期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 929, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.167325
关键词
Laser-arc hybrid additive manufacturing; Al-6Mg-0; 3Sc alloy; Oscillating laser beam; Macro; micro-morphology; Porosity; Mechanical properties
资金
- China Postdoctoral Science Foundation
- Heilongjiang Provincial Postdoctoral Science Foundation
- Heilongjiang Provincial Key Program of Engineering Science and Technology
- [2021M700990]
- [LBH-Z20143]
- [2020ZX03A01]
In this study, an oscillating laser-arc hybrid additive manufacturing (O-LHAM) process was developed to fabricate thin-wall parts of Al-6Mg-0.3Sc alloy. Compared to wire and arc additive manufacturing (WAAM), O-LHAM showed reduced surface roughness, increased effective wall width, mitigated porosity, and refined and homogenized microstructures, resulting in improved mechanical properties of the material.
Wire-based additive manufacturing (AM) presents promising opportunities for making large components with high-price materials, such us aluminum alloys containing expensive rare earth element of scandium (Al-Sc alloy). However, wire-based AM of structurally sound and defect-free aluminum components is still challenging. In this work, an oscillating laser-arc hybrid additive manufacturing (O-LHAM) process was developed to fabricate thin-wall parts of Al-6Mg-0.3Sc alloy. To show the effect of oscillating laser beam on macro/micro-structure, porosity and mechanical properties, wire and arc additive manufacturing (WAAM) of Al-6Mg-0.3Sc alloy part was also performed for comparison. The results showed that the surface roughness of O-LHAM samples was reduced by 34.7% and the effective wall width was increased by 20% when maximum width of the wall was same with WAAM. The porosity was significantly mitigated and the microstructures was refined and homogenized due to the string effect of beam oscillating in the molten pool. The as-deposited wall of Al-Sc alloy showed an ultimate tensile strength of more than 350 MPa, reaching an exceptional level among the as-deposited aluminum alloy. The O-LHAM samples showed a higher elongation and lower anisotropy, which are resulted from the mitigated porosity and homogenized microstructure. (c) 2022 Elsevier B.V. All rights reserved.
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