CRITICAL GATE VELOCITY IN CASTING MAGNESIUM ALLOYS

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MIRAK A.R.; DIVANDARI M.; BOUTORABI S.M.A.

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Paper Information

Journal: AMIRKABIR Year:2007 | Volume:18 | Issue:66-C Page(s): 65-72

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Information Journal Paper

Title

CRITICAL GATE VELOCITY IN CASTING MAGNESIUM ALLOYS

Author(s)

MIRAK A.R. | DIVANDARI M. | BOUTORABI S.M.A. | Issue Writer Certificate

Keywords

CRITICAL VELOCITYQ2

MAGNESIUM ALLOYQ1

MECHANICAL PROPERTIESQ3

OXIDE FILM DEFECTSQ3

Abstract

The concept of critical gate entry velocity was investigated in AZ91 MAGNESIUM ALLOY. The effect of in-gate velocity on the soundness and the MECHANICAL PROPERTIES of aluminum castings has been reported. Due to surface turbulence resulted by exceeding from the CRITICAL VELOCITY and the entrainment of oxide film, MECHANICAL PROPERTIES and the performance of casting might be reduced significantly. Experimental work consisted of casting of plates, 10x140x200 mm of the AZ91 alloy in resin sand mold. The molten metal was introduced into the mold cavity at different gate velocities via changing the dimensions of a bottom gated filling system. Video recording was used to evaluate the possibility of the surface turbulence and the direct observation of the morphology of entrance of the melt jetted into the mold cavity at different velocities. Bend tests were carried out to investigate the effect of gate velocity on the MECHANICAL PROPERTIES of the castings in vertical and horizontal directions. Some results indicated that critical in-gate velocity for alloys is approximately 0.3m/s. Laminar fluid flow was observed at and below this velocity while at higher speed the morphology was changed into a mushroom shape and fountain shape of flow was noticed followed by about 50% decreased in the MECHANICAL PROPERTIES.

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APA: Copy

MIRAK, A.R., DIVANDARI, M., & BOUTORABI, S.M.A.. (2007). CRITICAL GATE VELOCITY IN CASTING MAGNESIUM ALLOYS. AMIRKABIR, 18(66-C), 65-72. SID. https://sid.ir/paper/929/en

Vancouver: Copy

MIRAK A.R., DIVANDARI M., BOUTORABI S.M.A.. CRITICAL GATE VELOCITY IN CASTING MAGNESIUM ALLOYS. AMIRKABIR[Internet]. 2007;18(66-C):65-72. Available from: https://sid.ir/paper/929/en

IEEE: Copy

A.R. MIRAK, M. DIVANDARI, and S.M.A. BOUTORABI, “CRITICAL GATE VELOCITY IN CASTING MAGNESIUM ALLOYS,” AMIRKABIR, vol. 18, no. 66-C, pp. 65–72, 2007, [Online]. Available: https://sid.ir/paper/929/en

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