Examination and modeling of void growth kinetics in modern high strength dual phase steels during uniaxial tensile deformation

Ductile fracture mechanisms during uniaxial tensile testing of two different modern high strength dual phase steels, i.e. DP780 and DP980, were studied. Detailed microstructural characterization of the strained and sectioned samples was performed by scanning electron microscopy as well as EBSD exami...

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Bibliographic Details
Published in:Materials chemistry and physics 2016-04, Vol.172, p.54-61
Main Authors: Saeidi, N., Ashrafizadeh, F., Niroumand, B., Forouzan, M.R., Mohseni mofidi, S., Barlat, F.
Format: Article
Language:English
Subjects:
Cellular
Deformation
Dual phase steels
Ductility
Duplex stainless steels
Electron microscopy
Ferrite
Grain boundaries
High strength
High strength steels
Mathematical models
Mechanical properties
Strain
Voids
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Summary:Ductile fracture mechanisms during uniaxial tensile testing of two different modern high strength dual phase steels, i.e. DP780 and DP980, were studied. Detailed microstructural characterization of the strained and sectioned samples was performed by scanning electron microscopy as well as EBSD examination. The results revealed that interface decohesion, especially at martensite particles located at ferrite grain boundaries, was the most probable mechanism for void nucleation. It was also revealed that the creation of cellular substructure can reduce stored strain energy and thereby, higher true fracture strain was obtained in DP980 than DP780 steel. Prediction of void growth behavior based on some previously proposed models showed unreliable results. Therefore, a modified model based on Rice-Tracey family models was proposed which showed a very lower prediction error compared with other models. •Damage mechanism in two modern high strength dual phase steels was studied.•Creation of cellular substructures can reduce the stored strain energy within the ferrite grains.•The experimental values were examined by Agrawal as well as RT family models.•A modified model was proposed for prediction of void growth behavior of DP steels.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2015.12.059