金属型铸造高压壳体铸件中气孔的形成分析
Analysis of Gas Holes Formation in High Pressure Shells Under Metal-mould Casting
黄立国， 付大军
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作者单位：（辽宁工程技术大学 材料科学与工程学院，辽宁 阜新 123000）
中文关键字： 金属型铸造； 表面气孔； 内部气孔
英文关键字：metal-mould casting; surface holes; deep-seated blowholes
中文摘要：通过实验研究了金属型铸造高压壳体铸件中气孔的形成原因。通过检测发现，铸件的表面和内部都存在气孔。分析表明，铸件的表面气孔是由于涂料的发气造成的；内部气孔是由于铝液的含气量过高造成的。气孔形态表现为析出性气孔和侵入性气孔。因此，要加强铝液的除气和净化工艺，以消除铸件中的气孔。
英文摘要：The reason for forming gas holes in high pressure shells was experimentally studied under metal-mould casting. The results show that there are gas holes in the surface and the casting; the surface holes are caused by forming gas in coatings, and the deep-seated blowholes are due to excessive gas content of liquid-Al. The morphology of gas holes has two forms: precipitating gas holes and irruptive gas holes. Consequently, the degassing and purification process for liquid-Al should be improved in order to eliminate gas holes.