Analysis of the billet deformation behaviour in equal channel angular extrusion

Bowen, Jacob R.; Gholinia, Ali; Roberts, S.M.; Prangnell, P.B.

doi:10.1016/s0921-5093(00)00834-0

Cited by 218 publications

(124 citation statements)

References 15 publications

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“…This type of heterogeneity is due to the non-uniform strain distribution through the billet thickness. For the same die and similar friction conditions, it was established that the applied strain was much lower in the bottom of the billet than in the center and top layers, where the applied strain was relatively uniform [3]. Therefore, the greater HAB spacing and lower fraction of HABs in the bottom are due to the lower strain in this part of the ECAE-deformed billet.…”

Section: Resultsmentioning

confidence: 93%

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EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

Mishin

Bowen

Godfrey

2012

MSF

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Abstract. The deformed microstructure and recrystallization behavior of copper samples processed using equal channel angular extrusion (ECAE) have been investigated. The heavily deformed microstructure was found to be non-uniform through the sample thickness and to vary in a manner consistent with the non-uniform distribution of strain imposed by processing. The through-thickness heterogeneity of the deformed microstructure resulted in a different extent of recrystallization in different layers during annealing. Recrystallized grains were also observed in samples that were not annealed, but stored at room temperature, which indicates that the deformed microstructure of ECAE-processed pure copper is unstable even at room temperature. In each sample, recrystallization was found to initiate in regions containing predominantly large misorientations.

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Section: Resultsmentioning

confidence: 93%

“…The heterogeneities exist both locally and on the sample scale, e.g. from the end to the middle [3] or the top to the bottom of the billet [4]. The presence of deformation-induced heterogeneities is known to affect the progress of recrystallization and therefore should be characterized thoroughly.…”

Section: Introductionmentioning

confidence: 99%

EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

Mishin

Bowen

Godfrey

2012

MSF

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“…3 was modelled as a non-deforming rigid body and was assumed to be stationary by imposing zero displacement boundary conditions. As it has been reported that the inhomogeneity of strain distribution increases with large corner angles [17,23] and the strain distribution is not significantly altered up to a corner angle of ∼ 20…”

Section: Finite Element Analysismentioning

confidence: 85%

“…Excluding the highly inhomogeneous work piece ends ∼ 20 mm on either side, the average equivalent plastic strain obtained from the analysis after each pass was compared with the values estimated using the analytical equation proposed by Iwahashi et al [23]. It can be clearly seen from Fig.…”

Section: Equivalent Plastic Strain Distributionmentioning

confidence: 99%

Deformation behaviour of pure aluminium during multi-pass equal channel angular pressing through route #C

Kumar¹,

Balasundar²,

Raghu³

2010

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Deformation behaviour of commercial pure aluminium during multiple pass equal channel angular pressing (ECAP) through route #C has been evaluated using finite element analysis. The results obtained indicate that a parallelogram shaped uniform plastic strain distribution can be obtained in the work piece. The plastic strain variation along the top, middle and bottom of the work piece along its length suggests that during multiple pass ECAP following route #C, a uniform plastic strain can be obtained in the work piece after every two passes if one can neglect the front and back end of the work piece. The length of these ends that need to be removed in ECAP processed work piece was found to be equal to the ECAP channel width (w). Further, it has been established that during multi-pass ECAP through route #C, the corner gap subtended by the work piece is independent of its geometry, whereas the load--displacement curve is dependent on the work piece geometry.K e y w o r d s : equal channel angular pressing, finite element analysis, multi-pass, route #C

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“…For better understanding of the deformation behavior numerically, Prangnell et al 7) presented a simplified finite element model neglecting the frictional effect and Bowen et al 8) studied deformation behavior of the billet under various conditions by both finite element analyses and experiments. Semiatin et al 9) investigated the effect of material properties and die geometries on deformation pattern and surface cracking by numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Investigation of Equal Channel Angular Extrusion Process

Lee

Son

2004

Mater. Trans.

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In this study, the effect of material properties on deformation pattern and strain distribution of the commercially-available pure titanium (CP-Ti) specimen during an equal channel angular extrusion (ECAE) was investigated. Finite element analyses were carried out for twodimensional plane strain condition at elevated temperatures. Material properties were assumed by hardening, softening, and no hardening behaviors based on the measured experiment data. The effects of friction conditions, die geometries, and processing routes were also examined under the same processing condition. Based on the value of average strain and standard deviation of the strain distribution, the magnitude and uniformity of deformation was determined depending on process conditions. In addition, damage parameters based on plastic work and Cockroft and Latham criteria were calculated to check the likeliness of surface cracking. Finally, non-isothermal analyses were carried out to explore the effect of processing temperature in the ECAE process.

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Analysis of the billet deformation behaviour in equal channel angular extrusion

Cited by 218 publications

References 15 publications

EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

Deformation behaviour of pure aluminium during multi-pass equal channel angular pressing through route #C

Finite Element Investigation of Equal Channel Angular Extrusion Process

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