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Investigation of surface roughness, microstructure, and mechanical properties of overhead structures fabricated by wire + arc additive manufacturing

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Abstract

This study aims to investigate surface roughness, microstructure, and mechanical properties of overhead thin-wall structures of stainless steel(SS316L) fabricated by cold metal transfer (CMT)-based wire + arc additive manufacturing (WAAM). In the first stage, single-layer bead experiments were carried out in flat and overhead positions utilizing Box-Behnken experimental design with a range of process parameters (i.e., wire feed rate, travel speed, and weave amplitude). To study the effect of individual process parameters on the bead geometry and identify a process window, analysis of variance(ANOVA) is performed using the bead cross-section measurement data. For single layer bead experiments in flat and overhead position, out of all process parameters, the weave amplitude is the most significant parameter on bead width, whereas travel speed is most significant parameter for bead height. Based on single-layer bead experiments, process parameters for thin wall deposition were identified. In the second stage, two thin-walls were deposited with wire feed rates of 1000 and 1500 mm/min in the overhead position. The surface roughness was measured using cloud point data acquired from the coordinate measuring machine(CMM). The deposited structure with the wire feed rate of 1500 mm/min resulted in better surface quality. It was also observed that, microstructure was composed of austenite and dendritic delta ferrite. The microstructure changed as the deposition height increased. The average microhardness value was measured 183 HV and 187.4 HV for the overhead structures. Average tensile properties of the SS316L overhead structures were comparable to that of SS316L fabricated by other WAAM processes.

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Funding

This material is based upon work supported by the National Science Foundation under Grant No. 2015693. The authors of this paper appreciate the continuous support provided by the Center for Manufacturing Research (CMR) and the Department of Manufacturing and Engineering Technology at Tennessee Technological University.

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Sainand Jadhav: Writing – original draft, Validation, Methodology, Investigation. Gwang Ho Jeong: Writing – review & editing, Computational Modeling, Conceptualization. Mahdi Sadeqi Bajestani: Writing – review & editing, Investigation, Formal analysis. Saiful Islam: Writing – review & editing, Investigation. Ho-Jin Lee: Writing – review & editing, Conceptualization. Young Tae Cho: Writing – review & editing, Conceptualization. Duck Bong Kim: Writing – review & editing, Project administration, Funding acquisition, Conceptualization.

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Correspondence to Duck Bong Kim.

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Jadhav, S., Jeong, G.H., Bajestani, M.S. et al. Investigation of surface roughness, microstructure, and mechanical properties of overhead structures fabricated by wire + arc additive manufacturing. Int J Adv Manuf Technol 131, 5001–5021 (2024). https://doi.org/10.1007/s00170-024-13330-3

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