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An experimental and microstructural investigation of biaxial Bauschinger effects in IF steel DC06 using in-situ neutron diffraction

Wednesday (26.09.2018)
16:30 - 16:45 S1/01 - A03
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Classically, the Bauschinger effect refers to a reduction of yield strength after a load path change under uniaxial loading. In this study, we present first results of an experimental investigation on Bauschinger effects in the sheet metal DC06 subjected to in-plane biaxial loading: We first performed biaxial tensile tests with cruciform specimens up to different pre-strains. Then, smaller specimens were prepared from the biaxially deformed inner part of the cruciform specimens. With these smaller specimens, we performed biaxial compression tests in a newly developed test-rig. The material exhibits distinct Bauschinger effects when subjected to biaxial load path changes, which result in different mechanical properties compared to the behavior under uniaxial load. We discuss how these novel Bauschinger effects can be rationalized by considering the results of TEM and HR-EBSD investigations at the different stages of biaxial loading. Furthermore, residual stress measurements by in-situ neutron diffraction were performed. After the biaxial tensile deformation, compressive residual stresses can be detected; these residual stresses facilitate yielding under biaxial compression and clearly affect the observed Bauschinger effects.

Dr.-Ing. Markus Härtel
Chemnitz University of Technology
Additional Authors:
  • Dr. Tobias Panzner
    Paul Scherrer Institute PSI
  • Dr. Enrico Bruder
    Technische Universität Darmstadt
  • Dr. Stefan Schmaltz
    Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
  • Dr. Steven van Petegm
    Paul Scherrer Institute PSI
  • Prof. Dr. Kai Willner
    Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
  • Prof. Dr. Helena van Swygenhoven
    École Polytechnique Fédérale de Lausanne EPFL
  • Prof. Dr. Martin F.-X. Wagner
    Chemnitz University of Technology