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Influence of direct chill casting process variables on surface quality of aluminum alloy sheet ingots
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
2012 (English)In: Light Metals 2012, John Wiley & Sons, 2012, 1107-1112 p.Conference paper (Refereed)
Abstract [en]

Surface defects formation and their effects on the surface quality of aluminum direct-chill cast sheet ingots have been investigated by metallographic examinations and mathematical modeling. The influence of process variables such as alloy composition, casting speed and lubricant on the surface defects especially extruded surface segregation layer has been determined. The metallographic study for collected samples of plant trials involved visual, micro-examinations and macrosegregation analysis. A 2-D mathematical model has been developed to characterize the thermal, solidification, interdendritic strain and macrosegregation distributions. Also, the model contained a new approach to evaluate qualitatively the macrosegregation formed during dendritic solidification. The model predications were compared to measurements from collected samples to verify the model, where a good agreement was obtained. The model predications illustrate that all the process variables tested have an observed effect on the surface quality by different levels. The mathematical analysis of strain fields as well as metallographic study has been used to explain and discuss the effects of different process variables on the surface quality.

Place, publisher, year, edition, pages
John Wiley & Sons, 2012. 1107-1112 p.
, Light Metals (Year), ISSN 0147-0809
Keyword [en]
Direct chill casting, Extruded surface segregation layer, Surface quality
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-100040DOI: 10.1002/9781118359259.ch190ScopusID: 2-s2.0-84958662150ISBN: 978-111829139-9OAI: diva2:542813
Light Metals 2012 - TMS 2012 Annual Meeting and Exhibition; Orlando, FL; 11 March 2012 through 15 March 2012

QC 20120803

Available from: 2012-08-03 Created: 2012-08-03 Last updated: 2013-09-11Bibliographically approved

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