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

: Kadkhodapour, J.; Butz, A.; Rad, S.Z.

Preprint urn:nbn:de:0011-n-1633917 (15 MByte PDF)
MD5 Fingerprint: 351364ec1a685fec884e39fbc293bd75
Erstellt am: 16.10.2012

Acta Materialia 59 (2011), Nr.7, S.2575-2588
ISSN: 1359-6454
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()

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.