The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism

doi:10.1016/j.msea.2025.147862

IMR OpenIR

	The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism
	Yang, Xingming 1; Liu, Miao 2; Yu, Hao 1; Liu, Zhongqiu 2; Li, Jinguo 3; Xu, Wei 1
通讯作者	Yu, Hao(yuhao@ral.neu.edu.cn)
	2025-02-01
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	924 页码:11
摘要	Cracking defects forming during additive manufacturing (AM) process in Ni superalloys have posed great challenge in application, since the spatial distributions of AM cracks are generally complex and lack regularity. In this work, investigations on the mechanisms governing the spatial distribution of cracks have been conducted based on a self-developed Ni superalloy AMS-nDB (Additive Manufacturable Superalloys with no Distribution of boron). The microstructural features including grain size, grain boundary misorientation, precipitates, and primary dendrite arm spacing (PDAS) distribution of have been characterized and simulated systematically. The AM cracks in as-printed samples are observed to locate exclusively in the bottom region in vicinity of the substrate. By excluding the possible effect of residual stress, grain size and grain boundary misorientation, the formation of unevenly distributed cracks in the alloy has been attributed to the heterogeneous precipitation behaviors. More specifically, detrimental Cr2B borides precipitate in the bottom region of the samples along the crack path, leading to the hot-tear cracking. The formation of borides is due to the different elemental segregation behaviors along the building direction, originating from the variations in the temperature gradient. Based on the unveiled cracking mechanism, the printing strategy has been optimized accordingly, which manage to manipulate the precipitation behaviors and effectively eliminate the cracking. The findings provide guidance for microstructure optimization and cracking suppression in AM-ed Ni superalloys.
关键词	Additive manufacturing Ni superalloy Crack distribution Microstructure
资助者	National Key Research and Development Program ; National Natural Science Foundation of China
DOI	10.1016/j.msea.2025.147862
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program[2021YFB3702502] ; National Natural Science Foundation of China[52204383]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001402932700001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180432
专题	中国科学院金属研究所
通讯作者	Yu, Hao
作者单位	1.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China 2.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Yang, Xingming,Liu, Miao,Yu, Hao,et al. The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2025,924:11.
APA	Yang, Xingming,Liu, Miao,Yu, Hao,Liu, Zhongqiu,Li, Jinguo,&Xu, Wei.(2025).The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,924,11.
MLA	Yang, Xingming,et al."The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 924(2025):11.