Study on Mechanical Properties and Strengthening Mechanism of 5356 Aluminum Alloy Thin-walled Parts Prepared by CMT Arc Additive Manufacturing
5356 aluminum alloy single pass multi-layer thin-walled parts were prepared by using CMT arc additive manufacturing,and the mechanical properties of the thin-walled parts were studied.And the molten pool morphology and microstructure evolution of different deposition height under different welding currents were studied.The results show that the microstructure of 5356 aluminum alloy is mainly α(Al)matrix and β phase,and the strengthening mechanism is mainly fine grain strengthening and precipitation strengthening.The structure and properties of 5356 aluminum alloy are different at different heights.At the bottom of the part,due to more thermal cycles,the grains are relatively coarse,and the content of the secondary phase is higher and it shows continuous distribution,while at the top,due to less thermal cycles,the grains are relatively fine and the secondary phases are mainly precipitated in the form of points.As the current increases,the mechanical properties of the thin-walled part gradually decreases.
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