Print Email Facebook Twitter Fabrication of low thermal expansion Fe–Ni alloys by in-situ alloying using twin-wire arc additive manufacturing Title Fabrication of low thermal expansion Fe–Ni alloys by in-situ alloying using twin-wire arc additive manufacturing Author Sood, A. (TU Delft Team Marcel Hermans) Schimmel, Jim (Student TU Delft) Bosman, Marko (Fokker/GKN Aerospace) Goulas, Constantinos (University of Twente) Popovich, V. (TU Delft Team Vera Popovich) Hermans, M.J.M. (TU Delft Team Marcel Hermans) Date 2024 Abstract The binary Fe–Ni system offers alloys with notably low linear coefficients of thermal expansion (CTE), contingent upon their Ni content. In this respect twin-wire arc additive manufacturing (T-WAAM) presents the opportunity of in-situ alloying through the simultaneous feeding of two metal wires into a weld pool to obtain desired alloy compositions. This study aims to deposit a graded wall with Ni contents targeted at 42, 46, and 52 wt% in the building direction of the wall, along with a block comprising of 46 wt% Ni, employing the T-WAAM approach. The results show effective incorporation of additional Ni into the weld pool and geometrically stable weld beads in the continuous metal transfer mode during the T-WAAM process. This mode led to the defect-free and chemically stable deposition of the graded wall and the block with average Ni contents of 42.3 ± 1.1, 45.8 ± 1.4, 52.6 ± 0.8 wt%, and 46.4 ± 0.9 wt%, respectively. The measured Curie temperatures of the as-deposited alloys and the mean CTE values of alloy 46 were found to be comparable to the commercial alloys. In summary, this study validates the feasibility of in-situ deposition of low thermal expansion alloy compositions, thereby enabling the possibility of on-demand thermal expansion properties. Subject Fe-Ni alloysFunctional gradingIn-situ alloyingT-WAAMThermal expansion To reference this document use: http://resolver.tudelft.nl/uuid:46f5f85d-d877-4a66-a67c-a470e142cd41 DOI https://doi.org/10.1016/j.matdes.2024.112837 ISSN 0264-1275 Source Materials & Design, 240 Part of collection Institutional Repository Document type journal article Rights © 2024 A. Sood, Jim Schimmel, Marko Bosman, Constantinos Goulas, V. Popovich, M.J.M. Hermans Files PDF 1-s2.0-S0264127524002090-main.pdf 10.81 MB Close viewer /islandora/object/uuid:46f5f85d-d877-4a66-a67c-a470e142cd41/datastream/OBJ/view