Print Email Facebook Twitter Local control of microstructure and mechanical properties of high-strength steel in electric arc-based additive manufacturing Title Local control of microstructure and mechanical properties of high-strength steel in electric arc-based additive manufacturing Author Babu, A. (TU Delft Team Marcel Hermans) Ebrahimi, Amin (TU Delft Team Marcel Hermans) Wu, K. (Student TU Delft) Richardson, I.M. (TU Delft Team Marcel Hermans) Hermans, M.J.M. (TU Delft Team Marcel Hermans) Date 2023 Abstract Additive manufacturing offers a significant potential for producing metallic parts with distinctly localised microstructures and mechanical properties, commonly known as functional grading. While functional grading is generally accomplished through compositional variations or in-situ thermo-mechanical treatments, variation of process parameters during additive manufacturing can offer a promising alternative approach. Focusing on the electric arc-based additive manufacturing process, this work focuses on the functional grading of high-strength steel (S690 grade) by adjusting the travel speed and inter-pass temperature. Through a combination of thermal simulations and experimental measurements on single bead-on-plate depositions, it is shown that the microstructure and the mechanical properties of parts can be controlled through the rational adjustment of process parameters. A rectangular block was fabricated to demonstrate functional grading using a constant wire feed rate and varying travel speed. The rectangular block consisted of a low heat input (LHI) region deposited between high heat input (HHI) zones. A graded microstructure was obtained with the HHI zones composed of a mixture of polygonal ferrite, acicular ferrite, and bainite, while the LHI region was primarily composed of martensite. The hardness and profilometry-based indentation plastometry measurements indicated that the LHI region exhibited higher hardness (32%) and strength (50%), but lower uniform elongation (80%), compared to the HHI zones. The present study demonstrates the potential to achieve functional grading by adjusting process parameters in electric arc-based additive manufacturing, providing opportunities for tailor-made properties in parts. Subject High-strength steelMechanical behaviourMetal additive manufacturingMicrostructural controlThermal modellingWire arc additive manufacturing (WAAM) To reference this document use: http://resolver.tudelft.nl/uuid:e926e939-cfa3-4bb5-871d-2faead7732c9 DOI https://doi.org/10.1016/j.jmrt.2023.07.262 ISSN 2238-7854 Source Journal of Materials Research and Technology, 26, 1508-1526 Part of collection Institutional Repository Document type journal article Rights © 2023 A. Babu, Amin Ebrahimi, K. Wu, I.M. Richardson, M.J.M. Hermans Files PDF 1_s2.0_S2238785423017908_main.pdf 6.48 MB Close viewer /islandora/object/uuid:e926e939-cfa3-4bb5-871d-2faead7732c9/datastream/OBJ/view