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Estimation of Average Strain Rate during Equal-Channel Angular Pressing

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Abstract:

In plastic deformation, the strain rate is a crucial factor to influence the constitutive behavior of materials such as the flow stress evolution, dislocation slipping, and deformation heat generation. In the present work, a formula based on the volume flow rate rule in plastic deformation was proposed to estimate the average strain rate of materials during equal-channel angular pressing (ECAP). It has been found that both the deformation parameters (channel angle Φ, corner angle Ψ, channel width d, and pressing speed v) and material characteristics (strain hardening behavior) can influence the average strain rate during ECAP. The present model was compared with two other models for estimating the strain rate and numerical values calculated by four different finite element methods (FEM). The result of the present model is in good agreement with the numerical strain rate values by FEM at various values for channel angle Φ and corner angle Ψ.

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Periodical:

Materials Science Forum (Volume 850)

Pages:

419-425

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.850.419

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Online since:

March 2016

Authors:

Fan Liu, Ying Liu, Jing Tao Wang

Keywords:

Average Strain Rate, Equal Channel Angular Pressing (ECAP), Severe Plastic Deformation

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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