Timercan, Anatolie, Campion, Donatien, Terriault, Patrick et Brailovski, Vladimir.
2024.
« Laser powder bed fusion of superelastic Ti-Ni lattice structures: Process design and testing ».
Journal of Manufacturing and Materials Processing, vol. 8, nº 4.
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Résumé
Laser powder bed fusion allows the production of complex geometries and eases the shaping of difficult-to-transform materials, such as near-equiatomic Ti-Ni shape memory alloys. In this study, a numerical model was used to select 11 sets of printing parameters with different volumetric energy densities (VEDs) and build rates (BRs) to produce bulk Ti-50.26at%Ni alloy specimens. The manufactured specimens were studied in terms of their structural integrity, printed density, chemical composition, transformation temperatures, and crystalline phases. At high VEDs and low BRs, a significant decrease in the nickel content was observed. VED = 90 J/mm3 and BR = 10 cm3/h yielded a printed density of 99.94% and an austenite finish temperature of Af = 26.3 ◦C. The same printing conditions were used to produce 60% porous diamond and gyroid lattice structures. After heat treatment at 500 ◦C for 30 min, the diamond lattices manifested larger apparent recovery strains (7 vs. 6%), higher compliance (2.9 vs. 3.4 GPa), and similar yield stresses (~48 MPa) compared to their gyroid equivalents. The numerical model predicted that at an equivalent apparent compression strain of 6%, only a ~2% volume fraction of the diamond lattice material underwent plastic deformation as compared to ~20% for its gyroid equivalent.
| Type de document: | Article publié dans une revue, révisé par les pairs |
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| Professeur: | Professeur Terriault, Patrick Brailovski, Vladimir |
| Affiliation: | Génie mécanique, Génie mécanique |
| Date de dépôt: | 20 sept. 2024 18:19 |
| Dernière modification: | 28 oct. 2024 15:22 |
| URI: | https://espace2.etsmtl.ca/id/eprint/29552 |
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