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Effect of CMT-WAAM Process Parameters on Bead Geometry, Microstructure and Mechanical Properties of AZ31 Mg Alloy

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Abstract

Fabrication of Mg alloys using the additive manufacturing process is quite challenging owing to high oxidation and volatile nature at high temperatures. The present study investigates the effect of wire feed speed (WFS) and travel speed (TS) on single tracks of AZ31 Mg alloy fabricated using the cold metal transfer wire arc additive Manufacturing (CMT-WAAM) process. The WFS and TS of CMT-WAAM are optimized to achieve better deposition quality. An increase in WFS increased the width, height, penetration depth, and heat-affected zone of single tracks. In addition, increasing TS decreased the deposited tracks' contact angle and height. The average grain size at the interface zone, center and top portion of single tracks are 35, 42, and 60 μm. The x-ray diffraction results show only the presence of primary phase α-Mg; interestingly, the β-Mg17Al12 and η-Al8Mn5 secondary phases are identified by SEM + EDS and TEM images. The microhardness increased from the substrate to the top section of single tracks due to the increased volume fraction of secondary-phase particles. Based on the best-chosen process parameters obtained from single-track deposition, a multilayer AZ31 Mg thin wall is deposited. The UTS, YS, and % EL of the deposited thin wall in travel direction (TD) are 222 MPa, 102 MPa, and 18%, while in build direction are 202 MPa, 110 MPa, and 14%, respectively. The tensile strength and elongation % of TD and BD samples exhibited comparable properties and were higher than cast AZ31 Mg alloy.

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Acknowledgments

This study is financially supported by the Department of Science and Technology (DST) Government of India (Grant number SP/YO/2019/1287(G). The author acknowledges Prof. Udaya Bhat K, Professor Department of Metallurgical and Materials Engineering NITK, Surathkal, for providing their TEM lab facility.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, India

    Shambhu Kumar Manjhi, Srikanth Bontha & A. S. S. Balan

  2. Department of Mechanical Engineering, Indian Institute of Technology, Madras, India

    Prithivirajan Sekar

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  1. Shambhu Kumar Manjhi
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  4. A. S. S. Balan
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Correspondence to A. S. S. Balan.

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Manjhi, S.K., Sekar, P., Bontha, S. et al. Effect of CMT-WAAM Process Parameters on Bead Geometry, Microstructure and Mechanical Properties of AZ31 Mg Alloy. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08498-w

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