A Physics-Based Mean-Field Model for Ferrite Recovery and Recrystallization

Allain, Sébastien; Moreno, Marc; Lamari, Mathias; Zurob, Hatem S.; Teixeira, Julien; Bonnet, Frédéric

doi:10.3390/met10050622

Cited by 5 publications

(4 citation statements)

References 35 publications

(73 reference statements)

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“…The order of magnitude of the critical heating rate for this transition between two modes of interaction (the so-called "weak" and "strong" interactions) is in accordance with previous studies on similar systems [2,28,73]. Detailed experimental and modelling study of recrystallization is presented in [55,74]. Regarding the pearlitic ferrite, no significant recrystallization occurs during both slow and fast heating, as confirmed by EBSD analyses.…”

Section: Microstructure Evolutions During Heating To Ac1supporting

confidence: 88%

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Intercritical annealing of cold-rolled ferrite-pearlite steel: Microstructure evolutions and phase transformation kinetics

et al. 2021

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The manufacturing of Dual-Phase steels includes as a crucial step the annealing of a cold-rolled ferrite-pearlite (F/P) microstructure, which involves numerous and interacting metallurgical mechanisms, namely recovery/recrystallization of ferrite, globularization, manganese enrichment, coarsening of cementite and finally austenite transformation. Present study focuses on the austenite transformation considering its interaction with the ferrite recrystallization and the influence of the chemical composition of the cementite. The behavior of a cold-rolled F/P microstructure is studied at three heating rates to induce weak and strong interactions between the mechanisms, in particular using post mortem microstructure observations but also in situ High Energy X-Ray Diffraction experiments on a synchrotron beamline. Slow heating leads to a necklace austenite distribution whereas fast heating conducts to a banded topology. This particular microstructure morphogenesis is explained by the presence of numerous intergranular (or isolated) carbides inside the ferrite matrix, inherited from the hot-rolling. Thermokinetic analysis accounting for the cementite composition shows that the pearlite islands transformation necessarily involves the partition of substitutional elements. Conversely, the dissolving isolated carbides undergo a partition/partitionless transition on heating. After the dissolution of the cementite, a final ferrite/austenite transformation takes place. The phase transformation kinetics increases with increasing heating rates, despite the thermal-activated nature of the austenite growth process. This is interpreted thanks to kinetic simulations with DICTRA software, which allow to analyze the austenite growth regimes involving or not the partition of the alloying elements.

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Section: Microstructure Evolutions During Heating To Ac1supporting

confidence: 88%

“…The isolated carbides are larger in average after slow heating than after fast heating (Table 2), because of the larger size of the carbides located at the boundaries of the recrystallized ferrite grains. More measurements can also be found in reference [74].…”

Section: Microstructure Evolutions During Heating To Ac1mentioning

confidence: 99%

Intercritical annealing of cold-rolled ferrite-pearlite steel: Microstructure evolutions and phase transformation kinetics

et al. 2021

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“…It should be noted that the average subgrain size can be calculated from the capillary coarsening effect and the stress-dependent refining effect of subgrain. Zurob et al Described the detailed calculation of average subgrain size [11,12]. In this case, the discontinuous DRX behaviors of AISI 304L austenitic stainless steel with fcc structure were performed by the phase-field model over a range of hot working parameters (temperature: 973 K to 1373 K, strain rate: 0.001/s to 3/s) and initial grain sizes (8 μm to 120 μm).…”

Section: Modelling Casesmentioning

confidence: 99%

A Mesoscopic Modelling Framework of Microstructure Evolution and its Application on Thermo-Mechanical Processes

Xiao

Sha

2021

MSF

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In present study a quantitative modelling framework based on phase-field method is developed to simulate the microstructure evolution during thermomechanical process, e. g. grain growth, recrystallization, solid phase transformations and their interactions. Two application cases of microstructure evolution are introduced. The first one is the dynamic recrystallization behavior during the hot deformation of stainless steel. The effect of thermo-mechanical parameters including strain, strain rate, and temperature on DRX have been investigated quantitatively. Moreover, the present simulation provided an explanation of the dependence of final recrystallized grain size on initial grain size when it is decreased to a critically small value. This modelling framework is also used to simulate the interaction between the dissolution of precipitates and grain coarsening of matrix in the nickel alloys. The simulation results show that the decreasing dissolution temperature of precipitate slow down the matrix coarsening kinetics obviously. This provides an quantitative tool to predict and control the local microstructure of nickel alloy disk. In summary, the mesoscopic modelling can be used to investigate more kinetic details of microstructure evolution and engineering optimization for thermo-mechanical process.

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“…Within the scope of the numerical transition of industry, steelmakers develop new modeling tools to drive their product lines [1][2][3]. Contrary to purely statistical approaches (including new machine learning capabilities), physic-based models offer additional advantages in terms of predicting ability even outside their calibration range, modularity, or possible extensions to other production steps or sites.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Phase Transformations Controlled by Interface Thermodynamic Conditions during Intercritical Annealing of Steels

Couchet

Bonnet

Teixeira

et al. 2023

Metals

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Austenite formation was numerically investigated using Thermo-Calc/DICTRA in a deformed ferrite/pearlite microstructure to produce dual-phase steels. This work aims to better understand how the interface conditions (local equilibrium with negligible partitioning—LENP—or local equilibrium with partitioning—LEP) control the austenite growth kinetics during the intercritical annealing. Inspired by our experimental observations, two nucleation sites were considered. The austenite formed from pearlite islands showed a regime transition from LENP to LEP when the holding stage started. For the growth of austenite from isolated carbides, three stages were identified during the heating stage: first, slow growth under LEP; then, fast growth under LENP; and finally, after dissolution of the carbide, slow growth again. LENP and LEP interface conditions may coexist thanks to these regime transitions. In the case of competition, LEP conditions hinder austenite growth while it is promoted by LENP interface conditions. Such differences in growth kinetics explain, in part, the morphogenesis of dual-phase microstructures.

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A Physics-Based Mean-Field Model for Ferrite Recovery and Recrystallization

Cited by 5 publications

References 35 publications

Intercritical annealing of cold-rolled ferrite-pearlite steel: Microstructure evolutions and phase transformation kinetics

Intercritical annealing of cold-rolled ferrite-pearlite steel: Microstructure evolutions and phase transformation kinetics

A Mesoscopic Modelling Framework of Microstructure Evolution and its Application on Thermo-Mechanical Processes

Numerical Investigations of Phase Transformations Controlled by Interface Thermodynamic Conditions during Intercritical Annealing of Steels

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