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IJAT Vol.18 No.5 pp. 688-701
doi: 10.20965/ijat.2024.p0688
(2024)

Research Paper:

Analysis of the Relationship Between Process Parameters and Microhardness for the Finishing Process by Wire Arc Additive Manufacturing Combined with the FSB Tool of Austenitic Stainless Steel 316L

Teerayut Cordkaew, Jun’ichi Kaneko, and Takeyuki Abe ORCID Icon

Graduate School of Science and Engineering, Saitama University
255 Shimo-okubo, Sakura-ku, Saitama, Saitama 338-8570, Japan

Corresponding author

Received:
April 23, 2024
Accepted:
June 6, 2024
Published:
September 5, 2024
Keywords:
wire arc additive manufacturing, directed energy deposition, friction stir burnishing, Taguchi, microhardness
Abstract

Wire arc additive manufacturing (WAAM), based on gas metal arc welding, is ideal for fabricating components with sizeable geometries and moderate structural intricacies. However, the electric arc introduces a heat source and directional heat dissipation during deposition, resulting in undesired microstructural characteristics, such as columnar dendritic structures, which lead to variations in hardness across the printed component. Our previous research introduced the friction stir burnishing (FSB) tool integrated with WAAM using a hybrid approach called simultaneous processing. This method suppressed dendrite formation and enhanced the microstructure within WAAM. This approach directly correlates process dynamics, force dynamics, and temperature control, facilitating efficient plastic deformation. This research investigates the relationship between process parameters and microhardness within the combined manufacturing systems of WAAM and FSB tools. The study primarily focuses on using SUS 316L austenitic stainless steel wire material for WAAM and examines how simultaneous operation with the FSB tool impacts microstructure and microhardness. The investigation emphasizes three key parameters: the distance between the welding torch and the FSB tool, tool rotational speed, and machine feed speed. Comprehensive experimentation, including Taguchi analysis, determines optimal values for these parameters. Results indicate that torch-to-tool distance and machine feed speed significantly influence microhardness, while tool rotational speed shows minimal impact. The most effective combination for enhancing microhardness was a torch-to-tool distance of 20 mm, a machine feed speed of 528 mm/min, and a tool rotational speed of 1900 rpm. This combination induced a plastic deformation transformation effect, contributing to the overall improvement in microhardness. Additionally, the optimal parameters for achieving a smaller grain size were a torch-to-tool distance of 17 mm, a machine feed speed of 356 mm/min, and a tool rotational speed of 1900 rpm, as indicated by the average grain size. Furthermore, this study shows significant improvements in microstructure and hardness within 50–200 µm depth from the surface. Comparative analysis between FSB tool-processed and non-processed samples indicates a 22.51% increase in microhardness, with the grain size of the simultaneous process being 7 µm compared to 11.55 µm. Optimizing the process parameters of simultaneous processing achieves superior microhardness and microstructural refinement. Additionally, it highlights the need for further material development to address challenges associated with tool durability, paving the way for advancements in simultaneous processes.

Cite this article as:
T. Cordkaew, J. Kaneko, and T. Abe, “Analysis of the Relationship Between Process Parameters and Microhardness for the Finishing Process by Wire Arc Additive Manufacturing Combined with the FSB Tool of Austenitic Stainless Steel 316L,” Int. J. Automation Technol., Vol.18 No.5, pp. 688-701, 2024.
Data files:
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Last updated on Dec. 06, 2024