Multi equal channel angular pressing with rotational dies

Kim, Y. H., Ma, Xiang, Hodgson, Peter and Barnett, Matthew 2003, Multi equal channel angular pressing with rotational dies, Materials science forum, vol. 426, no. 432, pp. 2777-2782.

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Title Multi equal channel angular pressing with rotational dies
Author(s) Kim, Y. H.
Ma, Xiang
Hodgson, Peter
Barnett, MatthewORCID iD for Barnett, Matthew orcid.org/0000-0001-8287-9044
Journal name Materials science forum
Volume number 426
Issue number 432
Start page 2777
End page 2782
Publisher Trans Tech Publications
Place of publication Zurich, Switzerland
Publication date 2003
ISSN 0255-5476
Keyword(s) rotational dies
ultra-fine grain
FEM
ECAP
upper bound method
Summary The recent successful development of the equal channel angular pressing (ECAP) process in metals provides a feasible solution to produce ultra-fine or nano-grained bulk: materials with tailored material properties. However, ECAP is difficult to scale up commercially due to excessive load requirements. In this paper, a new Multi-ECAP process with die rotation is considered to obtain ultra-fine grain structured materials under a moderate deformation force. It is shown that an addition of torsion results in a reduction in the pressing force and an increase in severity of plastic deformation. An analysis using the upper bound method is found to be useful in predicting the pressing load and flow pattern of ECAP with and without rotational dies. Solutions are obtained for different inclined channel angles under different angular velocities of dies. Relative pressures are presented and some computed solutions are compared with those found by FEM simulation. The theoretical predictions of the pressing load are in good agreement with the simulation results. The amount of plastic deformation is determined by the inclined angle between the two intersecting channels, and the velocity ratio between the angular velocity of dies and the normal component of the punch velocity.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, Trans Tech Publications
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008645

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