Micromechanical characterisation of TRIP-assisted multiphase steels by<i>in situ</i>neutron diffraction

Jacques, Pascal; Furnémont, Quentin; Godet, Stéphane; Pardoen, Thomas; Conlon, K. T.; Delannay, Francis

doi:10.1080/14786430500529359

Cited by 90 publications

(63 citation statements)

References 24 publications

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“…Under these circumstances most of the plastic deformation induced by the martensitic transformation will occur in the relatively soft ferritic phase [12]. However, a high carbon concentration may also increase the resistance to transformation, hence plastic deformations may occur in the austenitic phase despite a high yield strength [17].…”

Section: Introductionmentioning

confidence: 99%

“…(23) Observe that the volume fraction of austenite ξ A is not used as an independent state variable since it is related to ξ via (3) 3 . Combining (18), (21), and (23) with (17) leads to the following expression for the dissipation:…”

Section: Thermodynamical Relationsmentioning

confidence: 99%

“…Invoking (11), (13), and (16), the internal thermal power ρ 0 θη appearing in (17) can be elaborated as…”

Section: Thermodynamical Relationsmentioning

confidence: 99%

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Crystallographically based model for transformation-induced plasticity in multiphase carbon steels

Tjahjanto

Turteltaub

Suiker

2007

Continuum Mech. Thermodyn.

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The microstructure of multiphase steels assisted by transformation-induced plasticity consists of grains of retained austenite embedded in a ferrite-based matrix. Upon mechanical loading, retained austenite may transform into martensite, as a result of which plastic deformations are induced in the surrounding phases, i.e., the ferrite-based matrix and the untransformed austenite. In the present work, a crystallographically based model is developed to describe the elastoplastic transformation process in the austenitic region. The model is formulated within a large-deformation framework where the transformation kinematics is connected to the crystallographic theory of martensitic transformations. The effective elastic stiffness accounts for anisotropy arising from crystallographic orientations as well as for dilation effects due to the transformation. The transformation model is coupled to a single-crystal plasticity model for a face-centered cubic lattice to quantify the plastic deformations in the untransformed austenite. The driving forces for transformation and plasticity are derived from thermodynamical principles and include lower-length-scale contributions from surface and defect energies associated to, respectively, habit planes and dislocations. In order to demonstrate the essential features of the model, simulations are carried out for austenitic single crystals subjected to basic loading modes. To describe the elastoplastic response of the ferritic matrix in a multiphase steel, a crystal plasticity model for a body-centered cubic lattice is adopted. This model includes the effect of nonglide stresses in order to reproduce the asymmetry of slips in the twinning and antitwinning directions that characterizes the behavior of this type of lattices. The models for austenite and ferrite are combined to simulate the microstructural behavior of a multiphase steel. The results of the simulations show the relevance of including plastic deformations in the austenite in order to predict a more realistic evolution of the transformation process.

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Section: Introductionmentioning

confidence: 99%

Section: Thermodynamical Relationsmentioning

confidence: 99%

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Crystallographically based model for transformation-induced plasticity in multiphase carbon steels

Tjahjanto

Turteltaub

Suiker

2007

Continuum Mech. Thermodyn.

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“…The flow parameters used for each phases are motivated from experimental and modelling efforts on a specific grade of TRIP assisted multiphase steels (Furnémont, 2003;Jacques et al, 2006Jacques et al, , 2007, see Table 1. The behaviour of the surrounding composite is described by the classical J 2 flow theory.…”

Section: Materials and Loading Parametersmentioning

confidence: 99%

Analysis of size effects associated to the transformation strain in TRIP steels with strain gradient plasticity

Mazzoni-Leduc

Pardoen

Massart

2010

European Journal of Mechanics - A/Solids

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International audienceThe size dependent strenghtening resulting from the transformation strain in Transformation Induced Plasticity (TRIP) steels is investigated using a two dimensional embedded cell model of a simplified microstructure composed of small cylindrical metastable austenitic inclusions within a ferritic matrix. Earlier studies have shown that within the framework of classical plasticity or of the single length parameter Fleck-Hutchinson strain gradient plasticity theory, the transformation strain has no significant impact on the overall strengthening. The strengthening is essentially coming from the composite effect with a marked inclusion size effect resulting from the appearance during deformation of new boundaries constraining the plastic flow. The three parameters version of the Fleck-Hutchinson strain gradient plasticity theory is used here in order to better capture the effect of the plastic strain gradients resulting from the transformation strain. The three parameters theory incorporates separately the rotational and extensional gradients in the formulation, which leads to a significant influence of the shear component of the transformation strain, not captured by the single parameter theory. When the size of the austenitic inclusions decreases, the overall strengthening increases due to a combined size dependent effect of the transformation strain and of the evolving composite structure. A parametric study is proposed and discussed in the light of experimental evidences giving indications on the optimization of the microstructure of TRIP-assisted multiphase steels

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“…The nucleation criterion and kinetic law used for the ferrite and the austenite are formally similar (only the values of the model parameters are distinct). Experimental evidence indicates that in high-carbon martensite the behavior is mostly elastic until fracture, which occurs at high stress levels (see [4]). Consequently, Frank-Read sources originally located in the austenitic phase that, due to a phase transformation, become embedded in the martensitic phase, are deactivated.…”

Section: Evolution Of Microstructurementioning

confidence: 99%

Effect of austenitic crystal orientation in a multiphase steel analyzed by a discrete dislocation-transformation model

2009

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A discrete dislocation-transformation model is used to analyze the response of an aggregate of ferritic and austenitic grains that can transform into martensite. In particular, the influence of the crystal orientation of the austenitic grains on the plastic and transformation behavior is studied. It is found that the austenitic crystal orientation has a stronger effect on the plastic behavior than on the transformation behavior. The transformation rate predicted by the discrete model only indicates a weak dependency on the austenitic crystal orientation.

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Micromechanical characterisation of TRIP-assisted multiphase steels byin situneutron diffraction

Cited by 90 publications

References 24 publications

Crystallographically based model for transformation-induced plasticity in multiphase carbon steels

Crystallographically based model for transformation-induced plasticity in multiphase carbon steels

Analysis of size effects associated to the transformation strain in TRIP steels with strain gradient plasticity

Effect of austenitic crystal orientation in a multiphase steel analyzed by a discrete dislocation-transformation model

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