Microstructure-based model for the static mechanical behaviour of multiphase steels

Bouquerel, Jérémie; Verbeken, Kim; Cooman, Bruno C. De

doi:10.1016/j.actamat.2005.10.059

Cited by 170 publications

(56 citation statements)

References 15 publications

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“…This increasing fraction of martensite would lead to local strain re-distribution among different phases and inhibit the transformation behaviors, as suggested in previous study (Knijf et al, 2014). Previous research also suggested that the continuous deformation with proper strain and stress partitioning among different phases based on the law of mixture can still keep a hardening potential without transformation and retard the onset of strain localization (Kuang et al, 2009;Knijf et al, 2014;Bouquerel et al, 2006;Kang et al, 2007;Jacques et al, 2007;Lani et al, 2007;Han et al, 2014;Fillafer et al, 2014;Tasan et al, 2014). Of course, this hardening potential should be much weaker than the strong hardening induced by martensite transformation.…”

Section: Discussionmentioning

confidence: 92%

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Yuan

Bian

Jiang

et al. 2015

Mechanics of Materials

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a b s t r a c tThe dynamic properties of an intercritically annealed 0.2C5Mn steel with ultrafine-grained austenite-ferrite duplex structure were studied under dynamic shear loading. The formation and evolution mechanisms of adiabatic shear band in this steel were then investigated using interrupted experiments at five different shear displacements and the subsequent microstructure observations. The dynamic shear plastic deformation of the 0.2C5Mn steel was observed to have three stages: the strong linear hardening stage followed by the plateau stage, and then the strain softening stage associated with the evolution of adiabatic shear band. High impact shear toughness was found in this 0.2C5Mn steel, which is due to the following two aspects: the strong linear strain hardening by martensite transformation at the first stage, and the suppressing for the formation of shear band by the continuous deformation in different phases through the proper stress and strain partitioning at the plateau stage. The evolution of adiabatic shear band was found to be a two-stage process, namely an initiation stage followed by a thickening stage. The shear band consists of two regions at the thickening stage: a core region and two transition layers. When the adjoining matrix is localized into the transition layers, the grains are refined along with increasing fraction of austenite phase by inverse transformation. However, when the transition layers are transformed into the core region, the fraction of austenite phase is decreased and almost disappeared due to martensite transformation again. These interesting observations in the core region and the transition layers should be attributed to the competitions of the microstructure evolutions associated with the non-uniformly distributed shear deformation and the inhomogeneous adiabatic temperature rise in the different region of shear band. The 0.2C5Mn TRIP steel reported here can be considered as an excellent candidate for energy absorbers in the automotive industry.

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Section: Discussionmentioning

confidence: 92%

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Yuan

Bian

Jiang

et al. 2015

Mechanics of Materials

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“…[28][29][30] To figure out a general overview of deformation mechanism and then to use such a modeling to steel design, flow stresses of constituent phases and transformation strain and kinetics have to be taken into consideration. Neutron diffraction experiments are very useful for verification of the established model and its development.…”

Section: Crystal Orientation Dependence Of Transformation During Tensmentioning

confidence: 99%

Tensile Behavior of a TRIP-aided Ultra-fine Grained Steel Studied by Neutron Diffraction

et al. 2011

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“…10) Another important aspect in TRIP-assisted steel is the influence of retained austenite volume fraction and their stability on mechanical behavior of steel, mainly the uniform elongation. 10,[11][12][13][14][15] Therefore the aim of present work was to investigate the effect of austempering thermal cycle on the microstructure formation and mechanical behavior of high carbon (0.6 % C) Si-Mn-Cr steel.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Microstructure of High Carbon Si–Mn–Cr Steel with Trip Effect

et al. 2009

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The influence of the thermal cycle and austempering treatment on the mechanical behavior of a 0.56C-1.43Si-0.58Mn-0.47Cr (wt%) steel has been investigated. The thermal cycle consisted of heating the steel to 800°C or 900°C, in the intercritical and austenitic region respectively, fast cooling down to 600°C or 400°C, followed by 300 s hold. After austempering the materials were cooled at different rates and then submitted to tensile testing. The total elongation of 15-20 % and tensile strength of 1 300-1 400 MPa were reached after heating to 900°C and transformation at 400°C. The strain-induced austenite transformation to martensite during the plastic deformation (Transformation Induced Plasticity Effect) is responsible for this combination of high strength and ductility. Silicon acts to stabilize the austenite during austempering. However, the stabilized austenite can be transformed and the microstructure modified, resulting in the formation of others constituents such as bainitic ferrite, upper bainite and martensite.

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Microstructure-based model for the static mechanical behaviour of multiphase steels

Cited by 170 publications

References 15 publications

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Tensile Behavior of a TRIP-aided Ultra-fine Grained Steel Studied by Neutron Diffraction

Mechanical Behavior and Microstructure of High Carbon Si–Mn–Cr Steel with Trip Effect

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