Droplet control and grain refinement in magnetic-assisted CMT additive manufacturing of 2319 aluminum alloy
The influence of excitation current on the microstructure and mechanical properties of the formed components was analyzed, focusing on the interaction between the magnetic field, the arc, molten droplets, and the molten pool. Results showed that the application of a magnetic field significantly impr...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425011032 |
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| Summary: | The influence of excitation current on the microstructure and mechanical properties of the formed components was analyzed, focusing on the interaction between the magnetic field, the arc, molten droplets, and the molten pool. Results showed that the application of a magnetic field significantly improved the surface quality by reducing wave-like fluctuations on the component's side, with the optimal excitation current being 3A. At this current, the surface was smooth, and the grain structure was fine and homogeneous. This magnetic field application was crucial in stabilizing the arc, reducing non-steady-state behavior in the CMT process, and enhancing molten droplet transition, which prevented splattering and promoted stronger bonds between molten droplets and remelted metal. As a result, grain refinement was achieved, and the mechanical properties, including tensile strength and elongation, were significantly improved. At 3A excitation current, the tensile strength in the additive and scanning directions reached 269 MPa and 268 MPa, respectively, with elongation values of 20.5 % and 19.5 %, showing notable improvement compared to the no-field condition. These findings suggest that applying a magnetic field in the arc-based AM process is an effective method for optimizing the surface, microstructure, and mechanical properties of the formed components. |
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| ISSN: | 2238-7854 |