About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Laser Powder Bed Fusion of Pure Nb Powder and Nb+WC Powder Blend |
Author(s) |
Ana Sofia C. M. d'Oliveira, Eloisa Cardozo , Moataz M. Attallah |
On-Site Speaker (Planned) |
Ana Sofia C. M. d'Oliveira |
Abstract Scope |
A study was performed to investigate the impact of Laser Powder Bed Fusion (LPBF) parameters on the densification of pure Nb powder and Nb+2.5 Wt.%WC powder blend. Both materials have good processability, as confirmed by the lack of structural defects when the parameters are optimised. The presence of WC particles led to a reduction in the cracking density. Increasing both scan velocity and laser power resulted in a hardness increase in pure Niobium builds due to oxygen pickup. However, processing the Nb+2.5wt% WC blend led to a different response due to the process parameters. The hardness showed a reduction of 20% on builds processed with Nb+2.5wt%WC, compared with the pure Nb. The hardness development was associated with the effect of the dissociation of the carbide, as well as the lack of solid solution hardening effect expected due to the full solubility of W in Nb and the formation of carbides. |