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  4. Mechanisms of void formation during tensile testing in a commercial, dual-phase steel
 
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2011
Journal Article
Titel

Mechanisms of void formation during tensile testing in a commercial, dual-phase steel

Abstract
A detailed analysis of the microstructure and failure mechanism of a dual-phase steel material as a function of strain was conducted. Accordingly, three tensile tests were performed and interrupted at different strain levels in order to investigate void nucleation, void growth and void coalescence. Scanning electron microscopy analysis revealed that void nucleation occurs by ferrite grain-boundary decohesion in the neighborhood of martensite grains. Further, void initiation could be observed between closely situated inartensite grains. Martensite morphology and distribution has a significant impact on the accumulation of damage. The mechanism of failure was found to be influenced by deformation localization due to microstructural inhomogeneity. Based on the experimental observations and simulation results, a model describing the failure mechanism is proposed for dual-phase steel material.
Author(s)
Kadkhodapour, J.
Butz, A.
Rad, S.Z.
Zeitschrift
Acta Materialia
DOI
10.1016/j.actamat.2010.12.039
File(s)
001.pdf (15.53 MB)
Language
English
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Fraunhofer-Institut für Werkstoffmechanik IWM
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