Modelling and experimental observation of the deposition geometry and microstructure evolution of aluminum alloy fabricated by wire-arc additive manufacturing
| Autor: | Jun Du, Ruwei Geng, Zhengying Wei, Siyuan Xu, Ninshu Ma |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Strategy and Management Alloy Energy-dispersive X-ray spectroscopy chemistry.chemical_element 02 engineering and technology Substrate (electronics) Management Science and Operations Research engineering.material 021001 nanoscience & nanotechnology Microstructure Industrial and Manufacturing Engineering Temperature gradient Dendrite (crystal) 020901 industrial engineering & automation chemistry Aluminium engineering Deposition (phase transition) Composite material 0210 nano-technology |
| Zdroj: | Journal of Manufacturing Processes. 64:369-378 |
| ISSN: | 1526-6125 |
| DOI: | 10.1016/j.jmapro.2021.01.037 |
| Popis: | In this paper, a model composed of a macroscopic finite element (FE) model coupled with a microscopic phase field (PF) model was constructed to investigate the Al alloy microstructure evolution during wire arc additive manufacturing (WAAM). First, the relationships between single layer process parameters and the resulting deposition geometries (width and height) were investigated. A three-dimensional FE model was built to calculate the thermal distribution and temperature gradient under different process parameters. These results were then fed into a PF model to obtain the microstructure corresponding to each set of process parameters. A bridge was constructed by this method, starting from the WAAM process parameters and yielding the microstructure throughout solidification. The simulated results showed that the primary dendrite arm spacing (PDAS) decreased slightly with current increases, but the substrate moving speed had a more obvious impact on PDAS, which rose significantly with increased substrate speed. Finally, metallographic examination and energy dispersive spectroscopy tests were conducted on specimens fabricated by WAAM with different process parameters, to verify the simulated PF results. The simulated morphology and size of dendrites were in good agreement with experimental results. |
| Databáze: | OpenAIRE |
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