Print Email Facebook Twitter Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock Title Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy Author Mohandas, N.K. (TU Delft Team Vera Popovich) Giorgini, Alex (F3nice) Vanazzi, Matteo (F3nice) Riemslag, A.C. (TU Delft Team Vera Popovich) Scott, S.P. (TU Delft Team Vera Popovich) Popovich, V. (TU Delft Team Vera Popovich) Date 2023 Abstract This study investigated the in-situ gaseous (under 150 bar) hydrogen embrittlement behaviour of additively manufactured (AM) Inconel 718 produced from sustainable feedstock. Here, sustainable feedstock refers to the Inconel 718 powder produced by vacuum induction melting inert gas atomisation of failed printed parts or waste from CNC machining. All Inconel 718 samples, namely AM-as-processed, AM-heat-treated and conventional samples showed severe hydrogen embrittlement. Additionally, it was found that despite its higher yield strength (1462 ± 8 MPa) and the presence of δ phase, heat-treated AM Inconel 718 demonstrates 64% lower degree of hydrogen embrittlement compared to the wrought counterpart (Y.S. 1069 ± 4 MPa). This was linked to the anisotropic microstructure induced by the AM process, which was found to cause directional embrittlement unlike the wrought samples showing isotropic embrittlement. In conclusion, this study shows that AM Inconel 718 produced from recycled feedstock shows better hydrogen embrittlement resistance compared to the wrought sample. Furthermore, the unique anisotropic properties, seen in this study for Inconel 718 manufactured by laser powder bed fusion, could be considered further in component design to help minimise the degree of hydrogen embrittlement. Subject Inconel 718hydrogen embrittlementadditive manufacturingrecycled powderlaser powder bed fusionanisotropy To reference this document use: http://resolver.tudelft.nl/uuid:36d62513-a2c9-47c5-8c4e-2e166391971d DOI https://doi.org/10.3390/met13020418 ISSN 2075-4701 Source Metals, 13 (2) Part of collection Institutional Repository Document type journal article Rights © 2023 N.K. Mohandas, Alex Giorgini, Matteo Vanazzi, A.C. Riemslag, S.P. Scott, V. Popovich Files PDF metals_13_00418.pdf 10.61 MB Close viewer /islandora/object/uuid:36d62513-a2c9-47c5-8c4e-2e166391971d/datastream/OBJ/view