Zr在K4169合金凝固过程中作用的研究  

Effects of Zr in Solidification Process of K4169 Superalloy

作　　者：李亚敏[1] 陈毅[1] 郝远[1] 

机构地区：[1]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2012年第11期31-34,共4页Hot Working Technology

基　　金：甘肃省自然科学基金项目(3ZS042-B25-028)

摘　　要：利用手工电弧炉熔炼制备了Zr质量分数为0.00%～0.07%的K4169合金,采用金相显微镜、扫描电镜、能谱仪以及差热分析对合金的凝固组织、元素偏析及熔点进行了研究。结果表明,Zr的加入促进了合金中Nb、Mo、Ti等元素的偏析,使铸态合金晶界析出的Laves相和碳化物数量增多,但随着Zr含量的增加Laves相又有所减少。Zr的加入提高了Laves相初熔温度,降低了合金的熔点。另外,微量Zr对K4169合金的凝固组织不利。A manual electric arc furnace was used for preparing K4169 superalloy with different Zr content up to 0.07%（mass percentage content）.The solidification structure,segregation and the melting point were observed by OM,SEM,SEM-EDS and DSC.The results show that Zr has strong grain boundary segregation tendency,and Zr can promote the segregation of Nb,Mo and Ti,meanwhile,Zr can significantly promote the precipitation of Laves phase and MC carbide at the grain boundaries.However,the amount of Laves phase decreases with the content of Zr increasing.In the meantime,the incipient melting temperature of Laves phase greatly increases,but the melting point of the alloy decreases with the addition of Zr.The analysis shows that the content of Zr is harmful to the solidification microstructure of K4169 superalloy.

关 键 词：K4169合金 锆 凝固组织 元素偏析 LAVES相 

分 类 号：TG132.3[一般工业技术—材料科学与工程]