Version 1
: Received: 9 May 2024 / Approved: 10 May 2024 / Online: 10 May 2024 (20:05:25 CEST)
How to cite:
Tucho, W. M.; Ohm, B. A.; Canizalez, S. A. P.; Egeland, A.; Mildt, M. B.; Nedreberg, M. L.; Hansen, V. F. Effects of Phase and Annealing Twins on Mechanical Properties and Impact Toughness of L-PBF Inconel 718. Preprints2024, 2024050684. https://doi.org/10.20944/preprints202405.0684.v1
Tucho, W. M.; Ohm, B. A.; Canizalez, S. A. P.; Egeland, A.; Mildt, M. B.; Nedreberg, M. L.; Hansen, V. F. Effects of Phase and Annealing Twins on Mechanical Properties and Impact Toughness of L-PBF Inconel 718. Preprints 2024, 2024050684. https://doi.org/10.20944/preprints202405.0684.v1
Tucho, W. M.; Ohm, B. A.; Canizalez, S. A. P.; Egeland, A.; Mildt, M. B.; Nedreberg, M. L.; Hansen, V. F. Effects of Phase and Annealing Twins on Mechanical Properties and Impact Toughness of L-PBF Inconel 718. Preprints2024, 2024050684. https://doi.org/10.20944/preprints202405.0684.v1
APA Style
Tucho, W. M., Ohm, B. A., Canizalez, S. A. P., Egeland, A., Mildt, M. B., Nedreberg, M. L., & Hansen, V. F. (2024). Effects of Phase and Annealing Twins on Mechanical Properties and Impact Toughness of L-PBF Inconel 718. Preprints. https://doi.org/10.20944/preprints202405.0684.v1
Chicago/Turabian Style
Tucho, W. M., Mette Lokna Nedreberg and Vidar Folke Hansen. 2024 "Effects of Phase and Annealing Twins on Mechanical Properties and Impact Toughness of L-PBF Inconel 718" Preprints. https://doi.org/10.20944/preprints202405.0684.v1
Abstract
This study examines the effects of the δ phase and annealing twins on the hardness, Charpy impact toughness, and tensile properties of Inconel 718 fabricated using L-PBF. Two heat treatment methods, involving solid solution and precipitation hardening, were utilized. The δ phase was formed through solid solution heat treatment at 980C for 1 hour while annealing twins were generated at 1100C for 3 hours. After precipitation hardening, specimens with a higher concentration of precipitates exhibited increased ultimate tensile strength (13%), yield strength (27%), and hardness (12%) compared to those with annealing twins. This can be attributed to the smaller grain size, subgrains, and δ precipitates, which contribute to the differences in mechanical strength. On the contrary, specimens with annealing twins showed significantly higher impact toughness (4 times) and ductility (twice) than those with δ precipitates. This is caused by the formation of precipitates, which serve as sites for void formation and crack propagation, leading to a decrease in plasticity due to lattice mismatches with the matrix. Microstructural, compositional, phase, crystallographic, and fractographic analyzes were performed using OM, SEM, TEM and XRD techniques to identify the factors responsible for the variations in the measurements. The results demonstrate that the heat treatment method involving annealing twins significantly improves the ductility of Inconel 718 while maintaining the required mechanical strength.
Engineering, Metallurgy and Metallurgical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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