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Evaluating a new core-sheath procedure for processing hard metals by equal-channel angular pressing

Evaluating a new core-sheath procedure for processing hard metals by equal-channel angular pressing
Evaluating a new core-sheath procedure for processing hard metals by equal-channel angular pressing
A new design of billet, based on a core–sheath configuration, was used for the processing of Ni, Fe, and a NiTi alloy by equal-channel angular pressing (ECAP) at room temperature. This configuration involves inserting metal cores within Fe sheaths prior to processing and it is designed especially for use with hard-to-deform materials. Billets were processed through one or two ECAP passes at room temperature and the microhardness values were recorded across the transverse directions within the cores to evaluate the flow process. As in conventional ECAP, the hardness increased significantly after the first pass and there were regions of lower hardness along the bottom surfaces of each core. The gradient of hardness decreased with increasing core diameter but the average microhardness values remained unchanged. Three-dimensional finite element simulations were used to evaluate the flow behavior after one pass of ECAP using different core metals. These simulations show the lower areas of the cores undergo less deformation than the upper areas and the homogeneity increases with increasing levels of friction at the core–sheath interface
1438-1656
918-926
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Mansouri-Arani, Mojtaba
11fcd10a-d206-4e25-bc56-efc90a14034f
Khajezade, Ali
3749be39-fcd7-473f-9e7d-e1f607e39469
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Mansouri-Arani, Mojtaba
11fcd10a-d206-4e25-bc56-efc90a14034f
Khajezade, Ali
3749be39-fcd7-473f-9e7d-e1f607e39469
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Shahmir, Hamed, Nili-Ahmadabadi, Mahmoud, Mansouri-Arani, Mojtaba, Khajezade, Ali and Langdon, Terence G. (2014) Evaluating a new core-sheath procedure for processing hard metals by equal-channel angular pressing. Advanced Engineering Materials, 16 (7), 918-926. (doi:10.1002/adem.201300474).

Record type: Article

Abstract

A new design of billet, based on a core–sheath configuration, was used for the processing of Ni, Fe, and a NiTi alloy by equal-channel angular pressing (ECAP) at room temperature. This configuration involves inserting metal cores within Fe sheaths prior to processing and it is designed especially for use with hard-to-deform materials. Billets were processed through one or two ECAP passes at room temperature and the microhardness values were recorded across the transverse directions within the cores to evaluate the flow process. As in conventional ECAP, the hardness increased significantly after the first pass and there were regions of lower hardness along the bottom surfaces of each core. The gradient of hardness decreased with increasing core diameter but the average microhardness values remained unchanged. Three-dimensional finite element simulations were used to evaluate the flow behavior after one pass of ECAP using different core metals. These simulations show the lower areas of the cores undergo less deformation than the upper areas and the homogeneity increases with increasing levels of friction at the core–sheath interface

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More information

e-pub ahead of print date: 22 January 2014
Published date: July 2014
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 368091
URI: http://eprints.soton.ac.uk/id/eprint/368091
ISSN: 1438-1656
PURE UUID: f9072fba-3244-4555-8314-884c7a8ea95c
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 12 Sep 2014 09:34
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Hamed Shahmir
Author: Mahmoud Nili-Ahmadabadi
Author: Mojtaba Mansouri-Arani
Author: Ali Khajezade

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