Effect of cobalt on solidification microstructure and segregation of K4169 superalloy

	Effect of cobalt on solidification microstructure and segregation of K4169 superalloy
	Li, Ya-Min; Liu, Hong-Jun; Liu, Jie; An, Bei; Hao, Yuan
刊名	Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology
	2010-08-01
卷号	32 期号:4 页码:385-389
关键词	Cobalt Electric arcs Electric furnaces Microstructure Morphology Niobium Segregation (metallography) Solidification Solubility Superalloys Cobalt content Electric arc furnace Interdendritic segregation Laves-phase Mesh structures SEM observation Solidification microstructures Solidification process
ISSN号	10001646
英文摘要	In order to investigate the effect of cobalt on the solidification process of K4169 superalloy, a manual electric arc furnace was used for preparing the superalloy with different cobalt content from 0.5% to 0.8%. The solidification microstructure and segregation were observed by SEM, EDS and EPMA. The results of SEM observation show that cobalt significantly promotes the formation of Laves phase and reduces the interdendritic segregation area. With increasing the Co content from 0.5% to 0.8%, the morphology of Laves phase changes from small block shape to mesh structure, and the amount of Laves phase increases considerably. The EDS and EPMA analyses show that cobalt can lower the solubility of Nb in the matrix. At the same time, cobalt can decrease the solubility of Fe and Cr in Laves phase, while increase the solubility of Nb, Mo and Ti in Laves phase. Therefore, it can be thought that cobalt promotes the precipitation of Laves phase. The analysis shows that the excessive increase of the Co content has little effect in improving the solidification microstructure of the K4169 alloy.
语种	中文
出版者	Shenyang University of Technology
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/111499]
专题	材料科学与工程学院国际教育学院
作者单位	Key Laboratory of Non-Ferrous Metal Alloys and Processing of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China
推荐引用方式 GB/T 7714	Li, Ya-Min,Liu, Hong-Jun,Liu, Jie,et al. Effect of cobalt on solidification microstructure and segregation of K4169 superalloy[J]. Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology,2010,32(4):385-389.
APA	Li, Ya-Min,Liu, Hong-Jun,Liu, Jie,An, Bei,&Hao, Yuan.(2010).Effect of cobalt on solidification microstructure and segregation of K4169 superalloy.Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology,32(4),385-389.
MLA	Li, Ya-Min,et al."Effect of cobalt on solidification microstructure and segregation of K4169 superalloy".Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology 32.4(2010):385-389.