Finite element modeling and experimental validation of CGP classical and new cross routes for severe plastic deformation of an Al-Mg alloy

Moradpour, M.; Khodabakhshi, F.; Mohebpour, Saeed Reza; Eskandari, H.; Haghshenas, M.

doi:10.1016/j.jmapro.2018.12.009

Cited by 20 publications

(12 citation statements)

References 48 publications

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“…By considering the uncertainty in the normal contour method, equation ( 1) is rewritten as relation (7). In this relation,…”

Section: Fundamentals Of Uncertainty Calculation For Multi-cut Contour Methodsmentioning

confidence: 99%

“…8 CGP technique was first developed by Shin et al 9 in 2002 and many studies have been conducted on it. 6,7,[10][11][12][13][14][15][16][17] The principle of the CGP process is to create severe plastic deformation based on repetitive pressing of the sheet under the two sets of symmetrically grooved and flat dies. 18 A single pass of the CGP process includes four steps, the sequence of which is illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…2 Among the various form of materials, sheet metals are one of the most highly consumed materials with plenty of applications in different industries such as automotive, transportation, and aerospace industries. Equal-channel angular rolling (ECAR), 3 repetitive corrugation–straightening (RCS), 4 non-equal-channel angular pressing (NECAP), 5 and constrained groove pressing (CGP) 6,7 methods are the forming processes that can fabricate UFG sheet metals by exerting severe plastic deformation (SPD). In these methods, CGP, due to its ease of usage, has a positive potential for commercial applications.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the uncertainty of multi-cut contour method and friction coefficient on residual stresses of constrained groove pressing process

Nazari

Honarpisheh

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Constrained groove pressing (CGP) process is a severe plastic deformation (SPD) method that can create ultrafine-grained microstructure in the sheet metals. In this study, residual stresses of the CGP process and the effect of the friction coefficient on the residual stresses were investigated. The residual stresses were measured in two directions using a multi-cut contour method and a mathematical-finite element model was developed to estimate the uncertainty of results of the multi-cut contour method. In order to study the effect of the friction coefficient on the residual stresses, a 3D finite element model was employed and the results of it were validated with the experimental results of the CGP process. According to the results, residual stresses in the first pass of CGP are compressive on the surface and gradually change to tension at the center of the thickness. Investigation of the effect of the first cut on the residual stresses and uncertainty of the second cutting plane showed that the effect of the first cut is only confined to regions near the intersection of the two cuts. Distancing from the intersection of two cuts causes the effect of the first cut to be ineffective on the second cut. Also, evaluation of the effect of friction coefficient on the residual stress illustrated that friction has a direct relationship with the residual stresses.

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“…By considering the uncertainty in the normal contour method, equation ( 1) is rewritten as relation (7). In this relation,…”

Section: Fundamentals Of Uncertainty Calculation For Multi-cut Contour Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of the uncertainty of multi-cut contour method and friction coefficient on residual stresses of constrained groove pressing process

Nazari

Honarpisheh

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…This is due to the intersecting shear patterns of successive transitions favoring the formation of fine subgrains within the shear band [ 9 , 25 ]. Additionally, in the processing of flat elements, such as constrained groove pressing CGP [ 26 ] or repetitive corrugation and straightening by rolling (RCSR) [ 27 ], where, in subsequent operations the crossing strain paths create a specific reinforcement network, the UFG structure is formed, and the mechanical properties increase. As the number of passes increased, the strain increased and became more uniform despite the overall heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

Influence of Strain Route Changes on the Microstructure and Mechanical Properties of CuZn36 Alloy during Cross Channel Extrusion CCE

Łyszkowski

2022

Materials

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This study evaluates the impact of changing the deformation routes of the extrusion process in a cross-shaped die (CCE) on the structure and properties of a CuZn36 alloy (% at.). Samples with dimensions of Ø8 × 36 mm were subjected to extrusion at room temperature according to two variants: straight extrusion in the A route (2-, 4-, 8- and 12-pass) and extrusion with interoperative rotation by 90° in the BC route (2- and 4-pass). The improvement of strength properties was obtained as a result of grain fragmentation in the CCE process. Changes in the microstructure were observed using a light microscope, and mechanical properties were measured in the microhardness test and a static tensile test. The obtained results showed that the mechanical properties of the alloy depend on the number of passes and the material deformation route. This observation was related to the fragmentation of its structure and strengthening, which resulted in changes in its properties. The highest strength was characterized by the material pressed four times with the rotation of 90° (BC route), whose properties were comparable and even slightly better than the material squeezed twelve times without rotation (A route).

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“…Also, they introduced abrasion, adhesion, delamination, and oxidation as the wear mechanisms in various brass samples. Moradpour et al 8 used CGP as an SPD method to produce an Al-Mg alloy (AA 5052) with ultra-fine grains. They discussed cellular structure formation and precipitates morphology and dynamic strain aging behavior of produced sheets up to different passes to elaborate tensile property along rolling (RD) and transverse directions (TD) of the produced sheets in terms of anisotropy.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive comparison between the effect of elevated temperature constrained groove pressing on the microstructural evolutions, crystallographic texture, and mechanical properties of Al 2024 and Mg AZ91D alloys

Fereshteh-Saniee

Ghorbanhosseini

Yaghoubi

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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In the present research work, constrained groove pressing as one of the sheet's severe plastic deformation is employed at elevated temperature to investigate the influence of this technique on the microstructural evolutions and mechanical properties of 2024 aluminum and AZ91D magnesium alloy sheets. With this regard, three cycles of constrained groove pressing have been conducted on these alloys' annealed sheets. Optical microscopy and X-ray diffraction were used to discuss the microstructure and crystallographic texture evolution. Results demonstrated that the average grain size of the annealed specimens was decreased to 11 µm and 14 µm after one pass at 300°C for 2024 Al and AZ91D Mg alloys, respectively. By measuring the microhardness, it was found that the annealed sample has the highest homogeneity with the minimum inhomogeneity factor 5.80 and 1.86 for the 2024 Al and AZ91D Mg alloys, respectively. The ultimate tensile strength of the annealed sheet was respectively increased up to 21% and 7% for these alloys by performing the first constrained groove pressing pass. Also, all of the mechanical properties variations are changed based on crystallographic texture evolutions.

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Finite element modeling and experimental validation of CGP classical and new cross routes for severe plastic deformation of an Al-Mg alloy

Cited by 20 publications

References 48 publications

Effect of the uncertainty of multi-cut contour method and friction coefficient on residual stresses of constrained groove pressing process

Effect of the uncertainty of multi-cut contour method and friction coefficient on residual stresses of constrained groove pressing process

Influence of Strain Route Changes on the Microstructure and Mechanical Properties of CuZn36 Alloy during Cross Channel Extrusion CCE

A comprehensive comparison between the effect of elevated temperature constrained groove pressing on the microstructural evolutions, crystallographic texture, and mechanical properties of Al 2024 and Mg AZ91D alloys

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