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Modeling of Heat Transfer and Interdendritic Strain for Exuded Surface Segregation Layer in the Direct Chill Casting of Aluminum Alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2016 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 47, no 1, 630-648 p.Article in journal (Refereed) PublishedText
Abstract [en]

This investigation on the formation of exuded surface segregation layer "ESSL" is intended to provide experimental and simulated comparison to verify the model developed previously by El-Bealy. Preliminary verification and calibration of the previous 2D mathematical model are demonstrated by quantitative errors between the previous measurements and predictions of temperature and macrosegregation. Also, the results from these comparisons reveal that the errors are in the reasonable and within allowable limits. These comparisons lead to the fact that the exuded surface segregation layer mostly forms on the middle slice of broad sheet ingot face and in the early stages of mold zone. The model predictions point out also that the different interdendritic strain hypotheses associated with fluctuations of mold cooling conditions. This affects the interdendritic liquid flow between the equiaxed crystals which influences the severity of ESSL formation and its macrosegregation level. The mechanism of ESSL with heat flow and interdendritic strain generation has been analyzed and discussed. The quantitative comparisons between the pervious experimental results and numerical simulation in this investigation reveal also several solutions to prevent this defect for future work.

Place, publisher, year, edition, pages
2016. Vol. 47, no 1, 630-648 p.
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-182777DOI: 10.1007/s11663-015-0513-9ISI: 000368692300055ScopusID: 2-s2.0-84958156012OAI: diva2:906064

QC 20160223

Available from: 2016-02-23 Created: 2016-02-23 Last updated: 2016-02-23Bibliographically approved

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El-Bealy, Mostafa Omar
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