期刊
MATERIALS & DESIGN
卷 210, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2021.110092
关键词
Additive manufacturing; Layer-by-layer laser remelting; Molten pool; Grain refinement
资金
- National Key Research and Development Program of China [2017YFB1103900]
- Key Research and Development Program of Hubei Province [2020BAB045]
- Key Research and Development Program of Sichuan Province, China [2020YFSY0054]
This study improved the surface quality and mechanical performance of LPBF AlSi10Mg material using the layer-by-layer laser remelting method, and established a three-dimensional multi-physics coupled transient model to explain the physical mechanism of laser remelting. Experimental results demonstrated significant enhancement in material densification, surface quality, microstructure, and mechanical properties after LR treatment.
Laser Powder Bed Fusion (LPBF) is an innovative additive manufacturing technology. But it is also limited by the defects and surface quality. In this work, the layer-by-layer laser remelting (LR) method is applied to LPBF AlSi10Mg to improve the surface quality and mechanical performance. To account for the physical mechanism of the laser remelting, a three-dimension multi-physics coupled transient model is established. The numerical results indicate that the molten pool during the LR process is significantly expanded. The larger molten pool plays a great role in removing the defects. Moreover, the temperature gradient and cooling rate are simultaneously increased during the LR process, which has a considerable impact on the microstructure transformation. The densification, surface quality, including roughness, wettability, and residual stress, microstructure, and mechanical property are investigated after LR treatment based on experiments. The experimental results show that after LR treatment, the densification can be up to 99.4%. The surface hydrophilicity is limited due to roughness reduction. The average grain size of top and side surface can be decreased by 6.74% and 28.79% due to the increasement of cooling rate. The average microhardness and ductility can be improved due to grain refinement and defect elimination. (c) 2021 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
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