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研究了电磁搅拌对Incoloy825高温合金凝固组织及凝固过程中溶质元素偏析的影响。结果表明,在合金凝固过程中,施加电磁搅拌能够有效细化晶粒组织,同时增加等轴晶比例。当电磁搅拌电流强度由150A增加到300A时,铸坯中晶粒尺寸由300μm减小至210μm,同时等轴晶含量由66.7%增至77.5%。未施加电磁搅拌的Incoloy825高温合金铸坯内部的宏观偏析和微观偏析均比较严重,通过施加电磁搅拌,引起熔体强制对流,使熔体内部传热和传质得到改善,同时增大了冷却速率使二次枝晶臂间距减小,并促进液穴内熔体成分的均匀化,大幅度降低了合金元素的偏析程度。
The effect of electromagnetic stirring on the solidification microstructure and segregation of solute elements in Incoloy825 superalloy was studied. The results show that the electromagnetic stirring can effectively refine the grain structure and increase the equiaxed grain ratio during the solidification of the alloy. When the current intensity of electromagnetic stirring is increased from 150A to 300A, the grain size decreases from 300μm to 210μm and the content of equiaxed grains increases from 66.7% to 77.5%. Macro-segregation and microsegregation inside Incoloy825 superalloy without any electromagnetic stirring are all serious. By applying electromagnetic stirring, the melt convection forced to improve the heat transfer and mass transfer in the melt, meanwhile, the cooling rate So that the secondary dendrite arm spacing decreases, and to promote the homogenization of melt components in the liquid hole, greatly reducing the degree of segregation of alloying elements.