Columnar-to-Equiaxed Transition in Solidification Processing of AlSi7 Alloys in Microgravity the CETSOL Project

Zimmermann, G.; Sturz, Laszlo; Billia, B.; Mangelinck‐Noël, Nathalie; Liu, Dong-Rong; Thi, H. Nguyen; Bergeon, N.; Gandin, Charles‐André; Browne, David J.; Beckermann, C.; Tourret, Damien; Karma, Alain

doi:10.4028/www.scientific.net/msf.790-791.12

Cited by 18 publications

(25 citation statements)

References 27 publications

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“…We expect the DNN model and its extensions to yield deeper insight into microstructure selection at an intermediate scale between phasefield and volume-averaged grain dynamics models, for instance, exploring the fundamental mechanisms of polycrystalline grain growth competition, 16 the influence of convective transport at the scale of extended dendritic arrays, 50 or the columnar-to-equiaxed transition. 51 …”

Section: Resultsmentioning

confidence: 99%

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

Tourret

Clarke

Imhoff

et al. 2015

JOM

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We present a three-dimensional extension of the multiscale dendritic needle network (DNN) model. This approach enables quantitative simulations of the unsteady dynamics of complex hierarchical networks in spatially extended dendritic arrays. We apply the model to directional solidification of Al-9.8 wt.%Si alloy and directly compare the model predictions with measurements from experiments with in situ x-ray imaging. We focus on the dynamical selection of primary spacings over a range of growth velocities, and the influence of sample geometry on the selection of spacings. Simulation results show good agreement with experiments. The computationally efficient DNN model opens new avenues for investigating the dynamics of large dendritic arrays at scales relevant to solidification experiments and processes.

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Section: Resultsmentioning

confidence: 99%

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

Tourret

Clarke

Imhoff

et al. 2015

JOM

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“…This is time consuming transition (CET) within which a competition between columnar and equiaxed structure formation occurs, [13]. Therefore, at some ingot radius the coexistence of columnar and equiaxed grains is expected, Fig.…”

Section: Visualization Of a Static Ingot's Zonesmentioning

confidence: 99%

“…However, the structural zones in the solidifying ingot are formed as a result of the constrained or unconstrained solidification, [3]- [7]. Consequentially, the temperature field in the ingot can be subjected to the detailed analysis, [8]- [13].…”

Section: Introductionmentioning

confidence: 99%

Structural Zones in Large Static Ingot. Forecasts for Continuously Cast Brass Ingot

Wołczyński¹,

Lipnicki²,

Bydałek³

et al. 2016

Archives of Foundry Engineering

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Some metallographic studies performed on the basis of the massive forging steel static ingot, on its cross-section, allowed to reveal the following morphological zones: a/ columnar grains (treated as the austenite single crystals), b/ columnar into equiaxed grains transformation, c/ equiaxed grains at the ingot axis. These zones are reproduced theoretically by the numerical simulation. The simulation was based on the calculation of both temperature field in the solidifying large steel ingot and thermal gradient field obtained for the same boundary conditions. The detailed analysis of the velocity of the liquidus isotherm movement shows that the zone of columnar grains begins to disappear at the first point of inflection and the equiaxed grains are formed exclusively at the second point of inflection of the analyzed curve. In the case of the continuously cast brass ingots three different morphologies are revealed: a/ columnar structure, b/ columnar and equiaxed structure with the CET, and c/ columnar structure with the single crystal formation at the ingot axis. Some forecasts of the temperature field are proposed for these three revealed morphologies. An analysis / forecast of the behavior of the operating point in the mold is delivered for the continuously cast ingot. A characteristic delay between some points of breakage of the temperature profile recorded at the operating point and analogous phenomena in the solidifying alloy is postulated.

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“…Not every structural zone observed in the steel static ingots, [1,7,9,11,14,20,[22][23][24][25]27,29,30,32], can be revealed in the continuously cast brass ingots. Moreover, some of them cannot be formed since the brass ingots do not contain relevant additions (apart from the hard particles).…”

Section: Mathematical Prediction Of Structural Transformationsmentioning

confidence: 99%

Structural Transformations Versus Hard Particles Motion in the Brass Ingots

Wołczyński

Ivanova

Kwapisiński

et al. 2017

Archives of Metallurgy and Materials

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A mathematical method for the forecast of the type of structure in the steel static ingot has been recently developed. Currently, the method has been applied to structural zones prediction in the brass ingots obtained by the continuous casting. Both the temperature field and thermal gradient field have been calculated in order to predict mathematically the existence of some structural zones in the solidifying brass ingot. Particularly, the velocity of the liquidus isotherm movement and thermal gradient behavior versus solidification time have been considered. The analysis of the mentioned velocity allows the conclusion that the brass ingots can evince: chilled columnar grains-, (CC), fine columnar grains-, (FC), columnar grains-, (C), equiaxed grains zone, (E), and even the single crystal, (SC), situated axially. The role of the mentioned morphologies is analyzed to decide whether the hard particles existing in the brass ingots can be swallowed or rejected by the solid / liquid (s/l) interface of a given type of the growing grains. It is suggested that the columnar grains push the hard particles to the end of a brass ingot during its continuous casting.

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Columnar-to-Equiaxed Transition in Solidification Processing of AlSi7 Alloys in Microgravity the CETSOL Project

Cited by 18 publications

References 27 publications

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

Three-Dimensional Multiscale Modeling of Dendritic Spacing Selection During Al-Si Directional Solidification

Structural Zones in Large Static Ingot. Forecasts for Continuously Cast Brass Ingot

Structural Transformations Versus Hard Particles Motion in the Brass Ingots

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