Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique
Laser powder bed fusion (LPBF) manufactured Inconel 718 superalloy (IN718) parts exhibit inferior creep properties compared to their conventionally manufactured (CM) counterparts due to the unique microstructural features associated with them. In this study, two different heat treatment schedules we...
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sg-ntu-dr.10356-1807332024-10-22T05:05:59Z Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique Liu, Fei Radhakrishnan, Jayaraj Pavan, A. H. V. Ramamurty, Upadrasta School of Mechanical and Aerospace Engineering Institute for Materials Research and Engineering, A*STAR Engineering Post-heat treatment Laves phase Laser powder bed fusion (LPBF) manufactured Inconel 718 superalloy (IN718) parts exhibit inferior creep properties compared to their conventionally manufactured (CM) counterparts due to the unique microstructural features associated with them. In this study, two different heat treatment schedules were employed, to critically examine role of distinct microstructural features associated with LPBF on the creep performance of LPBF IN718. Experimental results reveal that the creep performance is controlled by the Laves and γ′′ phases, as well as the cellular structure. Specially, the effective dissolution of Laves phases that are distributed along the grain and cellular boundaries in the as-fabricated state during solution treatment reduces the cavity nucleation sites and hence, extends the creep lifetime. The release of Nb into the matrix contributes to the precipitation of primary strengthening γ′′ phase during subsequent aging, enhancing the creep resistance. More importantly, the formation of a unique cellular structure with densely distributed γ′′ phase along the cellular boundaries, which exhibits high impediment of dislocation movement and inhibition of crack propagation, results in superior creep performance. The findings of the current study provide an effective heat treatment strategy for achieving high creep performance in LPBF nickel-based superalloys. Agency for Science, Technology and Research (A*STAR) The authors gratefully acknowledge funding from A*STAR, Singapore via the Structural Metals and Alloys Programme (No. A18B1b0061). 2024-10-22T05:05:59Z 2024-10-22T05:05:59Z 2024 Journal Article Liu, F., Radhakrishnan, J., Pavan, A. H. V. & Ramamurty, U. (2024). Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique. Materials Science and Engineering A, 916, 147304-. https://dx.doi.org/10.1016/j.msea.2024.147304 0921-5093 https://hdl.handle.net/10356/180733 10.1016/j.msea.2024.147304 2-s2.0-85204937150 916 147304 en A18B1b0061 Materials Science and Engineering A © 2024 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies. |
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Engineering Post-heat treatment Laves phase Liu, Fei Radhakrishnan, Jayaraj Pavan, A. H. V. Ramamurty, Upadrasta Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique |
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Laser powder bed fusion (LPBF) manufactured Inconel 718 superalloy (IN718) parts exhibit inferior creep properties compared to their conventionally manufactured (CM) counterparts due to the unique microstructural features associated with them. In this study, two different heat treatment schedules were employed, to critically examine role of distinct microstructural features associated with LPBF on the creep performance of LPBF IN718. Experimental results reveal that the creep performance is controlled by the Laves and γ′′ phases, as well as the cellular structure. Specially, the effective dissolution of Laves phases that are distributed along the grain and cellular boundaries in the as-fabricated state during solution treatment reduces the cavity nucleation sites and hence, extends the creep lifetime. The release of Nb into the matrix contributes to the precipitation of primary strengthening γ′′ phase during subsequent aging, enhancing the creep resistance. More importantly, the formation of a unique cellular structure with densely distributed γ′′ phase along the cellular boundaries, which exhibits high impediment of dislocation movement and inhibition of crack propagation, results in superior creep performance. The findings of the current study provide an effective heat treatment strategy for achieving high creep performance in LPBF nickel-based superalloys. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Liu, Fei Radhakrishnan, Jayaraj Pavan, A. H. V. Ramamurty, Upadrasta |
format |
Article |
author |
Liu, Fei Radhakrishnan, Jayaraj Pavan, A. H. V. Ramamurty, Upadrasta |
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Liu, Fei |
title |
Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique |
title_short |
Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique |
title_full |
Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique |
title_fullStr |
Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique |
title_full_unstemmed |
Role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured Inconel 718 alloy using the laser powder bed fusion technique |
title_sort |
role of the γ′′ precipitation at the cell boundaries in enhancing the creep resistance of additively manufactured inconel 718 alloy using the laser powder bed fusion technique |
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2024 |
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https://hdl.handle.net/10356/180733 |
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1814777758568415232 |