Effect of Cold Metal Transfer Mix Synchro-Pulse Process on the Overall Morphology, Microstructure and Mechanical Properties of Wire+ Arc Additively Manufactured AA2219 Alloy

Xiaming Chen; Xiaonan Wang; Pengchen Huan; Zengrong Hu; Zhikang Wu; Bo Zhang; Hiromi Nagaumi

doi:10.1007/s12540-022-01240-6

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자료유형: 학술저널

저자정보: Xiaming Chen (Soochow University) Xiaonan Wang (Soochow University) Pengchen Huan (Northeastern University) Zengrong Hu (Soochow University) Zhikang Wu (Soochow University) Bo Zhang (Shandong Weiqiao Pioneering Group Co. Ltd) Hiromi Nagaumi (Soochow University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.2

발행연도: 2023.2

수록면: 552 - 563 (12page)

DOI: 10.1007/s12540-022-01240-6

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The difference in droplet transfer behavior between the traditional cold metal transfer plus pulse (CMT + P) process and thenew CMT mix synchro-pulse (CMT + SP) process, and its effect on the overall morphology, porosity, microstructure andmechanical properties of WAAM-ed AA2219 alloy are studied. Compared to the pulse stage (fP = 160 Hz) of the traditionalCMT + P process, the pulse stage of CMT + SP process consists of the low-frequency pulse and high-frequency pulse (HFP)stages. The high frequency (fH = 200 Hz) of the HFP stages formed a high arc force, enlarging the molten pool and enhancingthe convection of molten pool. This increased the melting depth between passes and facilitated the flow of the moltenpool to the sides and escaping of the pores. As a result, a highly symmetric WAAM-ed AA2219 alloy with a high effectiveheight (14.2 mm) and effective area (89.6 mm2),and low porosity (0.6 ± 0.2%) was manufactured by the CMT + SP process.Moreover, the fine grains (61 μm) with a 43% (area fraction) equiaxed grains were obtained with the CMT + SP process,leading to more θ′ phases precipitating. Thus, the average microhardness and tensile strength of the CMT + SP samplesincreased to 80.2 ± 6.7 HV and 265.0 ± 17.0 MPa, respectively.

#CMT mix synchro-pulse process · AA2219 alloy · WAAM · Microstructure and mechanical properties

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