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Microstructural Studies of A357 Alloy Cast By RSF Process

Ratke, Lorenz und Sharma, Ashok (2009) Microstructural Studies of A357 Alloy Cast By RSF Process. Transactions of the Indian Institute of Metals, 62 (4-5), Seiten 327-330. Springer. ISSN 0972-2815.

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Kurzfassung

We studied rheocasting of an A357 ( Al-7Si-0.6Mg ) alloy using the Rapid Slurry Formation (RSF) technology developed by Rheometal. The technology is based on a so-called solid enthalpy exchange material (EEM). A cold piece of the same material is immersed into a melt bath and stirred in the melt which subsequently melts during stirring operation. This leads to a temperature reduction of the melt bath within a minute to a preset value between solidus and liquidus temperature at an also preset amount of fraction solid. Semi-solid slurries of A357 with around 30% solid fraction were produced in this way. The slurry formation was modified by adding several grain refiners ( Al-5Ti-1B, Al-3Ti-0.15C and Si-1B master alloys). Grain refiners were added individually a few minutes before start of the RSF process. Stirring speed was varied to study its effect on microstructure. The slurry so produced was quenched in water or cast into a heated stainless steel ring and compacted by a mild squeezing into a disc. The microstructures are analyzed with respect to grain size, grain density, aspect ratio and homogeneity, revealing an additional effect of grain refiners. The results are discussed with models of nucleation, growth and flow assisted coarsening.

Dokumentart:Zeitschriftenbeitrag
Titel:Microstructural Studies of A357 Alloy Cast By RSF Process
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ratke, LorenzLorenz.ratke@dlr.de
Sharma, Ashokashok.mnit12@gmail.com
Datum:November 2009
Erschienen in:Transactions of the Indian Institute of Metals
Referierte Publikation:Ja
In SCOPUS:Nein
In ISI Web of Science:Ja
Band:62
Seitenbereich:Seiten 327-330
Verlag:Springer
ISSN:0972-2815
Status:veröffentlicht
Stichwörter:semi-solid, RSF, A357, grain refiner, microstructure
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - Multi Material Design Strukturen (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum
Hinterlegt von: Prof. Lorenz Ratke
Hinterlegt am:25 Nov 2009 10:48
Letzte Änderung:26 Feb 2013 15:02

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