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

doi:10.1016/j.jallcom.2021.162976

IMECH-IR > 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 JY(邵佳昀); Yu G(虞钢); Li SX(李少霞); He XL(何秀丽); Tian CX(田崇鑫); Dong BX(董斌鑫)
通讯作者	He, Xiuli(xlhe@imech.ac.cn) ; Tian, Chongxin(tianchongxin@imech.ac.cn)
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
	2022-03-25
卷号	898 页码:14
ISSN	0925-8388
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.
关键词	Laser deposition Crystal growth Melt pool morphology Ni-based superalloys
DOI	10.1016/j.jallcom.2021.162976
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000749534700002
关键词[WOS]	GRAIN-REFINEMENT ; MICROSTRUCTURAL CONTROL ; LASER ; ORIENTATION ; DEPOSITION ; TRANSITION ; ALUMINUM ; COLUMNAR
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
论文分区	一类
力学所作者排名	1
RpAuthor	He, Xiuli ; Tian, Chongxin
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/88448
专题	宽域飞行工程科学与应用中心
推荐引用方式 GB/T 7714	Shao JY,Yu G,Li SX,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	邵佳昀,虞钢,李少霞,何秀丽,田崇鑫,&董斌鑫.(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	邵佳昀,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.

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