Quantitative measurement of strain partitioning and slip systems in a dual-phase steel

Han, Qihang; Kang, Yonglin; Hodgson, Peter; Stanford, Nicole

doi:10.1016/j.scriptamat.2013.03.021

Cited by 90 publications

(16 citation statements)

References 21 publications

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“…Strong partitioning of local plastic strain between different phases is observed. The networklike plastic deformation maps observed in this work are similar to those reported earlier for Q&P intercritically annealed steels (De Diego-Calderón et al, 2014), Dual Phase (DP) steels (Kapp et al, 2011;Han et al, 2013) and Metal Matrix Composites (MMCs) (Kolednik and Unterweger, 2008). However, the ranges of local plastic strain values vary in all specimens: they are found to be in the range between 5% and 15.05%, 5.7% and 19.13% and 5.7% and 14.62% for the 244-400-100, the 244-400-500 and the 244-400-1000 samples, respectively.…”

Section: Global and Local Plastic Deformationsupporting

confidence: 88%

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

Diego-Calderón¹,

Knijf²,

Molina-Aldareguia³

et al. 2015

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Steel with a nominal composition of 0.25C-1.5Si-3Mn-0.023Al (mass %) was subjected to Quenching and Partitioning (Q&P) with varying parameters (quenching temperature, partitioning temperature and partitioning time) resulting in formation of multi-phase microstructure, which was thoroughly studied using X-ray (XRD) and Electron Backscatter Diffraction (EBSD). Mechanical properties of the Q&P steel were measured by tensile tests. Plastic deformation of Q&P steel at micro-scale was investigated by in situ tensile testing and digital image correlation analysis. The effect of Q&P parameters on the microstructure (phase composition, size and volume fraction of micro constituents, texture and carbon content in retained austenite) is discussed. After analyzing the mechanical properties, plastic deformation at the micro-scale and the microstructure, it is shown that the strain partitioning between phases strongly depends on the microstructure of the Q&P steel, which, in turn, can be tuned via manipulation with Q&P parameters. RESUMEN: Efecto de los parámetros de procesado en el desarrollo microestructural y en las propiedades mecánicas en aceros Q&P.Con el objetivo de evaluar el efecto de los parámetros de procesado en un acero con una composición nominal de 0,25C-1,5Si-3Mn-0,023Al (% masa), éste ha sido sometido a un tratamiento térmico denominado "Quenching and Partitioning" (Q&P), en el que se han variado la temperatura de "quenching", la temperatura de "partitioning" y el tiempo de "partitioning". Como resultado se ha obtenido una microestructura multifásica, la cual ha sido analizada en detalle utilizando difracción de rayos-X (XRD) y de electrones retrodispersados (EBSD). Asimismo, se han medido las propiedades mecánicas de los aceros Q&P mediante ensayos de tracción. La deformación plástica de los aceros Q&P a nivel micrométrico ha sido estudiada mediante ensayos "in situ" en el microscopio electrónico de barrido y la posterior aplicación de la técnica de correlación digital de imágenes. Se ha determinado el efecto de los parámetros de procesado en la microestructura (composición de fases, tamaño y fracción en volumen de los distintos micro constituyentes, textura y contenido en carbono en la austenita retenida). Una vez se han relacionado las propiedades mecánicas, la deformación plástica a nivel micrométrico y la microestructura, se concluye que la partición de la deformación entre fases depende en gran medida de la propia microestructura del acero Q&P, que a su vez puede ser ajustada a través de la manipulación de los parámetros de procesado.

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Section: Global and Local Plastic Deformationsupporting

confidence: 88%

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

Diego-Calderón¹,

Knijf²,

Molina-Aldareguia³

et al. 2015

REVMETAL

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“…Their results suggest that the most critical factor causing the strain heterogeneity is the local microstructural neighborhood rather than the specific grain orientation, shape or size. 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.…”

Section: Introductionsupporting

confidence: 85%

“…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%

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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“…These measurements can be used in combination with orientation maps of the investigated region to relate plastic deformation to the microstructure and starting crystal orientation (Lineau et al, 1997), (Hoc and Rey, 2000), (Hoc et al, 2003), (Jin et al, 2008), (Schroeter and McDowell, 2003) (Héripré et al, 2007) (Marteau et al, 2012)as well as local Schmid and Taylor factors (Kammers and Daly, 2013), (Tschopp et al, 2009) (Tasan et al, 2014), (Han et al, 2013) (Walley et al, 2012) and even texture and lattice curvatures after deformation (Lineau et al, 1997) (Tatschl and Kolednik, 2003) (Zhao et al, 2008) (Zhang and Tong, 2004). However, until recently, the spatial resolution of DIC measurements has been inferior to that of EBSD measurements and therefore insufficient to relate deformation to the lattice rotation and curvature at the required sub-micron scale.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of the polycrystalline plasticity of austenitic stainless steel

Gioacchino

Fonseca

2015

International Journal of Plasticity

168

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The development and validation of crystal plasticity models requires the ability to map deformation at the microstructural scale. Here, a new method of highresolution deformation mapping is used to measure strain, material rotation and lattice rotation in austenitic stainless steel at sub-micron resolution. Electron back-scatter diffraction maps are used to link the deformation to the microstructure. Deformation occurs in domains, in which most of the plastic strain originates from the activation of a single slip system with high resolved shear stress. Within domains, slip is localized in lamellar regions that increase in number with strain. The deformation incompatibility between grains that develops as a consequence of this single crystal like behaviour is accommodated by either a gradient in slip intensity and the consequent development of lattice curvature at the grain boundary or the activation of an additional high stressed slip system and the consequent formation of a complementary deformation domain within the grain. In many cases, however, lattice curvature across grain boundaries is small because the deformation domains in neighbouring grains are M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 compatible. The implications of these observations for continuum crystal plasticity modelling are discussed.

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Quantitative measurement of strain partitioning and slip systems in a dual-phase steel

Cited by 90 publications

References 21 publications

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

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

An experimental study of the polycrystalline plasticity of austenitic stainless steel

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