Physical modeling of equal channel angular pressing using plasticine

Manna, R.; Agrawal, Pulkit; Joshi, Sushant; Mudda, Basavakumar K.; Mukhopadhyay, N. K.; Sastry, G. V. S.

doi:10.1016/j.scriptamat.2005.08.031

Cited by 18 publications

(18 citation statements)

References 12 publications

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“…The details of die shape are explained elsewhere. [21] The die used for ECAP consists of two channels of equal cross section intersecting at an angle of 90 deg. The friction between the billet and die was minimized by using MoS 2 lubricant on the billet and die surfaces.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the leading end becomes the trailing end between subsequent passes. [21] However, the billet orientation with respect to die is not changed during subsequent passes (this is referred to as process A).…”

Section: Methodsmentioning

confidence: 99%

“…Limited work is available on physical modeling. [16][17][18][19][20][21] Wu and Backer [16] used the plasticine model to demonstrate that strain and inclination angle of the plasticine layers obtained in the center of the billets match reasonably well within theoretical values. In contrast, experimental microstructures away from the center are considerably different due to frictional effect.…”

Section: Introductionmentioning

confidence: 95%

“…An empty dead zone in the outer corner of the die is one of the reasons attributed to the nonuniform deformation in the part, which passes through the outer corner of the die. Manna et al [21] reported in a plasticine model that, at an intermediate number of passes, though material accumulations take place in certain regions of the work piece, thorough mixing takes place after a sufficient number of passes. There is strain variation across the thickness in the Y plane.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Equal Channel Angular Pressing on Microstructure and Mechanical Properties of Commercial Purity Aluminum

Manna

Mukhopadhyay

Sastry

2007

Metall Mater Trans A

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Commercial purity aluminum was deformed by equal channel angular pressing (ECAP) using steel dies producing two different shear strains of either 1.15 or 0.60 in each pass. Two sets of samples were selected for study, of which the first set consists of aluminum billets repeatedly deformed without changing orientation (process A) up to three passes using first die. The second set of samples was equal channel angular pressed (ECAPed) using the second die up to 10 passes adopting process B c , where samples were rotated by 90 deg between successive passes. The flow patterns were revealed by optical metallography. Tensile strength and hardness were measured. The ECAPed samples were isochronally-annealed and recrystallization behavior was studied by microscopy and Vickers hardness measurements. Refinement of grain size, substructure, and texture was studied by transmission electron microscopy (TEM) and orientation imaging microscopy (OIM). The results show that flow patterns are complex and distinct from simple shear. Strain is higher at the outer surfaces, highest at the bottom surface, and intermediate in the middle of the billet. The work piece strain hardens significantly in first pass with an attendant drop in ductility. The degree of strengthening reduces in subsequent passes. The high defect density introduced during the initial passes leads to grain refinement to an ultrafine level and advantageously the material regains ductility. The refinement in microstructure obtained after two to three passes is stable up to 250°C. The flow patterns are very similar to those obtained by physical modeling in our earlier studies using plasticine. Equiaxed ultrafine-grained structure (average grain size = 0.53 lm) was obtained after ECAP at an equivalent shear strain of 6.0.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Equal Channel Angular Pressing on Microstructure and Mechanical Properties of Commercial Purity Aluminum

Manna

Mukhopadhyay

Sastry

2007

Metall Mater Trans A

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“…Despite the simple design of ECAE tool, the homogeneity of material flow, needed pressure and resulting strains are strongly influenced by a number of process parameters like tool geometry, external friction, rheology of extruded material etc. Therefore the mechanics of ECAE attracts attention of many researchers and was investigated by both theoretical and experimental means [5][6][7][8][9] . The theoretical contributions have been focused on application of the Slip Line Theory 10 , Upper Bound Analysis 5,11-13 , Finite Difference Analysis and Finite Element Modeling 6,14,15 .…”

Section: Introductionmentioning

confidence: 99%

Analysis of equal channel angular extrusion by upper bound method and rigid blocks model

2013

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In present paper the Equal Channel Angular Extrusion (ECAE) through a rectangular die was firstly physically simulated using plasticine and then theoretically analyzed by upper bound method. Physical simulation was used to identify the deformation zone and as a background for the following theoretical ECAE analysis by rigid block model. The plane strain deformation mode and ideal plasticity of an extruded material were assumed. The dependencies of ECAE pressure, accumulated shear and dimension of a "dead zone" upon friction factor were analytically determined. The rise in ECAE pressure, accumulated shear and size of a "dead zone" with the increase in friction was predicted. The obtained results were compared with the slip line based solution and a good agreement between them was found. Finally the results of upper bound analysis were discussed together with the results of experimental investigations and finite element analysis of ECAE mechanics published elsewhere.

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Effect of Flash Annealing on Ultra-Fine Grained Low-Carbon Steel Processed Through Equal-Channel Angular Pressing Followed by Cryorolling

Singh

Mukhopadhyay

Sastry

et al. 2018

Lecture Notes in Mechanical Engineering

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Physical modeling of equal channel angular pressing using plasticine

Cited by 18 publications

References 12 publications

Effect of Equal Channel Angular Pressing on Microstructure and Mechanical Properties of Commercial Purity Aluminum

Effect of Equal Channel Angular Pressing on Microstructure and Mechanical Properties of Commercial Purity Aluminum

Analysis of equal channel angular extrusion by upper bound method and rigid blocks model

Effect of Flash Annealing on Ultra-Fine Grained Low-Carbon Steel Processed Through Equal-Channel Angular Pressing Followed by Cryorolling

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