10 results on '"Smith-Zener pinning"'
Search Results
2. Dissolution of the Primary γ′ Precipitates and Grain Growth during Solution Treatment of Three Nickel Base Superalloys
- Author
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Karen Alvarado, Ilusca Janeiro, Sebastian Florez, Baptiste Flipon, Jean-Michel Franchet, Didier Locq, Christian Dumont, Nathalie Bozzolo, and Marc Bernacki
- Subjects
grain growth ,Smith–Zener pinning ,level-set ,full-field simulations ,superalloys ,dissolution kinetics ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Second phase particles (SPP) play an essential role in controlling grain size and properties of polycrystalline nickel base superalloys. The understanding of the behavior of these precipitates is of prime importance in predicting microstructure evolutions. The dissolution kinetics of the primary γ′ precipitates during subsolvus solution treatments were investigated for three nickel base superalloys (René 65, AD730 and N19). A temperature-time codependency equation was established to describe the evolution of primary γ′ precipitates of each material using experimental data, the Thermo-Calc software and the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model. The dissolution kinetics of precipitates was also simulated using the level-set (LS) method and the former phenomenological model. The precipitates are represented using an additional LS function and a numerical treatment around grain boundaries in the vicinity of the precipitates is applied to reproduce their pinning pressure correctly. Thus, considering the actual precipitate dissolution, these simulations aim to predict grain size evolution in the transient and stable states. Furthermore, it is illustrated how a population of Prior Particle Boundaries (PPB) particles can be considered in the numerical framework in order to reproduce the grain size evolution in the powder metallurgy N19 superalloy. The proposed full-field strategy is validated and the obtained results are in good agreement with experimental data regarding the precipitates and grain size.
- Published
- 2021
- Full Text
- View/download PDF
3. Dynamics of particle-assisted abnormal grain growth revealed through integrated three-dimensional microanalysis.
- Author
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Lu, Ning, Kang, Jiwoong, Senabulya, Nancy, Keinan, Ron, Gueninchault, Nicolas, and Shahani, Ashwin J.
- Subjects
- *
PARTICLE size distribution , *GRAIN , *CERAMIC metals , *THREE-dimensional imaging , *CRYSTAL grain boundaries - Abstract
Secondary-phase particles are routinely dispersed in metals and ceramics to prevent grain growth and take full advantage of the small grain size in the mechanical properties of polycrystals. Somewhat surprisingly, the preferential or abnormal growth of a few grains is observed in particle-containing systems at relatively high temperature, which will limit the lifetime of the material. The origins and mechanisms of particle-assisted abnormal grain growth are widely contested. Here, we employ integrated three-dimensional X-ray imaging to throw new light on the complex interactions between grain boundaries and particles in an Al–Cu alloy as a model system. We observe abnormal grain growth in the presence of a highly non-random distribution of particles. The incipient grain size is set by the local distribution of particles such that the larger grains come from particle-poor regions. Subsequently, grains with a size advantage may "run away" from the grain size distribution, in agreement with predictions from an analytical model that takes into account the competing capillary and particle pinning pressures. Image, graphical abstract [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
4. Prediction of the grain size evolution during thermal treatments at the mesoscopic scale: a numerical framework and industrial examples.
