About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing of Refractory Metallic Materials
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Presentation Title |
Union of Mo and Cr Alloys into a Single Multi-materials Part Using Laser-powder Directed Energy Deposition |
Author(s) |
Vincent Jacquier, Julien Zollinger, Frédéric Schuster, Hicham Maskrot, Philippe Zeller, Wilfried Pacquentin |
On-Site Speaker (Planned) |
Vincent Jacquier |
Abstract Scope |
We present the fabrication and analysis of a refractory Mo-Cr multi-layer gradient created by LP-DED (Laser-Powder Directed Energy Deposition) with a 1.2 mm wide laser spot. An inductive heating system allows the preheating of the substrate to increase the delivered energy and mitigate crack formation. Mo being more refractory than Cr the injection of Mo powders in a Cr-rich melt pool leads to a Mo-Cr interface containing partially dissolved Mo particles. With increasing power and Mo content in subsequent layers the complete fusion of Mo powder in Mo-rich melt pools is obtained. The high measured micro-hardness is attributed to solid solution strengthening combined with the fine micrometric equiaxed grains generated. Deposition of Mo on Cr is eased by the generation of a compositional gradient which leverages the complete solubility of these two metals to smooth the abrupt changes in properties and process parameters, thus avoiding the overheating of the initial Cr layer. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, High-Temperature Materials, Surface Modification and Coatings |