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Dislocation study of ARMCO iron processed by ECAP

Published online by Cambridge University Press:  13 July 2016

Jairo Alberto Muñoz ,
Oscar Fabián Higuera  and
José María Cabrera
Jairo Alberto Muñoz*
Affiliation:
Department of Materials Science and Metallurgical Engineering ETSEIB, Universidad Politécnica de Catalunya, Av Diagonal 647, 08028 Barcelona, Spain.
Oscar Fabián Higuera*
Affiliation:
Department of Materials Science and Metallurgical Engineering ETSEIB, Universidad Politécnica de Catalunya, Av Diagonal 647, 08028 Barcelona, Spain. Faculty of Mechanical Engineering, Universidad del Atlántico, Colombia
José María Cabrera*
Affiliation:
Department of Materials Science and Metallurgical Engineering ETSEIB, Universidad Politécnica de Catalunya, Av Diagonal 647, 08028 Barcelona, Spain. Fundació CTM Centre Tecnológic, Pl. de la Ciencia 2, 08243, Manresa, Spain.
*
ajairo.alberto.munoz@upc.edu
bosfahico@gmail.com
cjose.maria.cabrera@upc.edu
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Abstract

The aim of this work was to study the deformation behavior of an Armco iron after severe plastic deformation by equal channel angular pressing (ECAP). Particular attention was paid to predict the dislocation density by different approaches like the model proposed by Bergström. Experimental measures of dislocation density by different techniques are used in the discussion. Cylindrical samples of ARMCO iron (8mm of diameter, 60mm of length) were subjected to ECAP deformation using a die with an intersecting channel of Φ=90° and outer arc of curvature of ψ= 37° die. Samples were deformed for up to 16 ECAP passes following route Bc. The mechanical properties of the material were measured after each pass by tensile tests. The original grain size of the annealed iron (70 μm) was drastically reduced after ECAP reaching grain sizes close to 300nm after 16 passes.

Keywords

transmission electron microscopy (TEM)dislocationsductility
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1818 , 07 July 2016 , imrc2015s4g-p003
Copyright
Copyright © Materials Research Society 2016

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References

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