with just a single cycle of the combined process was performed.…”

Section: Introductionmentioning

confidence: 99%

“…During the TBE process, the punch moves down and presses the tube to generate thin-walled tube. The total equivalent strain achieved from N cycles of the PTCAP process and TBE process can be obtained from the following equation [20]: In the current study, the novel combined SPD process was applied to a commercial AZ91 magnesium alloy for the first time. The AZ91 alloy tubes were treated with PTCAP up to three cycles followed by TBE to demonstrate the effect of the number of passes on the mechanical properties, microstructural evolution and microhardness variations of thin-walled UFG tubes.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of fine-grained thin-walled AZ91 tubes processed by a novel combined SPD process

et al. 2017

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A combination of parallel tubular channel angular pressing (PTCAP) and tube backward extrusion (TBE) as a novel combined severe plastic deformation (SPD) was applied on AZ91 alloy to produce ultrafine-grained (UFG) thinwalled tubes. The effects of combined SPD process were investigated on the microstructure refinement and mechanical properties. Also, hydro-bulge test was carried out to reveal the mechanical properties. The results showed a notable increase in ultimate strength, yield strength and microhardness of the thin-walled UFG tube were achieved compared to that from PTCAP process. A remarkable grain refinement achieved. Applying three-passes-combined process refine the grain size to 8.8 μm from an initial value of ∼150 μm. For one pass-and two passes-processed thin-walled tubes, it was about 12.4 and 9.8 μm, respectively. Yield and ultimate strengths were increased notably to 150 and 354 MPa for 2P+TBE tube, from the initial values of 86 and 166 MPa, respectively. The maximum microhardness was increased to about 105 Hv for the 2P+TBE tube from the initial value of 56 Hv. Hydro-bulge test showed that the bursting pressure increased to 246 bar for 2 passes-thin-walled tube from the initial value of 160 bar. It was 220 and 195 bar for 1 pass-and 3 passes-thin-walled tubes, respectively.

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A novel combined severe plastic deformation method for producing thin-walled ultrafine grained cylindrical tubes

Cited by 42 publications

References 17 publications

Decade of Twist Channel Angular Pressing: A Review

Decade of Twist Channel Angular Pressing: A Review

An Overview on the Continuous Severe Plastic Deformation Methods

Microstructure and mechanical properties of fine-grained thin-walled AZ91 tubes processed by a novel combined SPD process

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