Analysis of strain uniformity during multi-pressing in equal channel angular extrusion

Kim, W.J.; Namgung, J.C.; Kim, J.K.

doi:10.1016/j.scriptamat.2005.04.014

Cited by 22 publications

(16 citation statements)

References 19 publications

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“…Finite element analyses 15–17 and experiments 18,19 have shown that the deformation during ECAP is not homogeneous. This non-homogeneity is mainly due to external conditions such as die geometries, processing route (route B C is the best route for achieving homogeneous properties; on the contrary, using route A would result in highest inhomogeneity among different processing routes (routes A, B C , B A , and C)), and friction as well as internal conditions such as work hardening and strain rate sensitivity of the material.…”

Section: Introductionmentioning

confidence: 99%

Effect of copper tube casing on strain distribution and mechanical properties of Al-7075 alloy processed by equal channel angular pressing

Shaeri

Djavanroodi

Sedighi

et al. 2013

The Journal of Strain Analysis for Engineering Design

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Equal channel angular pressing is an effective fabrication process for obtaining ultrafine-grained materials. In the current research, the effect of copper tube casing on the effective strain and microhardness distribution of equal channel angular pressing processed Al-7075 alloy was investigated. The material was pressed up to four passes by routes A and BC. To expose the effect of copper tube casing on homogeneity of equal channel angular pressed specimens, the finite element analysis and Vickers microhardness test were performed on the cross section of the specimens. The finite element and experimental results revealed a significant improvement in homogeneity of the specimens covered with copper tube casing as compared with specimens without cover tube. Increasing the copper tube thickness leads to further improvement in homogeneity of the equal channel angular pressed specimens. Furthermore, by covering the specimens with copper tube casing, the microhardness and strength of the equal channel angular pressed specimens increase slightly.

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Section: Introductionmentioning

confidence: 99%

Effect of copper tube casing on strain distribution and mechanical properties of Al-7075 alloy processed by equal channel angular pressing

Shaeri

Djavanroodi

Sedighi

et al. 2013

The Journal of Strain Analysis for Engineering Design

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“…Multipressing in equal channel angular extrusion was investigated by Kim et al (2005) by applying pressing steps up to four passes. In this way, a very large strain of 3-4 (i.e.…”

Section: Introductionmentioning

confidence: 99%

FEM and metallurgical analysis of modified 6082 aluminium alloys processed by multipass ECAP: Influence of material properties and different process settings on induced plastic strain

Cerri

Marco

Leo

2009

Journal of Materials Processing Technology

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“…Several reports have used FEM to analyze the distribution of strain within the billet and the influence of various die configurations and processing parameters, for example, the following: the external arc of curvature at the intersection of the channels, [10][11][12][13][14][15] the internal die angle, [12,13,[16][17][18] the role of frictional effects, [16,17,19] and the presence of a back pressure. [20][21][22] In addition, FEM was also used to analyze the distribution of strain in multiple passes of ECAP, either when an individual billet is pressed repetitively through the die [21,23] or when the billet is pressed through a die having more than one intersection of channels. [24,25] It is well established that pressing through dies with an external curvature at the intersection of the channels leads to a general inhomogeneity in the distribution of strain within the cross section of the billet.…”

Section: Introductionmentioning

confidence: 99%

Stable and Unstable Flow in Materials Processed by Equal-Channel Angular Pressing with an Emphasis on Magnesium Alloys

Figueiredo

Cetlin

Langdon

2009

Metall Mater Trans A

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Magnesium alloys such as ZK60 exhibit strain softening when processed by equal-channel angular pressing (ECAP). Finite element modeling (FEM) was used to examine the flow process during ECAP with an emphasis on the importance of the strain-rate sensitivity m. The simulations show there is unstable flow and shear localization for values of m of 0 and 0.01, but the flow is stable for values of 0.05 and 0.1. The flow softening reduces the cross-sectional area of the billet and leads to an enhanced accumulation of damage at the upper surface. The simulations show that the presence of a back pressure increases the ability of the billet to fill the exit channel but does not remove the development of plastic instabilities such as shear concentrations. It is shown that an imposed back pressure reduces the level of the maximum principal stresses in the area in which deformation takes place, and this reduces the tendency for cracking of the billet during the pressing operation.

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Analysis of strain uniformity during multi-pressing in equal channel angular extrusion

Cited by 22 publications

References 19 publications

Effect of copper tube casing on strain distribution and mechanical properties of Al-7075 alloy processed by equal channel angular pressing

Effect of copper tube casing on strain distribution and mechanical properties of Al-7075 alloy processed by equal channel angular pressing

FEM and metallurgical analysis of modified 6082 aluminium alloys processed by multipass ECAP: Influence of material properties and different process settings on induced plastic strain

Stable and Unstable Flow in Materials Processed by Equal-Channel Angular Pressing with an Emphasis on Magnesium Alloys

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