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目前人们十分重视对高温合金叶片定向凝固的研究,但对铝合金铸件定向凝固的研究和应用却比较少。本文研究了铝合金长铸件定向凝固工艺,并籍此了解定向凝固工艺的一般规律。在定向凝固条件下,通过改变浇注温度、铸型预热温度、铸型下降速度和冷却条件(水冷铜结晶器的通水量)等四个铸造工艺因素,研究这些工艺因素与凝固参数;凝固参数与铸件组织、性能的关系。选用典型的宽结晶温度范围的合金—Al-4.5％Cu,在自制的定向装置上,分别用精铸型壳和保温材料做铸型,采用正交设计方法。此外,还对生产上常用的ZL—105合金,作了定向凝固条件下的机械性能试验。
At present, people attach great importance to the directional solidification of the superalloy leaves, but the research and application of the directional solidification of the aluminum alloy castings are relatively few. In this paper, the directional solidification process of aluminum alloy long castings is studied and the general rule of directional solidification process is learned. Under the conditions of directional solidification, these factors and solidification parameters were studied by changing the casting temperature, the preheating temperature of the mold, the falling speed of the mold and the cooling conditions (the water flow of the water cooled copper mold). The solidification parameters Relationship with casting organization and performance. Select the typical wide temperature range of the alloy -Al-4.5% Cu, homemade orientation device, respectively, with casting shell and insulation material as a mold, the use of orthogonal design. In addition, the production of the commonly used ZL-105 alloy, made under the direction of the solidification conditions of the mechanical properties test.