The deposit morphology, microstructure, and mechanical properties of wire and arc additive manufacturing (WAAM) of ER2319 aluminium alloy with and without assisted longitudinal magnetic field (ALMF) were investigated comprehensively and comparatively in this study. The results showed that the ALMF improved the surface forming accuracy slightly, and effectively promoted the equiaxed transformation of grains. Simultaneously, the introduction of ALMF is beneficial to improving the morphology and distribution of the strengthening phase and reducing the tendency of intergranular corrosion caused by the segregation of Cu elements along the grain boundaries. Moreover, ALMF can remarkably reduce the generation rate of large pores, thereby effectively improving the tensile strength of the deposits and reducing the anisotropy of mechanical properties.
Wire arc additive manufacturing (WAAM) process is widely used in large steel components. However, WAAM severe heat accumulation reduced the accuracy of the products, its microstructure and mechanical properties also deteriorate. Compared with common steel, it is more difficult to get complicated stainless steel components with WAAM due to its weak heat dispersion. To efficiently mitigate the heat accumulation, this paper presented a water-medium active cooling additive manufacturing system to complete a 304 stainless steel thin-walled structure. As a result, taller and narrower thin-walled parts could be gotten with 7% increase in average height and 13% decrease in average width. Simultaneously, the surface waviness is reduced, grains are refined and fracture properties of thin-walled parts are improved.
In this investigation, Al-Cu alloy was used for wire-arc additive manufacturing experiment with and without assisted longitudinal magnetic field (ALMF) introduced, subsequently, heat treatment was conducted, aiming to investigate the variations of the improved characteristics brought by ALMF on microstructure and mechanical properties after heat-treated. The results indicated that the improved pores condition brought by ALMF was greatly weakened after heattreated, while the promotion for the columnar to equiaxed transition and the improvement to precipitation remained. As for mechanical properties, the improvement of the uniform distribution of microhardness by the ALMF deteriorated. Moreover, the optimisation brought by ALMF on reducing the anisotropy of tensile strength was greatly weakened, and the improvement of elongation disappeared.
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