Effect of process parameters on density of magnesium alloy parts by low-pressure expendable pattern casting

来源期刊:中国有色金属学报(英文版)2007年增刊第1期

论文作者:李继强 樊自田 董选普

文章页码:358 - 362

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

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.

基金信息:the National Natural Science Foundation of China

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