Microstructure and stress-rupture property of DD32 nickel-based single crystal superalloy fabricated by additive manufacturing

doi:10.1016/j.jallcom.2020.157180

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	Microstructure and stress-rupture property of DD32 nickel-based single crystal superalloy fabricated by additive manufacturing
	Ci, Shiwei 2,3; Liang, Jingjing 2,4,5; Li, Jinguo 2,5; Wang, Haiwei 2,3; Zhou, Yizhou 2; Sun, Xiaofeng 2; Ding, Yutian 1
	2021-02-15
关键词	Additives Aerospace industry After-heat treatment Carbides Fabrication Microstructure Nickel Nickel alloys Precipitation (chemical) Single crystals SuperalloysCracking susceptibility Dendritic segregation Dendritic structures Precipitation strengthening Single crystal superalloys Solution strengthening Stress rupture properties Stress-rupture lives
卷号	854
DOI	10.1016/j.jallcom.2020.157180
英文摘要	Additive manufacturing (AM) technology is currently undergoing rapid development in the aerospace field. However, due to the intense cracking susceptibility, additive manufacturing of nickel-based single-crystal (SX) superalloys still presents major challenges. In this paper, the crack-free SX superalloy is fabricated directly using pulsed laser. The microstructure and stress rupture property of the additively manufactured SX superalloy after heat treatment are carefully investigated and compared with conventional cast alloy. The results show that the stress rupture life of the AM sample (66.4 h) is longer than that of the cast sample (59.1 h). This is related to the difference of microstructure between AM and cast samples. AM samples have a finer dendritic structure and lower inter-dendritic segregation, which is conducive to solution strengthening and avoids the formation of TCP phase. Besides, the carbides in the AM sample is finer and evenly distributed, which is conducive to precipitation strengthening; The fine carbides are enveloped within layers of γ′ in the AM samples, which avoids the formation of cracks caused by separation of carbides and the matrix. All of those are beneficial to improve stress rupture properties. © 2020 Elsevier B.V.
会议录	Journal of Alloys and Compounds
会议录出版者	Elsevier Ltd
语种	英语
ISSN号	09258388
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/132705]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, 287 Langongping Road, Lanzhou; 730000, China 2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang; 110016, China; 3.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang; 230026, China; 4.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China; 5.Space Manufacturing Technology (CAS Key Lab), Beijing; 100094, China;
推荐引用方式 GB/T 7714	Ci, Shiwei,Liang, Jingjing,Li, Jinguo,et al. Microstructure and stress-rupture property of DD32 nickel-based single crystal superalloy fabricated by additive manufacturing[C]. 见:.