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Abstract
Wire arc additive manufacturing (WAAM) of aluminium alloys is a rising technique for manufacturing large and complex parts. Based on the advanced GMAW-variants with dynamic wire feeding linked to a controlled current and voltage waveform, even alloys considered as less or even unweldable can be successfully deposited by WAAM. This study focuses on both weldable and less weldable 5183 and 2219 respectively. First, this work investigates the influence of different deposition strategies for thin and thick wall manufacturing of 5183 Al on the component properties, since different strategies imply different heat concentrations and dissipation. Microstructure, mechanical strength, and damage mechanisms are then related to the printing deposition path. Computed tomography scans are performed in order to capture the crack formation and propagation under tensile loading of the deposited 5183 Al. Second, 2219 alloy is deposited, and the influence of deposition strategy is similarly investigated for thick wall manufacturing using weaving techniques. As 2219 Al is a heat-treatable alloy, post-WAAM heat treatments are performed in order to restore peak-aged strength. The influence of heat treatment is quantified in terms of microstructural changes. The as-deposit and heat-treated 2219 alloys are then fully characterized for measuring the mechanical properties and for identifying the damage mechanisms in both as-deposit and peak-aged conditions. Tomography scans are obtained before and after straining the material, highlighting the influence of defects on crack propagation. The found results will be used in ongoing research related to the development and characterization of components of 7xxx Al alloy manufactured by WAAM.
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Lezaack, M. B., Gomes Nunes Silva, R., Verlinde, W., & Simar, A. (2023). Understanding the influence of WAAM deposition strategy on mechanical properties and damage mechanisms of 5183 and 2219 Al alloys. THERMEC 2023, Vienne, Autriche. https://hdl.handle.net/2078.5/245397