Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Ghadbeigi, Hassan; Pinna, C.; Celotto, S.

doi:10.1016/j.msea.2013.09.048

Cited by 116 publications

(48 citation statements)

References 35 publications

(79 reference statements)

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“…These observations are also supported by a recent report by Han et al (2013). Ghadbeigi et al (2013) have demonstrated in a more recent work that martensite morphology is critical in early damage nucleation. Carrying out nanoindentation and micro-pillar compression experiments on martensite and ferrite regions in a DP steel, Ghassemi-Armaki et al (2014) have shown that ferrite hardness and strength is significantly heterogeneous even within a given grain.…”

Section: Introductionsupporting

confidence: 86%

“…Recently, it has been demonstrated that direct information on strain partitioning can be obtained using in-situ mechanical testing setups, which enable microstructural imaging during deformation and follow-up microscopic-digital image correlation (lDIC) analysis (Kang et al, 2007;Tasan et al, 2010;Ghadbeigi et al, 2010Ghadbeigi et al, , 2013Kapp et al, 2011;Joo et al, 2013;Marteau et al, 2013;Han et al, 2013). Kang et al (2007) have shown that strain partitioning between ferrite and martensite can be significantly decreased by a tempering treatment, leading to an increase in the critical damage nucleation strain.…”

Section: Introductionmentioning

confidence: 99%

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Strain localization and damage in dual phase steels investigated by coupled in-situ deformation experiments and crystal plasticity simulations

Taşan

Hoefnagels

Diehl

et al. 2014

International Journal of Plasticity

444

176

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a b s t r a c tFerritic-martensitic dual phase (DP) steels deform spatially in a highly heterogeneous manner, i.e. with strong strain and stress partitioning at the micro-scale. Such heterogeneity in local strain evolution leads in turn to a spatially heterogeneous damage distribution, and thus, plays an important role in the process of damage inheritance and fracture. To understand and improve DP steels, it is important to identify connections between the observed strain and damage heterogeneity and the underlying microstructural parameters, e.g. ferrite grain size, martensite distribution, martensite fraction, etc. In this work we pursue this aim by conducting in-situ deformation experiments on two different DP steel grades, employing two different microscopic-digital image correlation (lDIC) techniques to achieve microstructural strain maps of representative statistics and high-resolution. The resulting local strain maps are analyzed in connection to the observed damage incidents (identified by image post-processing) and to local stress maps (obtained from crystal plasticity (CP) simulations of the same microstructural area). The results reveal that plasticity is typically initiated within ''hot zones'' with larger ferritic grains and lower local martensite fraction. With increasing global deformation, damage incidents are most often observed in the boundary of such highly plastified zones. High-resolution lDIC and the corresponding CP simulations reveal the importance of martensite dispersion: zones with bulky martensite are more susceptible to macroscopic localization before the full strain hardening capacity of the material is consumed. Overall, the presented joint analysis establishes an integrated computational materials engineering (ICME) approach for designing advanced DP steels.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Strain localization and damage in dual phase steels investigated by coupled in-situ deformation experiments and crystal plasticity simulations

Taşan

Hoefnagels

Diehl

et al. 2014

International Journal of Plasticity

444

176

View full text Add to dashboard Cite

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“…The deformation of the ferrite grains along the loading y-axis is accompanied by extensive lateral contraction corresponding to an e xx strain magnitude on the order of 0.11. It has also been shown in other studies [14][15][16][17] that plastic deformation initiates at ferrite grains in multi-phase advanced high-strength steels.…”

Section: Digital Image Correlation Resultssupporting

confidence: 62%

“…[14][15][16][17] In this study, the minor strain (e xx ) component is first evaluated in order to assess the lateral contraction of the soft ferrite phase and its effect on the formation of microstructural bands during tensile loading. The major strains (e yy ) are then analyzed to investigate the distribution of major strains along the hard second-phase bands.…”

Section: Digital Image Correlation Resultsmentioning

confidence: 99%

“…[14][15][16][17] Several studies have been reported where in situ mechanical testing was conducted in a scanning electron microscope (SEM) for DP600 and DP1000 steel series. [14][15][16][17] Interrupted tensile testing at small displacement intervals enabled the capture of SEM micrographs to measure strain distributions at the scale of the individual grains and phases by correlating the various images. In a recent study, the DIC technique was employed to study the effect of microstructural banding in DP600 steels.…”

Section: Introductionmentioning

confidence: 99%

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Deformation-Induced Microstructural Banding in TRIP Steels

Celotto

Ghadbeigi

Pinna

et al. 2018

Metall Mater Trans A

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Microstructure inhomogeneities can strongly influence the mechanical properties of advanced high-strength steels in a detrimental manner. This study of a transformation-induced plasticity (TRIP) steel investigates the effect of pre-existing contiguous grain boundary networks (CGBNs) of hard second-phases and shows how these develop into bands during tensile testing using in situ observations in conjunction with digital image correlation (DIC). The bands form by the lateral contraction of the soft ferrite matrix, which rotates and displaces the CGBNs of second-phases and the individual features within them to become aligned with the loading direction. The more extensive pre-existing CGBNs that were before the deformation already aligned with the loading direction are the most critical microstructural feature for damage initiation and propagation. They induce micro-void formation between the hard second-phases along them, which coalesce and develop into long macroscopic fissures. The hard phases, retained austenite and martensite, were not differentiated as it was found that the individual phases do not play a role in the formation of these bands. It is suggested that minimizing the presence of CGBNs of hard second-phases in the initial microstructure will increase the formability.

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Review on Strain Localization Phenomena Studied by High‐Resolution Digital Image Correlation

Weidner

Biermann

2021

Adv Eng Mater

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She studied Materials Science in Freiberg and received her doctorate and habilitation. Her primary research interests focus on plasticity, fatigue, and related microstructural analysis of materials. Her particular interests are related to the application of complementary in situ characterization techniques for better understanding of kinetics of deformation and damage processes. To date she has authored or coauthored over 100 peer-reviewed publications.

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Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Cited by 116 publications

References 35 publications

Strain localization and damage in dual phase steels investigated by coupled in-situ deformation experiments and crystal plasticity simulations

Strain localization and damage in dual phase steels investigated by coupled in-situ deformation experiments and crystal plasticity simulations

Deformation-Induced Microstructural Banding in TRIP Steels

Review on Strain Localization Phenomena Studied by High‐Resolution Digital Image Correlation

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