Effects of Solution Treatment Temperatures on Microstructure and Mechanical Properties of TIG–MIG Hybrid Arc Additive Manufactured 5356 Aluminum Alloy

Wei Zuo; Le Ma; Yu Lu; Shu‑yong Li; Zhiqiang Ji; Min Ding

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자료유형: 학술저널

저자정보: Wei Zuo (Taiyuan University of Technology) Le Ma (Taiyuan University of Technology) Yu Lu (Taiyuan University of Technology) Shu‑yong Li (Taiyuan University of Technology) Zhiqiang Ji (Taiyuan University of Technology) Min Ding (Taiyuan University of Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.6

발행연도: 2018.1

수록면: 1,346 - 1,358 (13page)

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A novel additive manufacturing method with TIG–MIG hybrid heat source was applied for fabricating 5356 aluminumalloy component. In this paper the microstructure evolution, mechanical properties and fracture morphologies of both asdepositedand heat-treated component were investigated, and how these were affected by different heat-treated temperature. The as-deposited microstructure showed dominant equiaxed grains with second phase, and the size of them is coarse in thebottom region, medium in the middle region and fine in the top region owing to different thermal cycling conditions. Comparedwith as-deposited microstructure, the size of grain becomes large and second phases gradually dissolve in the matrixas heat-treated temperature increase. Different microstructures determine the mechanical properties of component. Resultsshow that average ultimate tensile strength enhances from 226 to 270 MPa and average microhardness increases from 64.2to 75.3 HV0.1 but ductility decreases from 33 to 6.5% with heat-treated temperature increasing. For all components, thetensile properties are almost the same in the vertical direction (Z) and horizontal direction (Y) due to equiaxed grains, whichexhibits isotropy, and the mechanisms of these are analyzed in detailed. In general, the results demonstrate that hybrid archeat source has the potential to fabricate aluminum alloy component.

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