Mouret, Thibault, Leclercq, Aurore et Brailovski, Vladimir.
2025.
« The LPBF printability and as-printed mechanical properties of a Ti6246 alloy as a function of printing parameters and microstructure ».
Materials Science and Engineering: A, vol. 946.
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Résumé
Laser Powder Bed Fusion (LPBF) of titanium alloys has been widely investigated in the last decades and introduced in industry with concrete applications. Recently, the literature has highlighted the printability of various titanium alloys with different elemental compositions. Among them, a highly resilient Ti-6Al-2Sn-4Zr-6Mo alloy (Ti6246) was identified as a promising material for the automotive and aerospace industries, and the results of its successful printing using high-power systems (Pmax = 400 W) have already been reported. In the present work, Ti6246 alloy was printed on a power-limited system (Pmax = 200 W) using fifty-three printing parameter sets with variations in terms of laser power, scanning speed and hatching space, keeping the layer thickness constant at 50 μm. The as-built samples were then characterized to correlate the printing parameters to the microstructure, phases and mechanical properties. The results revealed that a volumetric energy density of ~100 J/mm3 combined with a hatching space of ~150 μm was necessary to produce highly dense (>99.9 %) samples with a reduced number of processing-induced flaws (keyhole pores and lack-of-fusion defects) and with homogeneous microstructure. These samples manifested excellent mechanical resistance and hardness (UCS >1000 MPa and HV > 450 HV0.3), but a very limited ductility, thus indicating the need for subsequent post-processing. Using printing parameters corresponding to the highest energy input (135 J/mm3) resulted in a partial in-situ α’’ → α + β phase transformation. This phenomenon was attributed to a significant overlap between two subsequently melted tracks, which reduced the cooling rate in the solidified material and promoted the formation of stable α and β phases of titanium. This latter observation provided useful insight into the printing of functionally graded Ti6246 parts.
| Type de document: | Article publié dans une revue, révisé par les pairs |
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| Professeur: | Professeur Brailovski, Vladimir |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 07 oct. 2025 12:13 |
| Dernière modification: | 15 oct. 2025 16:20 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32334 |
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