Crystal growth control of Ni-based alloys by modulation of the melt pool morphology in DED
文献类型:期刊论文
作者 | Shao, Jiayun1,3; Yu, Gang1,2,3; Li, Shaoxia1,3; He, Xiuli1,3; Tian, Chongxin1,3; Dong, Binxin1,3; He XL(何秀丽); Yu G(虞钢); Li SX(李少霞); Tian CX(田崇鑫) |
刊名 | JOURNAL OF ALLOYS AND COMPOUNDS |
出版日期 | 2022-03-25 |
卷号 | 898页码:14 |
ISSN号 | 0925-8388 |
关键词 | Laser deposition Crystal growth Melt pool morphology Ni-based superalloys |
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 |
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.,...&田崇鑫.(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 | 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. |
入库方式: OAI收割
来源:力学研究所
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