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Aluminium-silicon castings are typically produced by gravity casting. Bottom gated systems are usually required if surface turbulence is to be eliminated. Latest research has demonstrated, that for every liquid metal there is critical velocity above which the surface will fold over and entrain itself in the bulk of the metal. Therefore the strength properties the aluminium castings are largely determined by microstructural defects, particularly pores and oxide films which are created by surface turbulence. The purpose of this paper is to investigate tensile properties and microstructure of aluminium alloy in a casted state two different designs of gating system. The first is the usual bottom gating system and the second is novel design of gating system named a vortex-gate introduced by Campbell [1]. The results of the mechanical tests revealed that there is a small improvement in ultimate tensile strength for vortex-gate design of pouring system. The oxide film defects were observed in microstructure of a sample taken from poured casting by using the bottom gated system.
Czasopismo
Rocznik
Strony
117--120
Opis fizyczny
Bibliogr. 16 poz., rys., tab., wykr.
Twórcy
autor
- Department of Technology and Materials, Alexander Dubček University of Trenčín in Trenčín , Študentská 1, 911 50 Trenčín, Slovak Republic
autor
- Department of Technology and Materials, Alexander Dubček University of Trenčín in Trenčín , Študentská 1, 911 50 Trenčín, Slovak Republic
autor
- Faculty of Materials Science an Technology in Trnava, Slovak University of Technology in Bratislava, Paulínska 16, 91724 Trnava, Slovak Republic
Bibliografia
- [1] Campbell, J., Casting Practice, The 10 Rules of Castings, Elsevier Butterworth Heinemann, Oxford, 2004.
- [2] Orłowicz W., Mróz M.: Wskaźnik jakości odlewów ze stopu Al-Si. Archiwum Odlewnictwa, 2004, t. 4, z.14, p. 363-368.
- [3] Barto M., Vasková I., Chyby odliatkov zo zliatin hliníka (Casting defects in aluminium alloys), Metalurgia Junior 2006, zborník prednášok z konferencie, Herľany, 24-25. máj 2006. Košice, TU, 2006. p. 14-17.
- [4] Akhtar S., Dispinar D., Arnberg L., Sabatino M.Di., Effect of hydrogen content, melt cleanliness and solidifications conditions on tensile properties of A356 alloy, International Journal of Cast Metals Research, 22, No 1-4, 2009, p. 22-25.
- [5] Chaus A., Sokolov J., Sadocha A.M., Baček I.A., Udalenie rastvorennych gazov iz aljuminievych splavov (Taking out a dissolved gas from aluminium alloys), Research papers at Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, No. 22, 2007, p. 47-54.
- [6] Barto M., Vasková I., Decreasing of hydrogen content in aluminium, Metalurgija. Vol. 45, no. 3, 2006, p. 230.
- [7] Djurdjevic M., Pavlović J., Byczynski G., The impact of major alloying elements and refiner on the SDAS of Al-Si-Cu alloy, Praktische Metallographie, 46, 2009, p. 97-114.
- [8] Mróz M., Orłowicz W., Tupaj M.: Geometria nadtopień i struktura uszlachetnionych powierzchniowo odlewów z nadeutektycznego stopu Al-Si. Archiwum odlewnictwa, 2005, vol. 17, str. 209-215.
- [9] Dash M., Makhlouf M., Effect of key alloying elements on the feeding characteristics of aluminum–silicon casting alloys, Journal of Light Metals, 1, 2001, p. 251–265.
- [10] Pavlovic-Krstić J., Bähr R., Krstic G., Putic S., The effect of mould temperature and cooling conditions on the secondary dendrite arm spacing in AlSi7Cu3 alloy, Metalurgija-Journal of Metallurgy, Vol 15 No 2, 2009, p. 105-113.
- [11] Orłowicz W., Mróz M.: Microstructure and fatique strength of A 356 alloy castings refined on the surface by rapid crystalization. Zeitschrift fűr Metallkunde, 2003, vol. 94, n.12, p. 1320-1326.
- [12] Ma Z., Samuel A.M., Samuel F.H., Doty H.W., Valtierra S., A study of tensile properties in Al–Si–Cu and Al–Si–Mg alloys: Effect of β -iron intermetallics and porosity, Materials Science and Engineering A, 490, 2008, p. 36–51.
- [13] Campbell, J., Castings, Butterworth Heinemann, Oxford, 2003.
- [14] Runyoro, J., Boutorabi S.M.A., Campbell, J., Critical gate velocities for film-forming casting alloys: a basis for process specification, AFS Transactions, Vol. 100, 1992, p. 225-234.
- [15] Wang Q.G., Davidson C.J., Griffiths J.R., Crepeau P.N.: Oxide Films, Pores and the Fatigue Lives of Cast Aluminum Alloys. Metallurgical and Materials Transactions B, Volume 37B, 2006, p.887-895.
- [16] Hsu, F.Y.; Jolly, M. R., Campbell, J., Vortex-gate design for gravity casting. International Journal of Cast Metals Research, Vol 19, No 1, 2006, p. 38-44.
Typ dokumentu
Bibliografia
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