Effect of cobalt on the precipitation of Laves, gamma ' and gamma '' phases in a 718 base alloy with 1.2 wt.% Al

doi:10.1016/j.jmrt.2021.10.068

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	Effect of cobalt on the precipitation of Laves, gamma ' and gamma '' phases in a 718 base alloy with 1.2 wt.% Al
	Yao, Xiaoyu 1,2; Liu, Fang 2; Yang, Shulin 3; Liu, Dongyan 2; Jia, Dan 2; Sun, Wenru 2
刊名	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
	2021-11-01
卷号	15 页码:4427-4436
关键词	Alloy 718 Cobalt Laves gamma '' phase gamma ' phase
ISSN号	2238-7854
DOI	10.1016/j.jmrt.2021.10.068
通讯作者	Liu, Fang(fangliu@imr.ac.cn) ; Sun, Wenru(wrsun@imr.ac.cn)
英文摘要	Cobalt is an important strengthening element in superalloys, but its effect on 718 alloy family has rarely been studied and reported, and it is difficult to understand the controversy policy for controlling the Co content in the alloys such as 718 and 718 Plus. Therefore, the function of Co on the precipitation of 718 family alloy has been investigated in a reference alloy, in which 1.2 wt.% Al was added into the 718 base composition for raising the sensitivity of precipitation to the composition variation. It was found that the Co additions favored the intergranular Laves precipitation and refined the grains. The thermo-dynamic calculation showed that the range of the precipitation temperature was enlarged by the Co additions, and the peak temperature of the Laves precipitation was located around 980 degrees C. Unexpectedly, the Co addition increased the volume fraction of gamma ' while decreased the volume fraction of gamma '' precipitations. It was revealed by analyzing the distribution of elements in the microstructures of the as cast experimental alloys that the Co addition increased the solubility of Nb while hardly changed the solubility of Al in the Upsilon matrix. It is apparent that the Co addition influenced the precipitations of gamma '-Ni3Al and y ''-Ni3Nb by affecting the solubility of Al and Nb in the Upsilon matrix and the precipitates of Nb-rich and Al-poor Laves phase. Accordingly, the controlling policy of Co content in alloys 718 and 718 Plus is discussed in the text. (C) 2021 The Author(s). Published by Elsevier B.V.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000717664500008
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/167389]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liu, Fang; Sun, Wenru
作者单位	1.Univ Sci & Technol China, Coll Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.Shenyang Liming Aero Engine Co Ltd, Shenyang 110043, Peoples R China
推荐引用方式 GB/T 7714	Yao, Xiaoyu,Liu, Fang,Yang, Shulin,et al. Effect of cobalt on the precipitation of Laves, gamma ' and gamma '' phases in a 718 base alloy with 1.2 wt.% Al[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2021,15:4427-4436.
APA	Yao, Xiaoyu,Liu, Fang,Yang, Shulin,Liu, Dongyan,Jia, Dan,&Sun, Wenru.(2021).Effect of cobalt on the precipitation of Laves, gamma ' and gamma '' phases in a 718 base alloy with 1.2 wt.% Al.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,15,4427-4436.
MLA	Yao, Xiaoyu,et al."Effect of cobalt on the precipitation of Laves, gamma ' and gamma '' phases in a 718 base alloy with 1.2 wt.% Al".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 15(2021):4427-4436.