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The Effects of Low Frequency on the Microstructure and Mechanical Properties of High-Strength Al-Mg Aluminum Alloys by Wire and Double-Pulsed Arc Additive Manufacturing

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Abstract

An innovative and high deposition efficiency process, the double-pulsed arc additive manufacturing process, is used to produce high-strength Al-Mg wall components. This dissertation investigates the electrical parameter acquisition, bead appearance, porosity morphology, microstructure and mechanical properties of additively manufactured high-strength Al-Mg wall components and how these are affected by the low frequency of the double-pulsed arc additive manufacturing process. Then, using this process at different low frequencies of 0, 1, 3, 5, 7 and 9 Hz, multilayer deposition experiments were performed. It can be observed that the deposit porosity is obviously eliminated compared with cold metal transfer (CMT) process. The bead appearance of the deposited aluminum wall varies clearly with low frequencies, and at a low frequency of 3 Hz, its appearance is the best of all. The optical observation of microstructure proves that the average grain size varies significantly with low frequency, and at a low frequency of 1 Hz, it is the smallest. In addition, the deposited wall showed maximum mean microhardness and maximum ultimate tensile strength at a low frequency of 3 Hz. Considering the deposited porosity and mechanical priorities, double-pulsed arc additive manufacturing with a frequency of 3 Hz is more suitable for making high-strength Al-Mg wall components than at other low frequencies.

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Acknowledgments

The authors would like to thank Professor Stewart Williams and Dr. Jialuo Ding from Cranfield University for their expertise in the WAAM field. The authors are also grateful for financial support from the National Defence Scientific Research Project and Jiangsu Province’s Innovation Team Project. In addition, this work is supported in part by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) project, which is gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People’s Republic of China

    Yuehai Feng, Lei He, Kehong Wang & Xuanyu E

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  1. Yuehai Feng
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  2. Lei He
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Correspondence to Yuehai Feng.

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Feng, Y., He, L., Wang, K. et al. The Effects of Low Frequency on the Microstructure and Mechanical Properties of High-Strength Al-Mg Aluminum Alloys by Wire and Double-Pulsed Arc Additive Manufacturing. J. of Materi Eng and Perform 27, 5591–5604 (2018). https://doi.org/10.1007/s11665-018-3710-2

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  • DOI: https://doi.org/10.1007/s11665-018-3710-2

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