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依据高熔点、密度相近和晶格匹配等原则,利用自编高温合金细化剂选取系统,分别甄选出YNi_2Si_2和CeCo_4B两种三元稀土金属间化合物。采用氩弧熔敷的方法,两种稀土金属间化合物分别作为敷材,K4169高温合金作为基材,形成公共熔池并凝固,组织观察发现含Ce和含Y稀土金属间化合物均对基材γ相枝晶生长具有一定的抑制作用;直接浇注试棒铸件实验表明:采用混合稀土细化剂,1470℃浇注,K4169高温合金试样平均晶粒组织由未添加细化剂的3.57 mm降为添加细化剂的0.92 mm。
Based on the principles of high melting point, similar density and lattice matching, the system of selecting the superalloy refiner was selected, and two kinds of ternary rare earth intermetallic compounds YNi_2Si_2 and CeCo_4B were selected respectively. Using argon arc welding method, two kinds of rare earth intermetallic compounds were used as the dressing, K4169 superalloy as the substrate, forming a common pool and solidified, the organization observed found that both Ce and Y-containing rare earth intermetallic compounds of the substrate γ Dendritic growth has a certain inhibition; direct casting test castings showed: the use of mixed rare earth refiner, pouring 1470 ℃, K4169 superalloy sample average grain structure without adding refiner 3.57 mm reduced to add Refiner 0.92 mm.