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Materials 2018, 11(11), 2214; https://doi.org/10.3390/ma11112214

Severe Plastic Deformation of Fe-22Al-5Cr Alloy by Cross-Channel Extrusion with Back Pressure

1
Faculty of Advanced Technology and Chemistry, Military University of Technology, 2 Urbanowicza, 00-908 Warsaw, Poland
2
Foundry Research Institute, 73 Zakopiańska, 30-418 Cracow, Poland
*
Author to whom correspondence should be addressed.
Received: 4 October 2018 / Revised: 30 October 2018 / Accepted: 2 November 2018 / Published: 8 November 2018
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Abstract

A new concept of the cross-channel extrusion (CCE) process under back pressure (BP) was proposed and tested experimentally. The obtained by finite element method (FEM) results showed that a triaxial compression occurred in the central zone, whereas the material was deformed by shearing in the outer zone. This led to the presence of a relatively uniformly deformed outer zone at 1 per pass and a strong deformation of the paraxial zone (3–5/pass). An increase in the BP did not substantially affect the accumulated strain but made it more uniform. The FEM results were verified using the physical modeling technique (PMT) by the extrusion of clay billet. The formation of the plane of the strongly flattened, and elongated grains were observed in the extrusion directions. With the increase in the number of passes, the shape of the resulting patterns expanded, indicating an increase in the deformation homogeneity. Finally, these investigations were verified experimentally for Fe-22Al-5Cr (at. %) alloy using of the purposely designed tooling. The effect of the CCE process is the fragmentation of the original material structure by dividing the primary grains. The complexity of the stress state leads to the rapid growth of microshear bands (MSB), grain defragmentation and the nucleation of new dynamically recrystallized grains about 200–400 nm size. View Full-Text
Keywords: severe plastic deformation (SPD); cross-channel extrusion (CCE); back pressure (BP); numerical simulation (FEM); physical modeling technique (PMT) severe plastic deformation (SPD); cross-channel extrusion (CCE); back pressure (BP); numerical simulation (FEM); physical modeling technique (PMT)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Łyszkowski, R.; Polkowski, W.; Czujko, T. Severe Plastic Deformation of Fe-22Al-5Cr Alloy by Cross-Channel Extrusion with Back Pressure. Materials 2018, 11, 2214.

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