高温合金稀土细化剂的选择及实验研究  

Selection of Rare-Earth Refining Agents for Superalloy and Experimental Study

作　　者：赵志龙[1] 刘瑞瑞[2] 田齐[3] 

机构地区：[1]西北工业大学机电学院,陕西西安710072 [2]首都航天机械公司,北京100076 [3]中航工业西安航空发动机(集团)有限公司,陕西西安710021

出　　处：《中国稀土学报》2015年第6期712-717,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51374173)资助

摘　　要：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, densities, nearly lattice matching and so on, two kinds ofthree elements rare-earthrefining agents selection swere used as the coatingintermetallic compound of YNi2 Si2 and CeCo4 B were selected by the self-made superalloyystem. Using argon arc welding method, two kinds of rare-earth intermetallic compoundmaterial, the superalloy of K4169 was used as substrate, a common molten pool wasformed and solidified, macro/micro structure observation found that containing Ce and Y rare-earth intermetalliccompounds both have a certain inhibitory effects on the dendritic growth of substrate -phase. The experiment of di-rectly pouring the cylindric castings of K4169 superalloy at the temperature 1470 ℃ showed that the average grainsizes were reduced from 3.57 mm without any addition to 0.92 mm with addition of mixed rare-earth refining a-gents

关 键 词：稀土金属间化合物 高温合金 细化剂 

分 类 号：TG223[金属学及工艺—铸造]