Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 581, Issue -, Pages 8-15Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.05.008
Keywords
Ultrafine grained materials; High pressure torsion; Tensile behavior; Strain hardening rate; ACOM TEM
Categories
Funding
- German Research Society (Deutsche Forschungsgemeinschaft Project)
- Russian Foundation
- Karlsruhe Nano Micro Facility (KNMF), a large scale research infrastructure at KIT
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Using automated crystal-orientation mapping (ACOM) in TEM, we have shown the formation of an ultrafine grained (UFG) structure with predominantly (> 90%) high angle grain boundaries in C45 steel and Armco iron after high pressure torsion (HPT) at 350 degrees C. The UFG C45 steel exhibits a combination of high tensile strength and ductility and its mechanical properties were improved significantly compared to the analogously processed Armco iron. The higher strength of the processed C45 steel is attributed to the finer grain size, the highly fragmented cementite particles induced by the HPT deformation. The difference in ductility of the two materials is related to the distinct work hardening behaviors due to the different microstructural characteristics. (C) 2013 Elsevier B.V. All rights reserved.
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