- Author
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Delaunois, Fabienne, Vitry, Véronique, Roudet, Francine, Settefrati, Amico, de Micheli, Pascal, Maire, Ludovic, Scholtes, Benjamin, Bozzolo, Nathalie, Moussa, Charbel, Perchat, Etienne, and Bernacki, Marc
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MESOSCOPIC systems ,LEVEL set methods ,SIMULATION methods & models ,RECRYSTALLIZATION (Metallurgy) ,INDUSTRIAL applications - Abstract
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- Published
- 2018
- Full Text
- View/download PDF
5. A level set approach to simulate grain growth with an evolving population of second phase particles
- Author
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Sebastian Florez, Baptiste Flipon, Marc Bernacki, Nathalie Bozzolo, Karen Alvarado, Centre de Mise en Forme des Matériaux (CEMEF), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Chaire DIGIMU, and ANR-16-CHIN-0001,DIGIMU,Développement d'un cadre numérique global et innovant pour la modélisation des évolutions microstructurales à l'œuvre dans les procédés industriels de mise en forme des alliages métalliques.(2016)
- Subjects
Materials science ,Population ,02 engineering and technology ,Grain boundary ,01 natural sciences ,Smith-Zener pinning ,Forging ,[SPI.MAT]Engineering Sciences [physics]/Materials ,0103 physical sciences ,General Materials Science ,Solvus ,education ,010302 applied physics ,education.field_of_study ,Evolving population of second phase particles ,Mechanics ,Level set ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation ,Finite element method ,Grain size ,Computer Science Applications ,Grain growth ,Mechanics of Materials ,Modeling and Simulation ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Deformation (engineering) ,0210 nano-technology - Abstract
In numerous polycrystalline materials, grain size is controlled by second phase particles (SPPs) that hinder the grain boundaries (GBs) by pinning mechanisms. The Smith–Zener pinning (SZP) model describes the physical interaction between SPPs and GBs. Both of them can evolve when applying a heat treatment to the material. As industrial forging processes involve hot deformation steps near the solvus temperature, it is thus of prime importance to characterize the evolution of the SPPs due to their impact on the final microstructure, notably on the grain size. The level set (LS) method is classically used to describe the influence of SPPs on grain growth (GG) by considering the simulated particles as inert and represented by static holes in the used finite element (FE) mesh. A new formalism to model GG mechanism under the influence of the SZP phenomenon, able to take into account evolving particles is proposed. It involves the representation of SPPs by a LS function and a particular numerical treatment around the grain interfaces encountering SPP, making possible the modelling of SPPs evolution without altering the undergoing pinning pressure. Validation and comparison of the new method regarding previous FE-LS formulation in 2D and 3D simulations and an application on GG under the influence of dissolving particles are described.
- Published
- 2021
6. Dissolution of the Primary γ ′ Precipitates and Grain Growth during Solution Treatment of Three Nickel Base Superalloys.
- Author
-
Alvarado, Karen, Janeiro, Ilusca, Florez, Sebastian, Flipon, Baptiste, Franchet, Jean-Michel, Locq, Didier, Dumont, Christian, Bozzolo, Nathalie, and Bernacki, Marc
- Subjects
NICKEL ,CRYSTAL grain boundaries ,POWDER metallurgy ,NUMERICAL functions ,CODEPENDENCY ,NICKEL alloys - Abstract
Second phase particles (SPP) play an essential role in controlling grain size and properties of polycrystalline nickel base superalloys. The understanding of the behavior of these precipitates is of prime importance in predicting microstructure evolutions. The dissolution kinetics of the primary γ ′ precipitates during subsolvus solution treatments were investigated for three nickel base superalloys (René 65, A D 730 and N 19 ). A temperature-time codependency equation was established to describe the evolution of primary γ ′ precipitates of each material using experimental data, the T h e r m o - C a l c software and the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model. The dissolution kinetics of precipitates was also simulated using the level-set (LS) method and the former phenomenological model. The precipitates are represented using an additional LS function and a numerical treatment around grain boundaries in the vicinity of the precipitates is applied to reproduce their pinning pressure correctly. Thus, considering the actual precipitate dissolution, these simulations aim to predict grain size evolution in the transient and stable states. Furthermore, it is illustrated how a population of Prior Particle Boundaries (PPB) particles can be considered in the numerical framework in order to reproduce the grain size evolution in the powder metallurgy N19 superalloy. The proposed full-field strategy is validated and the obtained results are in good agreement with experimental data regarding the precipitates and grain size. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
7. Probabilistic and deterministic full field approaches to simulate recrystallization in ODS steels
- Author
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B. Hary, Thierry Baudin, Flore Villaret, Ludovic Maire, Roland E. Logé, Marc Bernacki, Y. de Carlan, Centre de Mise en Forme des Matériaux (CEMEF), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Institut de Chimie du CNRS (INC)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Ecole Polytechnique Fédérale de Lausanne (EPFL), and MINES ParisTech - École nationale supérieure des mines de Paris
- Subjects
level set approach ,monte-carlo ,Materials science ,General Computer Science ,Nuclear engineering ,Monte Carlo method ,General Physics and Astronomy ,Numerical modeling ,02 engineering and technology ,Grain growth Recrystallization ,010402 general chemistry ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,ODS ,General Materials Science ,Level-Set Method ,grain-growth ,computer-simulation ,Smith-Zener Pinning ,Probabilistic logic ,temperature ,Recrystallization (metallurgy) ,Recrystallization ,Grain Growth ,General Chemistry ,Full field ,021001 nanoscience & nanotechnology ,Microstructure ,0104 chemical sciences ,Computational Mathematics ,Mechanics of Materials ,Martensite ,stored energy ,dispersion ,0210 nano-technology - Abstract
International audience; Mechanical and functional properties of Oxide Dispersion Strengthened (ODS) ferritic/martensitic steels are strongly related to their microstructures. Thus, numerical modeling of microstructure evolution during ODS forming is of prime importance. In this work, two well-known full field methodologies dedicated to re-crystallization modeling, the level-set and the Monte Carlo methods, are applied, discussed and compared to experimental data in their ability to describe properly recrystallization for ODS steels.
