Authors:
Marion Coffigniez (UCLouvain, Institute of Mechanics Materials and Civil Engineering, IMAP, Belgium),
Amandine Duchaussoy (UCLouvain, Institute of Mechanics Materials and Civil Engineering, IMAP, Belgium),
Matthieu Marteleur (UCLouvain, Institute of Mechanics Materials and Civil Engineering, IMAP, Belgium),
Justine Papillon (Univ Lyon, INSA Lyon, UCBL, CNRS, MATEIS, UMR 5510, France),
Eric Maire (Univ Lyon, INSA Lyon, UCBL, CNRS, MATEIS, UMR 5510, France),
Pascal Jacques (UCLouvain, Institute of Mechanics Materials and Civil Engineering, IMAP, Belgium)
Abstract:
ß-metastable Ti alloys exhibit a very large work hardening rate together with an outstanding resistance to damage nucleation, bringing a very high ductility. Such a behavior could enable to counteract the decrease of mechanical properties caused by solidification cracking|hot tearing, balling or porosity formation during laser powder bed fusion. The binary Ti-12 wt.% Mo grade was chosen as a case study, using powder mixture as a first approach. As-printed microstructures highlight the formation of structures related to the solidification scheme, as well as specific Mo solute partitioning depending on the printing parameters. Such a specific microstructure brings a large increase of the tensile strength compare to the cast reference. Furthermore, when the chemical homogenisation obtained is large enough to reach 95 % of ß-metastable microstructure, ductility comparable to the cast reference is reached after a simple flash heat treatment, as well as an outstanding low sensitivity to defects.
DOI:
https://doi.org/10.59499/WP225371687