Modeling of deformation and rotation bands and of deformation induced grain boundaries in IF steel aggregate during large plane strain compression

Erieau, Philippe; Rey, Colette

doi:10.1016/j.ijplas.2003.11.014

Cited by 73 publications

(51 citation statements)

References 55 publications

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“…The model used in this paper was originally developed by Erieau and Rey [30]. The deformation gradient F can be decomposed into a lattice deformation gradient * and a plastic deformation gradient , by assuming that the material flows due to dislocation motion, and then the combination of elastic deformation and rigid body rotation [29]:…”

Section: Single Crystal Constitutive Equationsmentioning

confidence: 99%

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Sun

Becker

2016

International Journal of Mechanical Sciences

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract: Low cycle fatigue tests were carried out for a 304 stainless steel at room temperature. A series of experimental characterisations, including SEM, TEM, and XRD were conducted on for the 304 stainless steel to facilitate the understanding of the mechanical responses and microstructural behaviour of the material under cyclic loading including nanostructure, crystal structure and the fractured surface. The crystal plasticity finite element method (CPFEM) is a powerful tool for studying the microstructure influence on the cyclic plasticity behaviour. This method was incorporated into the commercially available software ABAQUS by coding a UMAT user subroutine. Based on the results of fatigue tests and material characterisation, the full set of material constants for the crystal plasticity model was determined. The CPFEM framework used in this paper can be used to predict the crack initiation sites based on the local accumulated plastic deformation and local plastic dissipation energy criterion, but with limitation in predicting the crack initiation caused by precipitates.

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Section: Single Crystal Constitutive Equationsmentioning

confidence: 99%

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Sun

Becker

2016

International Journal of Mechanical Sciences

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“…The used crystalline approach [1,2,3] can describe the interactions between the two phases and can compute the evolution of the local strain and stress fields as well as the density of dislocations and the rotation of the lattice in the different grains. Such crystalline modelling is now well known technique to determine the microstructure effect on the mechanical local behaviour of aggregates [4,5,6,7,8,9,10,11].…”

Section: Materials Supplied By Aubert and Duval Who Cofinance This Studymentioning

confidence: 99%

“…The hardening matrix su h evolves with increasing deformation, but depend on internal variables (dislocation densities on all slip systems) in order to take into account the physical aspects of plasticity [1,2,3]. On a given slip system (s), the evolution of the dislocation density s ρ is governed by a production term based on Orowan's relationship and by an annihilation term which takes into account the dynamic recovery during deformation.…”

Section: Crystalline Approachmentioning

confidence: 99%

“…Only self a ss and latent a su hardening are considered here. The physical meaning of all the parameters set is detailed in [3]. The parameters used for this simulation were identified using a polycrystalline model and an inverse method from experimental results obtained at different temperatures and deformation rates.…”

Section: Crystalline Approachmentioning

confidence: 99%

“…To avoid buckling for these large strains, the pattern thickness is set to 2µm. In this study, the 3D aggregate is composed of five similar layers and its dimensions are 48.6 x 48.6 x 10µm 3 . The purpose is to use five similar layers to study the intermediate layer and so to avoid stresses due to boundary conditions on the edges of the aggregate.…”

Section: Meshing and Boundary Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Polycrystalline Modelling of Udimet 720 Forging

Thébault¹,

Solas²,

Rey³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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A crystalline modelling of deformation implemented in a finite element code coupled to a recrystallization Cellular Automaton code is proposed and applied to forging processes of superalloys. The coupled modelling is used in order to obtain a better understanding of the microstructural evolution of superalloys during high temperature forging at different strain rates and temperatures. The framework of the modelling is large plastic deformation and large lattice rotation. The used internal variables are dislocations densities on slip systems of the different phases. Modelling is based on viscoplatic constitutive and hardening laws at the scale of the slip systems and describes local strain and stress fields as well as the stored energy and the rotation of the lattice in the grains of the microstructure. At different steps of deformation, formation of subgrains, annihilation of dislocations, nucleation, growth and new orientation of grains are computed. The 3D aggregates representing the superalloy, are built up from Electron Back Scattered Diffraction method (EBSD) by means of a high resolution Scanning Electron Microscope. The phases are identified by means of EBSD, chemical analysis (EDS) and observations with a Scanning Electron Microscope. In this paper the studied aggregate is realised from a semi product of Udimet 720. Such technique is able to give us, a realistic description of the crystalline orientation, morphology and position of grains in the aggregate. The Finite Element meshing is deduced from the EBSD analysis. At high temperature, the Udimet 720 is constituted by a γ matrix with a Face Centred Cubic structure (FCC) and γ' precipitates (Ni 3 (Ti,Al)) with a Simple Cubic structure (SC). The various material parameters used for the coupled modelling are previously determined from compression tests performed at several strain rate and temperature; The dislocation densities are measured from Transmission Electronic Microscope.

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INCONEL 718 Single and Multipass Modelling of Hot Forging

et al. 2012

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A better understanding of the competition between several mechanisms (dynamic recovery, dynamic recrystallization and plasticity hardening) is crucial for aircraft engine manufacturers. The aim of this paper is to improve the microstructure and therefore the mechanical properties of a nickel based superalloy used for rotating forged pieces. A nickel superalloy microstructure is the result of several successive hot forging processes: multipass processes, with intermediate dwell time and quenching. In this paper, an original three dimensional approach able to simulate these processes is proposed. The specific role of the different steps of the processes is analysed. In this approach, several forging thermo-mechanical parameters are taken into account: the working temperature, the strain rate, the final strain, the interpass time, etc. At high forging temperature, the studied INCONEL 718 presents an austenitic matrix γ (face centred cubic) assumed to be in a single phase.This approach proposes a sequential coupling of two models, one devoted to deformation and the other to recrystallization. Such a coupling enables the estimation of the effect of deformation and of different recrystallization types on mechanical behaviour and on micro-structural evolution. The approach is performed at the grain scale and takes into account the whole thermo-mechanical cycle with a focus on the dynamic behaviour.The first polycrystalline model is based on the plasticity mechanisms at the grains scale. The framework corresponds to finite transformations (large lattice rotations and small elastic strains). The model is implemented in ABAQUS and CAST3M finite element codes. The second model is based on the recrystallization theory and uses a 3D cellular automaton. It describes dynamic recrystallization phenomena such as nucleation-growth and static or postdynamic recrystallization. Such recrystallization mechanisms were observed during interpass time or during the successive heatings depending on the thermomechanical paths used in multipass forging. Dislocation densities are the internal variables common to the two models. The simulations are performed on a 3D Representative Elementary Volume (aggregate) obtained from Electron Back Scattering mapping. Numerical results are compared to experimental microstructures.

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Modeling of deformation and rotation bands and of deformation induced grain boundaries in IF steel aggregate during large plane strain compression

Cited by 73 publications

References 55 publications

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Polycrystalline Modelling of Udimet 720 Forging

INCONEL 718 Single and Multipass Modelling of Hot Forging

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