The Coupled Model of a Microstructure Evolution and a Flow Stress Based on the Dislocation Theory

Svyetlichnyy, Dmytro

doi:10.2355/isijinternational.45.1187

Cited by 24 publications

(27 citation statements)

References 18 publications

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“…Different models and methods were implemented into different FEM codes for confirmation of their effectiveness. Internal variables models are represented by the original model [16] and by the modified state variables model, which receives properties of IVM with introduction of the three internal variables [14]. State variables models (SVM) are represented by the Sellars-Davenport model, table method with nonlinear interpolation and others.…”

Section: Discussionmentioning

confidence: 99%

“…But it is calculated in the way proposed by Svyetlichnyy [14]. Four differential state equations are used for the extended volume V ex calculations.…”

Section: Internal Variable Modelmentioning

confidence: 99%

“…Another multiplicative IVM was developed [14] and validated [15] by Svyetlichnyy in order to take into account the recrystallization process. The model demonstrates exceptional ability for a proper description evolution of the dislocation density not only during the deformation but also after it.…”

Section: Introductionmentioning

confidence: 99%

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Flow stress models for deformation under varying condition—finite element method simulation

Svyetlichnyy

Nowak

Biba³

et al. 2016

Int J Adv Manuf Technol

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This work presents description and comparison of internal and state variable models of flow stress in varying processing conditions. Three models were analyzed. The first one is based on dislocation theory and describing the mechanical behavior of f.c.c. polycrystalline structures. The second and third models are standard and modified Sellars' flow stress models. Models were adapted for two commercial codes based on finite element method: QForm7 and Forge 2005. The compression test of 45 grade steel with instant changes of strain rate was simulated. Calculated compression force and flow stress were compared with the experimental data from plastometric tests. The forging process was simulated by QForm7. Results obtained by both internal and modified Sellars' models confirm their high accuracy for analysis and prediction of the flow stress under the varying deformation conditions.

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Section: Discussionmentioning

confidence: 99%

“…But it is calculated in the way proposed by Svyetlichnyy [14]. Four differential state equations are used for the extended volume V ex calculations.…”

Section: Internal Variable Modelmentioning

confidence: 99%

See 1 more Smart Citation

Flow stress models for deformation under varying condition—finite element method simulation

Svyetlichnyy

Nowak

Biba³

et al. 2016

Int J Adv Manuf Technol

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“…The models of the dislocation density, nucleation and growth of recrystallized grains are described in detail elsewhere. 22,23) Here, they are presented shortly. The following model of the dislocation density is applied for all grains.…”

Section: Recrystallizationmentioning

confidence: 99%

Simulation of Microstructure Evolution during Shape Rolling with the Use of Frontal Cellular Automata

Svyetlichnyy

2012

ISIJ Int.

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The objective of the paper is an application of the model of the microstructure evolution based on three-dimensional cellular automata (CA) for hot shape rolling simulation. A short description of frontal cellular automata (FCA) is presented. The model contains two parts: the deformation and the microstructure evolution. The CA cells do not remain as undistorted cubes, but they are deformed according to the strain tensor. The independence of the grain growing from the shape and the sizes of the cell is ensured by the so-called "virtual front tracking". The microstructural part of the model simulates two phenomena: the nucleation and the growth of nuclei. There are three issues considered in the paper: the creation of the initial microstructure, the recrystallization and the phase transformation. When recrystallization is simulated, the nucleation and the grain boundary migration depend on the deformation parameters such as: the temperature, the strain, the strain rate, the dislocation density and the crystallographic orientation. The nucleation during the phase transformation is a function of the cooling rate and the final microstructure. These phenomena along with the deformation can be modeled over a wide range of multi-stage deformation processes. The process of shape rolling is chosen as an example. The data needed for the FCA calculations is received from the modeling by the finite element method. The results of the simulation of the microstructure evolution, during the last three passes of the round bars rolling with the consequent phase transformation, are presented in the paper.

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“…and after deformation, however, limited studies have been reported on the microstructural evolution in terms of recrystallized volume fraction and grain size. A large group of these models are based on the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation approach [15][16][17][18][19][20][21]. However, the ideal JMAK behavior is rarely exhibited by real materials.…”

Section: Introductionmentioning

confidence: 99%

A mean field model of dynamic and post-dynamic recrystallization predicting kinetics, grain size and flow stress

Beltran

Huang

Logé

2015

Computational Materials Science

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a b s t r a c tA physically-based two-site mean field model has been developed to describe the microstructural evolution due to recrystallization during and after deformation. The model has been applied to predict the recrystallized fraction, recrystallized grain size, and flow stress of 304L austenitic stainless steel during discontinuous dynamic recrystallization (DDRX), post-dynamic recrystallization (PDRX) and grain growth (GG). The model parameters vary with temperature and strain rate but do not depend on grain size. In PDRX and GG regime, the parameters only depend on temperature. The model responds well to conditions with different temperatures, strain rates, strains and/or annealing times. Particular attention is paid to the occurrence of two-stage growth in the recrystallized grain size plots when PDRX occurs. There is a good quantitative agreement between model predictions and experimental results obtained in the different recrystallization regimes, opening the possibility of modeling multi-pass operations compatible with industrial applications.

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The Coupled Model of a Microstructure Evolution and a Flow Stress Based on the Dislocation Theory

Cited by 24 publications

References 18 publications

Flow stress models for deformation under varying condition—finite element method simulation

Flow stress models for deformation under varying condition—finite element method simulation

Simulation of Microstructure Evolution during Shape Rolling with the Use of Frontal Cellular Automata

A mean field model of dynamic and post-dynamic recrystallization predicting kinetics, grain size and flow stress

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