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  4. Site-specific quasi in situ investigation of primary static recrystallization in a low carbon steel
 
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2019
Journal Article
Title

Site-specific quasi in situ investigation of primary static recrystallization in a low carbon steel

Abstract
Low-alloyed steels with body-centered cubic crystal structure are a material class that is widely used for sheet metal forming applications. When having an adequate crystallographic texture and microstructure, their mechanical behavior is characterized by an isotropic in-plane flow behavior in combination with a low yield strength. The decisive processing steps for obtaining these beneficial mechanical properties are cold rolling and subsequent annealing. While for the former the number of passes, the deformation rates, and the total thickness reduction are the main processing parameters, the latter is described mainly by the heating rate and the holding temperature and time. Primary static recrystallization during annealing subsequent to the cold rolling process alters mainly two aspects of the material state: It firstly replaces the elongated and heavily deformed grains of the cold rolled microstructure by small, globular grains with low dislocation density and secondly it changes the crystallographic texture insofar as it typically diminishes the a- and strengthens the g-fiber texture components. In the present work, the recrystallization behavior of a commercial non-alloyed low carbon steel is studied. A quasi in situ setup that enables site-specific characterization is employed to gain a local picture of the nucleation and recrystallization process. From the Kernel Average Misorientation (KAM) values of the deformation structure, the tendency to be consumed by new grains can be predicted. Crystallographic analysis shows that the most deformed regions have either a g-fiber orientation or belong to heavily fragmented regions. New grains nucleate especially in such highly deformed regions and inherit often the orientation from the deformation microstructure.
Author(s)
Diehl, Martin
Max-Planck-Institut für Eisenforschung GmbH
Kertsch, Lukas  orcid-logo
Fraunhofer-Institut für Werkstoffmechanik IWM  
Traka, Konstantina
Max-Planck-Institut für Eisenforschung GmbH; TU Delft
Helm, Dirk  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Raabe, Dierk
Max-Planck-Institut für Eisenforschung GmbH
Journal
Materials Science and Engineering, A. Structural materials, properties, microstructure and processing  
Project(s)
Thermo-chemo-mechanical coupling during thermomechanical processing of microalloyed steels  
Funding(s)
SPP 1713
Funder
Deutsche Forschungsgemeinschaft DFG
Deutsche Forschungsgemeinschaft DFG
Open Access
DOI
10.1016/j.msea.2019.02.032
Additional full text version
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Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • recrystallization

  • DC04 steel

  • EBSD

  • site-specific characterization

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