Analysis of the micro and substructural evolution during severe plastic deformation of ARMCO iron and consequences in mechanical properties

ARMCO iron processed by ECAP up to a maximum equivalent strain of sixteen ECAP passes following route Bc was investigated by Electron Back Scattering Diffraction (EBSD), Transmission Electron Microscopy (TEM), TEM-EBSD and X-ray Diffraction Line Profile Analysis (XRDLPA). Different values of grain s...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-01, Vol.740-741, p.108-120
Main Authors: Muñoz, Jairo Alberto, Higuera, Oscar Fabián, Benito, José Antonio, Bradai, Djamel, Khelfa, Tarek, Bolmaro, Raúl E., Jorge, Alberto Moreira, Cabrera, José María
Format: Article
Language:English
Subjects:
Cast iron
Deformation mechanisms
Dislocacions en cristalls
Dislocation
Dislocation density
Dislocations in crystals
Dynamic recrystallization
Enginyeria dels materials
Ferro
Grain size
Grain size Substructure Dislocation Tensile strength Misorientation
Iron
Materials
Mechanical properties
Misorientation
Plastic deformation
Propietats mecàniques
Substructure
Tensile Strength
Transmission electron microscopy
X-ray diffraction
Àrees temàtiques de la UPC
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Summary:ARMCO iron processed by ECAP up to a maximum equivalent strain of sixteen ECAP passes following route Bc was investigated by Electron Back Scattering Diffraction (EBSD), Transmission Electron Microscopy (TEM), TEM-EBSD and X-ray Diffraction Line Profile Analysis (XRDLPA). Different values of grain size were obtained with each technique. The lower values were obtained by XRDLPA whereas, the higher values were achieved by TEM-EBSD. Dislocation densities were also calculated by different techniques obtaining values of statistically stored and geometrically necessary dislocations as a function of the deformation. All differences in values allowed a better understanding of the nature of microstructures of the materials processed by severe plastic deformation (SPD). Mechanical properties showed a considerable increment in the material strength due to the progressive reduction of the grain size because of the Continuous Dynamic Recrystallization (CDRX) mechanism and the increment in the dislocation density.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.10.100