Knowledge Management System of Institue of Mechanics, CAS
| 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)
| |
| Corresponding Author | He, Xiuli([email protected]) ; Tian, Chongxin([email protected]) |
| Source Publication | JOURNAL OF ALLOYS AND COMPOUNDS
 |
| 2022-03-25 | |
| Volume | 898Pages:14 |
| ISSN | 0925-8388 |
| Abstract | 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. |
| Keyword | Laser deposition Crystal growth Melt pool morphology Ni-based superalloys |
| DOI | 10.1016/j.jallcom.2021.162976 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000749534700002 |
| WOS Keyword | GRAIN-REFINEMENT ; MICROSTRUCTURAL CONTROL ; LASER ; ORIENTATION ; DEPOSITION ; TRANSITION ; ALUMINUM ; COLUMNAR |
| WOS Research Area | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | He, Xiuli ; Tian, Chongxin |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/88448 |
| Collection | 宽域飞行工程科学与应用中心 |
| Recommended Citation 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.Rp_Au:He, Xiuli, Tian, Chongxin |
| 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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Jp2022FA474_2022_Cry（14756KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment