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针对定向凝固过程中高压涡轮导向叶片存在沿柱状晶晶界开裂的现象,分析了高温合金柱状晶凝固收缩机理及材料成分对热裂倾向的影响,并对陶瓷型芯高温形变、陶瓷型芯对金属收缩的阻碍等进行了分析。结果发现,定向凝固柱状晶晶界裂纹与晶界结构、合金收缩受阻、陶瓷型芯的形变与漂移有一定的关系。通过采取调整叶型壁厚、陶瓷型芯定位、调整材料成分等措施来抑制定向凝固叶片沿晶界开裂的倾向。
In view of the phenomenon that the high-pressure turbine guide vane cracks along the columnar grain boundaries during directional solidification, the mechanism of solidification and shrinkage of the columnar grains and the influence of material composition on the tendency of hot cracking are analyzed. The effects of high temperature deformation of ceramic core, Metal shrinkage and other obstacles were analyzed. The results show that there is a certain relationship between the columnar grain boundary crack and the grain boundary structure, the shrinkage of the alloy and the deformation and drift of the ceramic core. By adjusting the leaf wall thickness, ceramic core positioning, adjust the material composition and other measures to inhibit the directional solidification blade along the grain boundary cracking tendency.