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TECHNICAL PAPERS

A New Configuration for Equal Channel Angular Extrusion Dies

[+] Author and Article Information
R. Luri, J. León

Mechanical, Energetics and Materials Engineering Department, Manufacturing Engineering Section, Public University of Navarre, Campus de Arrosadia s/n, 31006 Pamplona, Spain

C. J. Luis

Mechanical, Energetics and Materials Engineering Department, Manufacturing Engineering Section, Public University of Navarre, Campus de Arrosadia s/n, 31006 Pamplona, Spaincluis.perez@unavarra.es

M. A. Sebastian

Manufacturing Engineering Section,National Distance University of Spain

J. Manuf. Sci. Eng 128(4), 860-865 (Feb 22, 2006) (6 pages) doi:10.1115/1.2194555 History: Received April 26, 2005; Revised February 22, 2006

Equal channel angular extrusion or pressing (ECAE or ECAP) is a process used in order to impart severe plastic deformations to processed materials with the aim of improving their mechanical properties by reducing the grain size. The grain size reduction leads to mechanical properties improvement. In the present study, a new die configuration is proposed for the ECAE process. The advantage of this die geometry is that it allows us to obtain higher plastic strain in each ECAE passage than traditional ECAE dies. It is important to optimize the die geometry, as the main aim of the ECAE process is to impart severe plastic deformations to the processed materials. Consequently, the higher the deformation, the better the improvement on the mechanical properties of the processed materials. In order to determine how variations on geometry affect the plastic strain of the processed materials finite element modeling (FEM) is used. Both analytical and FEM methods will allow us to affirm that by using this new die configuration it is possible to achieve higher deformation values per ECAE passage.

FIGURES IN THIS ARTICLE
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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Traditional ECAE die

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Figure 2

Inverted ECAE die

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Figure 3

Segal’s die assumption

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Figure 4

Iwahashi’s die assumption

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Figure 5

Die geometry assumption proposed by Luis (5)

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Figure 6

New die geometry proposed

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Figure 7

Enlarged view from Fig. 6, in order to obtain the relationship between R1, R2, Φ, Ψ, and ad

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Figure 8

Geometric relationship for determining the equivalent plastic strain

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Figure 9

Total equivalent plastic strain for a die that has a ϕ=90deg and a width (D) of 10mm when both the internal and the external radii vary, determined from the analytical formulas developed in the text

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Figure 10

Total equivalent plastic strain for a die that has a ϕ angle of 90deg and 10mm width (D) when both the internal and the external radii vary, determined by using the analytical formulas developed in the text

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Figure 11

(top) FEM simulation, (bottom) deformed marked grid after an ECAE passage

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Figure 12

Total equivalent plastic strain for ϕ=90deg and 10mm width (D) when the internal and the external radii vary, calculated by using FEM modeling

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Figure 13

Total equivalent plastic strain for ϕ=90deg and 10mm width (D) when the internal and the external radii vary, calculated by using FEM modeling

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Figure 14

Total equivalent plastic strain versus die width (D) for both traditional and proposed die (inverted ECAE)

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