Experimental Determination of Heat Transfer Within the Metal/Mold Gap in a DC Casting Mold: Part II. Effect of Casting Metal, Mold Material, and Other Casting Parameters

Prasad, Arvind; Bainbridge, I. F.

doi:10.1007/s11661-013-1646-6

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…These starting solid particles are impinged with liquid metal, leading to a coherent microstructure [1,[5][6][7][8]. The microstructure can be altered by changing the process variables.…”

Section: Process Parameters In DC Castingmentioning

confidence: 99%

See 1 more Smart Citation

Depicting Aluminium DC Casting by Means of Dimensionless Numbers

Méndez¹,

Ambriz²,

Jaramillo³

et al. 2018

Advanced Casting Technologies

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DC casting of aluminium and its alloys is a controlled heat removal solidification process. The rate of heat extraction has strong effects on the microstructure and mechanical properties of the solidified alloy ingots. In view of this strict temperature, control over the ingot as it solidifies should be implemented in order to achieve metal with the best possible properties. In situ direct temperature measurements are complicated; so in this report, the use of dimensionless analysis to predict temperature distributions on the ingots as they are casted is proposed. It is reported that the dimensionless groups that better represent the impact of process variables on the solidification of aluminium and its alloys are the Péclet (Pe) and Biot (Bi) numbers.

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“…These starting solid particles are impinged with liquid metal, leading to a coherent microstructure [1,[5][6][7][8]. The microstructure can be altered by changing the process variables.…”

Section: Process Parameters In DC Castingmentioning

confidence: 99%

“…In this regard, many studies have been conducted to have precise estimations of the heat transfer coefficients involved in cooling down the aluminium ingots [7,8,13,[31][32][33][34][35][36][37][38].…”

Section: Estimation Of the Heat Transfer Coefficientmentioning

confidence: 99%

Depicting Aluminium DC Casting by Means of Dimensionless Numbers

Méndez¹,

Ambriz²,

Jaramillo³

et al. 2018

Advanced Casting Technologies

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“…The mechanisms by which the heat is transferred through metal-mold interface have been the subject of numerous studies undertaken with a view toward modeling this phenomenon. These studies develop analytical expressions [6][7][8][9] or numerical solutions [10][11][12][13][14] to describe the interfacial heat transfer coefficient during casting solidification. On the other hand, a number of experimental investigations have been also developed in order to determine this coefficient [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Interfacial Heat Transfer Coefficient on Dendritic Growth and Microhardness during Horizontal Directional Solidification of an Aluminum-Copper Alloy

Barros

Silva

Ferreira

et al. 2016

DDF

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This paper presents a theoretical-experimental study for the prediction of the interfacial heat transfer coefficient during the horizontal directional solidification of an Al-3wt.%Cu alloy on water cooled stainless steel chill under transient heat flow conditions. Eight thermocouples were connected with the casting and the time-temperature data were recorded automatically. The thermocouples were placed at 5, 10, 15, 20, 30, 50, 70 and 90 mm from the metal-mold interface. A numerical technique which compares theoretical and experimental thermal profiles was used to measure the heat transfer coefficient values. This has permitted the evaluation of the variation of this thermal parameter along the solidification which is represented by a power equation that shows the time dependence during the process given by hi = constant (t)-n, which represents the best fit between the experimental and calculated curves. The obtained results also include the variation of both primary and secondary dendritic arm spacings of alloy analyzed as a function of heat transfer coefficient. These dendrite arm spacings were found to decrease as the values of this coefficient are increased. Finally, an experimental law of the Hall-Petch type is proposed relating the resulting microhardness to the heat transfer coefficient investigated.

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“…However, computer simulation of the casting processes in the recent years has begun to help the casting engineers in the cost and quality effective selection of design and process parameters. Most casting simulations codes up to date contain modules for heat transfer (Sully, 1976;Ho & Pehlke, 1985;Bamberger et al, 1987;Shah & Moore, 1989), fluid flow (Muller et al, 1984;Nielsen et al, 1999;Griffiths, 1996) solidification (Poirier et al, 1991;De Groh III, 1994;El-Bealy & Fredriksson, 1996;El-Bealy, 2000) and interdendritic strain analyses (Weiner & Boley, 1963;Kristiansson, 1982;El-Bealy, 2011). These codes use individually in predicting and minimising of different solidification defects and also in predicting of cast microstructure.…”

Section: Introductionmentioning

confidence: 99%

Convection Streams and Macrosegregation Couple Phenomena for Dendritic Solidification Defects in Casting Processes

El-Bealy¹

2013

JMSR

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An investigation has been performed to study the effects of convection streams and the movement of dendritic solid on the macrosegregation in equiaxed structure of aluminium cast ingots. The investigation combined laboratory work, metallographic examination and mathematical modelling. The laboratory work involved different superheats for Al-10%Si alloy cast ingots. The measurements of grain size of equiaxed crystals and macro-segregation distributions have been conducted to verify the solidification model by using the metallographic study combined macro/micro-structural evolution of cast ingot samples. Two-dimensional mathematical model of fluid flow and heat transfer has been developed to characterise the natural convection streams, thermal fields and macro-segregation distributions taken into account the effect of dendritic solid movements. The model predictions were compared to measurements of cooling curves and macro-segregation distributions where the reasonable agreements were found. The formation of macro-segregation phenomenon has been studied and discussed based on convection streams, the movements of dendritic solid and mushy permeability. Also, some typical cases in conventional casting processes related to increase the occurrence of dendritic solidification defects have been discussed.

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Experimental Determination of Heat Transfer Within the Metal/Mold Gap in a DC Casting Mold: Part II. Effect of Casting Metal, Mold Material, and Other Casting Parameters

Cited by 9 publications

References 21 publications

Depicting Aluminium DC Casting by Means of Dimensionless Numbers

Depicting Aluminium DC Casting by Means of Dimensionless Numbers

Effect of Interfacial Heat Transfer Coefficient on Dendritic Growth and Microhardness during Horizontal Directional Solidification of an Aluminum-Copper Alloy

Convection Streams and Macrosegregation Couple Phenomena for Dendritic Solidification Defects in Casting Processes

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