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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of process parameters on density of magnesium alloy parts by low-pressure expendable pattern casting
LI Ji-qiang(李继强), FAN Zi-tian(樊自田), DONG Xuan-pu(董选普)

State Key Laboratory of Material Processing and Die and Mould Technology
Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:The combination of magnesium alloys with the low-pressure expendable pattern casting (LP-EPC) process would bright future for application of magnesium alloys. The researches are focused on the effect of process parameters on the internal casting quality of magnesium alloy parts. AZ91D magnesium alloy castings were produced for different combinations of the LP-EPC process parameters. Specifically, pouring temperature, vacuum, filling velocity and coupling action of these factors were manipulated to observe their effect on the casting porosity and density distribution. The results indicate that the pouring temperature with LP-EPC process is lower than it in gravity casting. The selected process parameters, such as vacuum, filling velocity and coupled modes of them, must ensure melt metal flowing front profile exhibiting smooth and convex shape. The optimal process parameters for the castings are pouring temperature 983−1 023 K, vacuum 0.02−0.03 MPa, filling velocity 60−95 mm/s, and simultaneous filling with sucking.

 

Key words: magnesium alloy; low-pressure expendable pattern casting; process parameters; density

ISSN 1672-7029
CN 43-1423/U

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