Authors:
Lorena Emanuelli (INSTM (Operative center: University of Trento), Italy),
Alireza Jam (University of Trento, Italy),
Raffaele De Biasi (University of Trento, Italy),
Matteo Benedetti (University of Trento, Italy),
Massimo Pellizzari (University of Trento, Italy)
Abstract:
Development of innovative cellular structures fabricated by laser powder bed fusion (LPBF) of beta titanium alloy in the orthopedic implant fields are in continuous evolution. Recent studies highlighted the promising performances of ß-Ti21S alloy, namely low elastic modulus, extraordinarily ductility and high fatigue resistance that makes it competitive with respect to Ti6Al4V. Considering cellular structures, auxetic and Triply Periodic Minimal Surface (TPMS) structures have received great interest in the recent year. Auxetic structure is interesting to achieve very low elastic modulus and TPMS to promote osseointegration. Furthermore, recent studies propose cellular structures with a porosity gradient to combine mechanical performances and bone tissue growth. In this work manufacturability of auxetic and TPMS structures in ß-Ti21S alloy having 2.5 mm cell size and a porosity gradient inside the structures are investigated. Dimensional precision analysis comparing CAD with printed structures, microstructure characterization and defectiveness analysis of surface and bulk are carried out.
DOI:
https://doi.org/10.59499/WP225371800