| Abstract Scope |
The consolidation of Oxide Dispersion Strengthened (ODS) alloys usually involves pressing at high temperatures, which typically prevents the fabrication of complex-shaped parts. The machining of these materials is also diffi-cult. These limitations are thus preventing wider use of ODS materials. The viability of processing ODS powders by Selective Laser Melting (SLM) has been demonstrated in recent years on various materials (i.e. Nickel, Steels, TiAl..), allowing to produce parts with complex shapes, with limited dispersoid coarsening due to the short melt-pool lifetime and high cooling rate.
The processability of a Y2O3-modified, γ'-strengthened Ni-Cr-Al-Ti model alloy was studied under various SLM conditions. We show how the molten metal interacts with oxide nanoparticles, and relate it to the resulting mi-crostructure (grain refinement, cracking susceptibility, porosity, slagging). Additionally, the efficacy of a HIPing procedure, as well as the interaction between the ODS nanoparticles and γ' precipitates, were investigated. |