Alloy Design for Laser Additive Manufacturing – Challenges and Opportunities
Event details
| Date | 21.11.2016 |
| Hour | 13:15 › 14:15 |
| Speaker | Dr. Christian Leinenbach, Empa – Swiss Federal Laboratories for Materials Science and Technology Alloy Design for Advanced Processing Technologies Group (ADAPT) |
| Location | |
| Category | Conferences - Seminars |
Metal additive manufacturing (AM) techniques are powder-based, layer by layer methods which can directly build 3D structures onto substrates with complex geometries. They offer a unique ability to dynamically mix materials during the deposition process and produce functionally graded structures, new composite microstructures and perhaps even new material classes. An important benefit lies also in the possibility of repairing components. For the additive manufacture of metals and alloys, selective laser melting (SLM) and laser direct metal deposition (LMD) are usually applied. However, there have been only a limited number of more or less easily processable alloys used in SLM so far, and the processing parameters are usually obtained from a trial-and-error approach. In order to exploit the advantages of SLM, novel alloys and composites those are adapted to the special processing conditions during SLM need to be developed. This requires a deep understanding of the materials science of metal additive manufacturing, which is currently still lacking. Some of the challenging issues related to the energy beam based process are the very high heating and cooling rates, leading to non-equilibrium microstructures, which are usually harder, less ductile, and often exhibit high residual stresses; the strongly textured, anisotropic microstructures inherited from the solidification conditions; or the pronounced residual stresses resulting from the large thermal gradients in the AM fabricated parts. However, the very rapid consolidation of the material in a small material volume and the achieved high solidification rates allow for the manufacture of components containing meta-stable materials, as for example metal-diamond composites or new types of oxide dispersion strengthened (ODS) alloys, which are difficult or even impossible to manufacture using conventional casting or sintering processes. This talk will give an overview of the challenges and opportunities in metal additive manufacturing from a materials scientist’s perspective and some relevant results of the AM related research at Empa with a particular emphasize on alloy design will be presented. References:
- C. Kenel, D. Grolimund, J.F. Fife, V.A. Samson, S. Van Petegem, H. Van Swygenhoven, C. Leinenbach, Combined in situ synchrotron microXRD and high-speed imaging on rapidly heated and solidified Ti-48Al under additive manufacturing conditions, Scripta Materialia 114 (2016) 117-120
- C. Kenel, C. Leinenbach, Influence of cooling rate on microstructure formation during rapid solidification of binary TiAl alloys, Journal of Alloys and Compounds 637 (2015) 242-247
- A.B. Spierings, C. Leinenbach, C. Kenel. K. Wegener, Processing of metal-diamond-composites using selective laser melting, Rapid Prototyping Journal 21(2) (2015) 130-13
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Practical information
- General public
- Free
Organizer
- