Modelling the Metallurgical Reactions during Homogenisation of an AA<sub>3</sub>1O<sub>3</sub>Alloy

Hákonsen, Arild; Mortensen, Dag; Benum, Steinar; Pettersen, Tanja; Furu, Trond

doi:10.1002/9781118647783.ch130

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…Similar distribution of grain structure across the billets section has been reported previously. [21,22] It is also worth to note that the effect of casting speed on grain size is more pronounced towards to the central part of billets. This is in good agreement on our previous results.…”

Section: A Semi-horizontal Melt Feeding Scheme: Experimental and Simmentioning

confidence: 99%

Influence of Melt Feeding Scheme and Casting Parameters During Direct-Chill Casting on Microstructure of an AA7050 Billet

Zhang

Eskin

Miroux

et al. 2012

Metall Mater Trans B

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Direct-chill (DC) casting billets of an AA7050 alloy produced with different melt feeding schemes and casting speeds were examined in order to reveal the effect of these factors on the evolution of microstructure. Experimental results show that grain size is strongly influenced by the casting speed. In addition, the distribution of grain sizes across the billet diameter is mostly determined by melt feeding scheme. Grains tend to coarsen towards the center of a billet cast with the semi-horizontal melt feeding, while upon vertical melt feeding the minimum grain size was observed in the center of the billet. Computer simulations were preformed to reveal sump profiles and flow patterns during casting under different melt feeding schemes and casting speeds. The results show that solidification front and velocity distribution of the melt in the liquid and slurry zones are very different under different melt feeding scheme. The final grain structure and the grain size distribution in a DC casting billet is a result of a combination of fragmentation effects in the slurry zone and the cooling rate in the solidification range.

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Section: A Semi-horizontal Melt Feeding Scheme: Experimental and Simmentioning

confidence: 99%

Influence of Melt Feeding Scheme and Casting Parameters During Direct-Chill Casting on Microstructure of an AA7050 Billet

Zhang

Eskin

Miroux

et al. 2012

Metall Mater Trans B

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“…It has been demonstrated that these two assumptions give a reasonable description of phase diagrams in the Al rich corner [3]. Then the interfacial concentrations must fulfill the following solubility products [4]: …”

Section: Precipitation Modelmentioning

confidence: 99%

Modelling the Evolution in Microchemistry and its Effects on the Softening Behavior of Cold Rolled AlFeMnSi-Alloys during Annealing

Hersent

Huang

Friis

et al. 2013

MSF

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A dedicated diffusion controlled precipitation model for AlMnFeSi-alloys, based on classical nucleation and growth theory, has been implemented and coupled to a phenomenological softening model accounting for the combined effect of recovery and recrystallization during annealing after cold rolling. The result is a fully coupled precipitation and softening model which in principle is capable of accounting for variations in solute levels and size and volume fraction of dispersoids and their interaction with the softening behavior during annealing.

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“…Even when heterogeneous nucleation is considered in micro-macro models, grains are often considered to nucleate instantaneously at a unique temperature. We can name Håkonsen and coworkers [4], who tested different nucleation laws in their micro-macro model of DC casting and compared the model predictions with distributions of grain size measured experimentally for different TiB 2 levels. Their model assumed that the grains move at the casting velocity, which corresponds to the assumption of a coalesced solid phase, without free-floating grains.…”

Section: Introductionmentioning

confidence: 99%

Influence of transport mechanisms on nucleation and grain structure formation in DC cast aluminium alloy ingots

Bedel¹,

Založnik²,

Kumar³

et al. 2012

IOP Conf. Ser.: Mater. Sci. Eng.

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The grain structure formation in direct chill (DC) casting is directly linked to nucleation, which is generally promoted by inoculation. Inoculation prevents defects, but also modifies the physical properties by changing the microstructure. We studied the coupling of the nucleation on inoculant particles and the grain growth in the presence of melt flow induced by thermosolutal convection and of the transport of freefloating equiaxed grains. We used a volume-averaged two-phase multiscale model with a fully coupled description of phenomena on the grain scale (nucleation on grain refiner particles and grain growth) and on the product scale (macroscopic transport). The transport of inoculant particles is also modeled, which accounts for the inhomogeneous distribution of inoculant particles in the melt. The model was applied to an industrial sized (350 mm thick) DC cast aluminium alloy ingot. A discretised nuclei size distribution was defined and the impact of different macroscopic phenomena on the grain structure formation was studied: the zone and intensity of nucleation and the resulting grain size distribution. It is shown that nucleation in the presence of macroscopic transport cannot be explained only in terms of cooling rate, but variations of composition, nuclei density and grain density, all affected by transport, must be accounted for.

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Modelling the Metallurgical Reactions during Homogenisation of an AA₃1O₃Alloy

Cited by 3 publications

References 14 publications

Influence of Melt Feeding Scheme and Casting Parameters During Direct-Chill Casting on Microstructure of an AA7050 Billet

Influence of Melt Feeding Scheme and Casting Parameters During Direct-Chill Casting on Microstructure of an AA7050 Billet

Modelling the Evolution in Microchemistry and its Effects on the Softening Behavior of Cold Rolled AlFeMnSi-Alloys during Annealing

Influence of transport mechanisms on nucleation and grain structure formation in DC cast aluminium alloy ingots

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Modelling the Metallurgical Reactions during Homogenisation of an AA31O3Alloy

Cited by 3 publications

References 14 publications

Influence of Melt Feeding Scheme and Casting Parameters During Direct-Chill Casting on Microstructure of an AA7050 Billet

Influence of Melt Feeding Scheme and Casting Parameters During Direct-Chill Casting on Microstructure of an AA7050 Billet

Modelling the Evolution in Microchemistry and its Effects on the Softening Behavior of Cold Rolled AlFeMnSi-Alloys during Annealing

Influence of transport mechanisms on nucleation and grain structure formation in DC cast aluminium alloy ingots

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Modelling the Metallurgical Reactions during Homogenisation of an AA₃1O₃Alloy