- Published
- 2020
8. Prediction of the grain size evolution during thermal treatments at the mesoscopic scale: a numerical framework and industrial examples
- Author
-
Settefrati, Amico, De Micheli, Pascal, Maire, Ludovic, Scholtes, Benjamin, Bozzolo, Nathalie, Moussa, Charbel, Perchat, Etienne, Bernacki, Marc, Transvalor S. A., Centre de Mise en Forme des Matériaux (CEMEF), MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Level Set numerical method ,Mesoscale modeling ,Finite element modeling ,Smith-Zener pinning ,Grain growth ,[SPI.MAT]Engineering Sciences [physics]/Materials - Abstract
International audience; Recently, an original full field model working at the mesoscopic scale using the level set (LS) method in a finite element (FE) framework has been introduced. This approach has demonstrated its potential for the simulation of grain growth and recrystallization problems. Through the development of the DIGIMU ® software, this methodology is now considered for industrial applications. The paper presents (i) the recent developments made on the LS approach and (ii) some examples of large scale simulations in two and three dimensions considering thermal treatments applied on materials. Grain boundaries motion considering the presence or not of second phase particles (like precipitates) are investigated.
- Published
- 2018
9. Probabilistic and deterministic full field approaches to simulate recrystallization in ODS steels.
- Author
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Villaret, F., Hary, B., de Carlan, Y., Baudin, T., Logé, R., Maire, L., and Bernacki, M.
- Subjects
- *
MONTE Carlo method , *PROBABILISTIC number theory , *STEEL , *DISPERSION strengthening - Abstract
Mechanical and functional properties of Oxide Dispersion Strengthened (ODS) ferritic/martensitic steels are strongly related to their microstructures. Thus, numerical modeling of microstructure evolution during ODS forming is of prime importance. In this work, two well-known full field methodologies dedicated to recrystallization modeling, the level-set and the Monte Carlo methods, are applied, discussed and compared to experimental data in their ability to describe properly recrystallization for ODS steels. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
10. Prediction of the grain size evolution during thermal treatments at the mesoscopic scale: a numerical framework and industrial examples
- Author
-
Benjamin Scholtes, Charbel Moussa, Ludovic Maire, Pascal de Micheli, Nathalie Bozzolo, Amico Settefrati, Etienne Perchat, Marc Bernacki, Transvalor S. A., Centre de Mise en Forme des Matériaux (CEMEF), MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Mesoscopic physics ,Materials science ,Level Set numerical method ,business.industry ,Mesoscale modeling ,Recrystallization (metallurgy) ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Smith-Zener pinning ,01 natural sciences ,Grain size ,Finite element method ,Grain growth ,[SPI.MAT]Engineering Sciences [physics]/Materials ,0104 chemical sciences ,Software ,Thermal ,General Materials Science ,Grain boundary ,Statistical physics ,Finite element modeling ,0210 nano-technology ,business - Abstract
Recently, an original full field model working at the mesoscopic scale using the level set (LS) method in a finite element (FE) framework has been introduced. This approach has demonstrated its potential for the simulation of grain growth and recrystallization problems. Through the development of the DIGIMU® software, this methodology is now considered for industrial applications. The paper presents (i) the recent developments made on the LS approach and (ii) some examples of large scale simulations in two and three dimensions considering thermal treatments applied on materials. Grain boundaries motion considering the presence or not of second phase particles (like precipitates) are investigated.
- Published
- 2018
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