Retardation of plastic instability via damage-enabled micro-strain delocalization

J.P.M. Hoefnagels (Corresponding author), C.C. Tasan, F. Maresca, F.J. Peters, V. Kouznetsova

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)

Abstract

Multi-phase microstructures with high mechanical contrast phases are prone to microscopic damage mechanisms. For ferrite–martensite dual-phase steel, for example, damage mechanisms such as martensite cracking or martensite–ferrite decohesion are activated with deformation, and discussed often in literature in relation to their detrimental role in triggering early failure in specific dual-phase steel grades. However, both the micromechanical processes involved and their direct influence on the macroscopic behavior are quite complex, and a deeper understanding thereof requires systematic analyses. To this end, an experimental–theoretical approach is employed here, focusing on three model dual-phase steel microstructures each deformed in three different strain paths. The micromechanical role of the observed damage mechanisms is investigated in detail by in-situ scanning electron microscopy tests, quantitative damage analyses, and finite element simulations. The comparative analysis reveals the unforeseen conclusion that damage nucleation may have a beneficial mechanical effect in ideally designed dual-phase steel microstructures (with effective crack-arrest mechanisms) through microscopic strain delocalization.
LanguageEnglish
Pages6682-6897
Number of pages16
JournalJournal of Materials Science
Volume50
Issue number21
DOIs
StatePublished - 2015

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Steel
Martensite
Plastics
Microstructure
Ferrite
Nucleation
Cracks
Scanning electron microscopy

Cite this

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title = "Retardation of plastic instability via damage-enabled micro-strain delocalization",
abstract = "Multi-phase microstructures with high mechanical contrast phases are prone to microscopic damage mechanisms. For ferrite–martensite dual-phase steel, for example, damage mechanisms such as martensite cracking or martensite–ferrite decohesion are activated with deformation, and discussed often in literature in relation to their detrimental role in triggering early failure in specific dual-phase steel grades. However, both the micromechanical processes involved and their direct influence on the macroscopic behavior are quite complex, and a deeper understanding thereof requires systematic analyses. To this end, an experimental–theoretical approach is employed here, focusing on three model dual-phase steel microstructures each deformed in three different strain paths. The micromechanical role of the observed damage mechanisms is investigated in detail by in-situ scanning electron microscopy tests, quantitative damage analyses, and finite element simulations. The comparative analysis reveals the unforeseen conclusion that damage nucleation may have a beneficial mechanical effect in ideally designed dual-phase steel microstructures (with effective crack-arrest mechanisms) through microscopic strain delocalization.",
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Retardation of plastic instability via damage-enabled micro-strain delocalization. / Hoefnagels, J.P.M. (Corresponding author); Tasan, C.C.; Maresca, F.; Peters, F.J.; Kouznetsova, V.

In: Journal of Materials Science, Vol. 50, No. 21, 2015, p. 6682-6897.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Hoefnagels,J.P.M.

AU - Tasan,C.C.

AU - Maresca,F.

AU - Peters,F.J.

AU - Kouznetsova,V.

PY - 2015

Y1 - 2015

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AB - Multi-phase microstructures with high mechanical contrast phases are prone to microscopic damage mechanisms. For ferrite–martensite dual-phase steel, for example, damage mechanisms such as martensite cracking or martensite–ferrite decohesion are activated with deformation, and discussed often in literature in relation to their detrimental role in triggering early failure in specific dual-phase steel grades. However, both the micromechanical processes involved and their direct influence on the macroscopic behavior are quite complex, and a deeper understanding thereof requires systematic analyses. To this end, an experimental–theoretical approach is employed here, focusing on three model dual-phase steel microstructures each deformed in three different strain paths. The micromechanical role of the observed damage mechanisms is investigated in detail by in-situ scanning electron microscopy tests, quantitative damage analyses, and finite element simulations. The comparative analysis reveals the unforeseen conclusion that damage nucleation may have a beneficial mechanical effect in ideally designed dual-phase steel microstructures (with effective crack-arrest mechanisms) through microscopic strain delocalization.

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