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Modelling of heat flow and interdendritic crack formation in twin-roll strip casting of aluminium alloys
2016 (English)In: Canadian metallurgical quarterly, ISSN 0008-4433, E-ISSN 1879-1395, Vol. 55, no 1, 23-44 p.Article in journal (Refereed) PublishedText
Abstract [en]

Preliminary mathematical analyses of different interdendritic cracks associated with variation of heat transfer and generation of interdendritic strain in horizontal twin-roll strip casting have been investigated. A 1-D transient finite difference model of heat flow, dendritic solidification and interdendritic thermo-metallurgical strain has been developed. The model contains two cracking criteria to predict qualitatively and quantitatively the tendency of interdendritic crack formation during dendritic solidification of pure aluminium and 6022 aluminium alloy. The model predictions are compared to available analytical methods and previous measurements. This is to verify and calibrate the model where good and reasonable agreements are obtained, respectively. The variations of heat transfer modes during different contact cooling zones and their effects on the generation of interdendritic thermo-metallurgical strain at the surface and central strip locations have been analysed. The model predictions point out that the different contact cooling zones of strip surface and surroundings control the stages of interdendritic crack formation in different mushy regions. The mechanism of interdendritic crack formation in twin-roll strip casting process with previous and present cracking criteria have been explained and discussed. These discussions show the importance of selection of mathematical treatment to predict the stages of interdendritic crack formation. 

Place, publisher, year, edition, pages
Maney Publishing , 2016. Vol. 55, no 1, 23-44 p.
Keyword [en]
Heat flow and Aluminium alloys, Interdendritic crack formation, Interdendritic thermo-metallurgical strain, Twin-Roll strip casting, Aluminum, Cracks, Forecasting, Heat transfer, Metallurgy, Solidification, Strain, Strip metal, Analytical method, Cracking criteria, Dendritic solidification, Finite difference model, Mathematical analysis, Mathematical treatments, Model prediction, Aluminum alloys
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-186759DOI: 10.1080/00084433.2015.1118841ISI: 000374590700003ScopusID: 2-s2.0-84964556142OAI: oai:DiVA.org:kth-186759DiVA: diva2:929908
Note

QC 20160520

Available from: 2016-05-20 Created: 2016-05-13 Last updated: 2016-06-08Bibliographically approved

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El-Bealy, Mostafa Omar
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