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Study on the Cavity Defects of Low-Pressure Lost Foam Casting for Magnesium Alloy

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Abstract:

Cavity defects of low-pressure lost foam casting (LP-LFC) for magnesium alloy were investigated by using ladder samples and claviform samples.The physical feature of typical cavity defects of LP-LFC for magnesium castings had been tested by optical microscopy and scanning electron microscopy. And the chemical constitution of cavity surface was also tseted by energy spectrometer. The result indicated that the cluster cavity defects were formed with the application of higher vacuum at the metal-mold interface, which caused the liquid-EPS residue in the castings. Some irregular shape cavity defects were caused by slag entrapment or coating slough. These cavity defects could be avoided through reducing pouring temperature, filling velocity and vacuum level, improving the permeability of coating.

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Periodical:

Applied Mechanics and Materials (Volumes 201-202)

Pages:

1151-1154

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.201-202.1151

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Online since:

October 2012

Authors:

Ji Qiang Li, Zhong Zhao, Zhi Xin Jia, Yun Wei Xu, Zhi Yuan Liu

Keywords:

Cavity Defects, Genetic Analysis, Low-Pressure Lost Foam Casting, Magnesium

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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