Abstract
In order to improve the forming efficiency of Al–7Si–0.6Mg fabricated by wire and arc additive manufacturing process (WAAM), wire with a diameter of 1.6 mm was selected as the raw material. The effect of heat input on the formability, microstructure, and properties of the WAAM alloy was investigated, and the forming model was established. The WAAM alloys were characterized by electronic universal testing, scanning electron microscopy, energy spectrum analysis, and metallographic microscopy. The results show that Al–7Si–0.6Mg alloy has a large processing window under the cold metal transfer (CMT) process, and it can be well formed with a large range of heat input. The secondary dendrite arm spacing and Fe-phase in the as-deposited alloy gradually increase with an increase in heat input, and slight overburning occurs in the heat affected zone at higher heat inputs. After solid solution and aging treatment (T6 heat treatment), the size of α-Al grain and eutectic silicon grain increases with the increase of heat input. Little anisotropy in the mechanical properties is observed except at higher heat inputs. The tensile strength is 354.5 MPa ± 7.5 MPa, yield strength is 310 MPa ± 5.5 MPa, and elongation is 6.3 ± 0.7%.
Highlights
Wire arc additive manufacturing (WAAM), which is suitable for the integrated forming of large, medium, and complex parts [1], is a technology that melts metal wires and accumulates solid parts layer by layer under the action of arc
Al–7Si–0.6Mg aluminum alloy welding wire with a diameter of 1.6 mm was selected as raw material, and manufactured as-deposited alloy by cold metal transfer (CMT)-wire arc additive manufacturing (WAAM) process
(h2). h1 is by h consists of two parts: height of the heat affected zone (HAZ) (h1) and height of the as cast zone (ACZ) (h2). h1 is affected by heat input
Summary
Wire arc additive manufacturing (WAAM), which is suitable for the integrated forming of large, medium, and complex parts [1], is a technology that melts metal wires and accumulates solid parts layer by layer under the action of arc. Ryan et al [12] investigated the influence of the raw material batch and process parameters on the porosity of 2219 alloy by CMT-WAAM. Cong et al [13,14] compared the microstructure and properties of the thin wall and block structures of Al–6.3%Cu alloy and investigated the effect of parameters on porosity of Al–6.3%Cu alloy deposited by CMT-WAAM. Gu et al [15] investigated interlayer rolling on the properties and porosity of Al–4.5Mg alloy manufactured by CMT-WAAM process. Al–7Si–0.6Mg aluminum alloy welding wire with a diameter of 1.6 mm was selected as raw material, and manufactured as-deposited alloy by CMT-WAAM process. The influence of heat input on the formability, microstructure, and properties of WAAM Al–7Si–0.6Mg alloy under the process condition of WFS > 5 m/min Al–7Si–0.6Mg alloys deposited by WAAM further engineering applications
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