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Open AccessArticle

Microstructural Influences on Fracture at Prior Austenite Grain Boundaries in Dual-Phase Steels

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Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
*
Author to whom correspondence should be addressed.
Materials 2019, 12(22), 3687; https://doi.org/10.3390/ma12223687 (registering DOI)
Received: 12 October 2019 / Revised: 30 October 2019 / Accepted: 6 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue Micromechanics: Experiment, Modeling and Theory)
Dual phase (DP) steels provide good strength and ductility properties. Nevertheless, their forming capability is limited due to the damage characteristics of their constituting microstructural phases and interfaces. In this work, a specific type of interface is analysed, i.e., prior austenite grain boundaries (PAGBs). In the literature, prior austenite grain boundary fracture has been reported as an important damage mechanism of DP-steels. The influence of the morphology of phase boundaries near the PAGB and the role of the martensite substructure in the vicinity of a PAGB on damage initiation is analysed. The experimentally observed preferred sites of crack nucleation along the PAGB are assessed and clarified. A finite strain rate dependent crystal plasticity model accounting for the anisotropic elasto-plasticity of martensite (and also ferrite) was applied to an idealized volume element approximating a typical small-scale PAGB microstructure. The boundary value problem is solved using a fast Fourier transform (FFT) based spectral solver. The role of crystallography and geometrical features within the volume element is studied using simulations. Results are discussed considering possibly dominant regimes of elasticity and plasticity. View Full-Text
Keywords: DP steels; prior austenite grain boundaries; martensite variants DP steels; prior austenite grain boundaries; martensite variants
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Sharma, L.; Peerlings, R.H.J.; Geers, M.G.D.; Roters, F. Microstructural Influences on Fracture at Prior Austenite Grain Boundaries in Dual-Phase Steels. Materials 2019, 12, 3687.

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