Crystal growth control of Ni-based alloys by modulation of the melt pool morphology in DED

doi:10.1016/j.jallcom.2021.162976

CORC > 力学研究所 > 中国科学院力学研究所 > 宽域飞行工程科学与应用中心

	Crystal growth control of Ni-based alloys by modulation of the melt pool morphology in DED
	Shao, Jiayun 1,3; Yu, Gang 1,2,3; Li, Shaoxia 1,3; He, Xiuli 1,3; Tian, Chongxin 1,3; Dong, Binxin 1,3
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2022-03-25
卷号	898 页码:14
关键词	Laser deposition Crystal growth Melt pool morphology Ni-based superalloys
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2021.162976
通讯作者	He, Xiuli(xlhe@imech.ac.cn) ; Tian, Chongxin(tianchongxin@imech.ac.cn)
英文摘要	In additive manufacturing especially in directed energy deposition, it is hard to control crystal growth pattern due to the high temperature gradient in AM. Essentially, the crystal grows epitaxially from the substrate and columnar crystals with strong texture are exhibited in AM components. Here, small spot diameter was used for DED-L of Ni-based alloys and various crystal growth patterns were obtained by changing power density. Samples processed under low power density were shown to exhibit wide and shallow spindle-like melt pool, along with apparently hierarchical planar-columnar-equiaxed microstructure. While samples prepared under relatively high power density were shown to exhibit narrower and deeper melt pool with two sharp turning points, exhibiting inclined columnar grains and several discontinuous central axial columnar crystals. When highest power density and small spot diameter were applied, crystal growth with weak texture was achieved. Under this deep and narrow melt pool, the crystal growth can be separated into four regions: nearly-equiaxed grains with random grain orientations; horizontally symmetrically grown crystal grains; axial columnar in the center; columnar grains grew approximately vertical to the boundary of melt pool. Correlations were investigated between melt pool shape, solidification parameters and microstructure. The transformation of melt pool morphology was mainly attributed to the change of power density. Solidification parameters were shown to be different under different melt pool morphology. Diverse crystal growth patterns were achieved under different melt pool morphology controlled by power density, showing the feasibility of site-specific of microstructure control in DED-L according to the required mechanical properties. (c) 2021 Elsevier B.V. All rights reserved.
WOS关键词	GRAIN-REFINEMENT ; MICROSTRUCTURAL CONTROL ; LASER ; ORIENTATION ; DEPOSITION ; TRANSITION ; ALUMINUM ; COLUMNAR
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000749534700002
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88447]
专题	宽域飞行工程科学与应用中心
通讯作者	He, Xiuli; Tian, Chongxin
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Shao, Jiayun,Yu, Gang,Li, Shaoxia,et al. Crystal growth control of Ni-based alloys by modulation of the melt pool morphology in DED[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,898:14.
APA	Shao, Jiayun,Yu, Gang,Li, Shaoxia,He, Xiuli,Tian, Chongxin,&Dong, Binxin.(2022).Crystal growth control of Ni-based alloys by modulation of the melt pool morphology in DED.JOURNAL OF ALLOYS AND COMPOUNDS,898,14.
MLA	Shao, Jiayun,et al."Crystal growth control of Ni-based alloys by modulation of the melt pool morphology in DED".JOURNAL OF ALLOYS AND COMPOUNDS 898(2022):14.