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On the Tensile Stress and Damage Accumulation during Equal Channel Angular Extrusion

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Abstract:

The Cockcroft-Latham (CL) damage factor has been calculated, using FEM simulation, during equal channel angular extrusion (ECAE) of strain hardening materials. A high CL damage factor was predicted inside the billet and the damage was increased with the increasing strain hardening coefficient. This was closely related to a generation of increasingly high tensile stress in the deformation zone inside the billet due to an inhomogeneous deformation. The possibility of cracking inside the ECAE billets was confirmed in the ECAE processing of Ti-0.34O-0.95Fe and Ti-0.5Fe billets. The simulation further predicted that CL damage factor can be reduced by applying back pressure or friction force.

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Periodical:

Advanced Materials Research (Volumes 295-297)

Pages:

2283-2289

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.295-297.2283

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Online since:

July 2011

Authors:

Zhi Jian Zhang, Joong Kuen Park

Keywords:

Equal Channel Angular Extrusion (ECAE), Finite Element Model (FEM), Severe Plastic Deformation (SPD), Workability

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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