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

Wołczyński, W.; Lipnicki, Zygmunt; Bydałek, A. W.; Ivanova, А. А.

doi:10.1515/afe-2016-0067

Cited by 8 publications

(10 citation statements)

References 11 publications

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“…These are the products of the monotectic transformation taking place at the temperature of 416 °C under the conditions of thermodynamic equilibrium. Their different sizes and inhomogeneous distribution are a consequence of a coagulation effect during slow crystallization [ 24 ]. The larger surface tension of zinc, then bismuth at the same temperature and the almost lack of mutual solubility of both elements generated the observed shapes of Bi particles.…”

Section: Resultsmentioning

confidence: 99%

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Non-Equilibrium Crystallization of Monotectic Zn-25%Bi Alloy under 600 g

et al. 2021

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This study investigated the influence of supergravity on the segregation of components in the Zn–Bi monotectic system and consequently, the creation of an interface of the separation zone of both phases. The observation showed that near the separation boundary, in a very narrow area of the order of several hundred microns, all types of structures characteristic for the concentration range from 0 to 100% bismuth occurred. An additional effect of crystallization in high gravity is a high degree of structural order and an almost perfectly flat separation boundary. This is the case for both the zinc-rich zone and the bismuth-rich zone. Texture analysis revealed the existence of two privileged orientations in the zinc zone. Gravitational segregation also resulted in a strong rearrangement of the heavier bismuth to the outer end of the sample, leaving only very fine precipitates in the zinc region. For comparison, the results obtained for the crystallization under normal gravity are given. The effect of high orderliness of the structure was then absent. Despite segregation, a significant part of bismuth remained in the form of precipitates in the zinc matrix, and the separation border was shaped like a lens. The described method can be used for the production of massive bimaterials with a directed orientation of both components and a flat interface between them, such as thermo-generator elements or bimetallic electric cell parts, where the parameters (thickness) of the junction can be precisely defined at the manufacturing stage.

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Section: Resultsmentioning

confidence: 99%

“…The observed microstructure consisted of (Zn) matrix and small, spherical bismuth particles of similar size. The monotectic transformation occurring in the Zn–Bi system favors the spherical shape of the precipitates regardless of their chemical composition [ 10 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Non-Equilibrium Crystallization of Monotectic Zn-25%Bi Alloy under 600 g

et al. 2021

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“…It should be emphasized that the initial transient period of the brass ingots continuous casting follows the steel static ingot solidification to a certain extent, [4]. Fig.…”

Section: Mathematical Forecasts For Steel Static Ingotmentioning

confidence: 98%

“…It shows the liquidus isotherm velocity plotted versus time of the static ingot solidification, Fig. 1, in a simplified manner that is in such a way that the ingot shape / geometry is replaced by the roll shape, [4]. As a result, the competition / interplay between the -rate of the liquidus isotherm movement and the S -rate of the s/l interface displacement is presented / interpreted mathematically.…”

Section: Mathematical Forecasts For Steel Static Ingotmentioning

confidence: 99%

Some Similarities / Differences between Steel Static and Virtual Brass Static Casting

Kwapisiński

Ivanova

Kania

et al. 2017

Archives of Foundry Engineering

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An innovative method for determining the structural zones in the large static steel ingots has been described. It is based on the mathematical interpretation of some functions obtained due to simulation of temperature field and thermal gradient field for solidifying massive ingot. The method is associated with the extrema of an analyzed function and with its points of inflection. Particularly, the CET transformation is predicted as a time-consuming transition from the columnar-into equiaxed structure. The equations dealing with heat transfer balance for the continuous casting are presented and used for the simulation of temperature field in the solidifying virtual static brass ingot. The developed method for the prediction of structural zones formation is applied to determine these zones in the solidifying brass static ingot. Some differences / similarities between structure formation during solidification of the steel static ingot and virtual brass static ingot are studied. The developed method allows to predict the following structural zones: fine columnar grains zone, (FC), columnar grains zone, (C), equiaxed grains zone, (E). The FCCT-transformation and CET-transformation are forecast as sharp transitions of the analyzed structures. Similarities between steel static ingot morphology and that predicted for the virtual brass static ingot are described.

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“…It should be emphasized that the initial transient period of the ingots continuous casting follows the static ingot solidification to some extent as described in details, [6].…”

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

Cited by 8 publications

References 11 publications

Non-Equilibrium Crystallization of Monotectic Zn-25%Bi Alloy under 600 g

Non-Equilibrium Crystallization of Monotectic Zn-25%Bi Alloy under 600 g

Some Similarities / Differences between Steel Static and Virtual Brass Static Casting

Structural Transformations Versus Hard Particles Motion in the Brass Ingots

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