Altering the Microstructure Morphology by Ultrasound Melt Processing During 6XXX Aluminium DC-Casting
| Autor: | G. Salloum-Abou-Jaoude, Philippe Jarry, M. Jarrett, G S B Lebon, Dmitry G. Eskin, C. Barbatti |
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| Rok vydání: | 2019 |
| Předmět: |
6XXX series aluminium alloys
Natural convection Sonotrode Materials science business.industry Acoustic cavitation Ultrasound Dendritic morphology chemistry.chemical_element Microstructure DC casting Grain size Ultrasonic processing Grain growth chemistry Numerical modelling Aluminium Ultrasonic sensor Composite material business Grain refinement |
| Zdroj: | Light Metals 2019 ISBN: 9783030058630 TMS 2019 Annual Meeting & Exhibition |
| DOI: | 10.1007/978-3-030-05864-7_203 |
| Popis: | In this work, we have introduced power ultrasound in the sump during hot-top DC casting of 152 mm O billets to influence the aluminium grain growth morphology. Grains in the central part of the billet are highly dendritic and elongated towards the sonotrode position in the sump. We suggest that ultrasound generates acoustic flow in the sump counteracting natural convection, thereby affecting the direction of grain growth; this is supported by numerical modelling. We found that macrosegregation can be decreased by tuning the position of the sonotrode in the sump and the ultrasonic power. Apart from the central part of the billet, the grain size was found to be significantly refined compared with the reference cast. This could be an effect of forced dendritic fragmentation by ultrasonic melt processing. |
| Databáze: | OpenAIRE |
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