On the use of gas-metal-arc-welding additive manufacturing for repurposing of low-carbon steel components: microstructur
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RESEARCH PAPER
On the use of gas-metal-arc-welding additive manufacturing for repurposing of low-carbon steel components: microstructures and mechanical properties Van Thao Le 1,2
&
Henri Paris 3
Received: 24 July 2020 / Accepted: 28 September 2020 # International Institute of Welding 2020
Abstract In this paper, the utilization of gas-metal-arc-welding additive manufacturing (GMAWAM) for the repurposing of components was explored. Herein, the GMAWAM process was used to build new low-carbon steel features on an existing low-carbon steel component to obtain a new part with new functionalities. To confirm the internal quality of the new part obtained by such a strategy that is adequate for real applications, its material properties were investigated. The obtained results reveal that the new features (i.e., thin walls) built by GMAWAM possess different microstructure types. The upper region of thin-walled features exhibits lamellar structures, whereas the middle region is characterized by granular structures, and mixed equiaxed and lamellar grains appear in the bottom region. Particularly, the new features have an excellent bonding strength with the existing part. The material properties of GMAWAM-repurposed parts also meet industrial requirements, confirming that the GMAWAMrepurposed parts are adequate with real applications. Keywords Repurposing . Wire arc additive manufacturing . Low-carbon steel . Microstructures . Material properties
1 Introduction Additive manufacturing (AM) technologies are receiving much attention from both the industrial and academic fields because of their capability of manufacturing complex geometries including internal structures and parts made of hardly machined materials. Based on the layer-by-layer manufacturing principle, AM uses only an amount of materials that is needed to build the designed parts plus an allowance necessary for finishing operations and support structures if necessary. Therefore, material wastes and environmental impacts Recommended for publication by Commission I - Additive Manufacturing, Surfacing, and Thermal Cutting * Van Thao Le [email protected] 1
Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
2
Advanced Technology Center, Le Quy Don Technical University, Hanoi, Vietnam
3
CNRS, Grenoble INP, G-SCOP, Univ. Grenoble Alpes, F-38000 Grenoble, France
can be reduced [1, 2]. Moreover, through the topological optimization in designing a lightweight part that AM is capable of fabricating, raw materials can be saved [3]. AM is nowadays applied successfully in aerospace, automotive, and biomedical engineering [4]. According to the classification in [5], there are three main groups of metal-based AM systems: powder bed fusion (PBF), powder feed deposition (PFD), and wire feed deposition (WFD) systems. PBF-AM systems use a high-power laser source or electron beam as a heat source to melt metal powder in a powder bed layer-by-layer. On the other hand, PFD-AM systems use a deposition head or a powder nozzle to jet metal powder w
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