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Crystal growth control of Ni-based alloys by modulation of the melt pool morphology in DED
Shao, Jiayun1,3; Yu, Gang1,2,3; Li, Shaoxia1,3; He, Xiuli1,3; Tian, Chongxin1,3; Dong, Binxin1,3
Corresponding AuthorHe, Xiuli(xlhe@imech.ac.cn) ; Tian, Chongxin(tianchongxin@imech.ac.cn)
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
2022-03-25
Volume898Pages:14
ISSN0925-8388
AbstractIn 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.
KeywordLaser deposition Crystal growth Melt pool morphology Ni-based superalloys
DOI10.1016/j.jallcom.2021.162976
Indexed BySCI
Language英语
WOS IDWOS:000749534700002
WOS KeywordGRAIN-REFINEMENT ; MICROSTRUCTURAL CONTROL ; LASER ; ORIENTATION ; DEPOSITION ; TRANSITION ; ALUMINUM ; COLUMNAR
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/88448
Collection宽域飞行工程科学与应用中心
Corresponding AuthorHe, Xiuli; Tian, Chongxin
Affiliation1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
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.
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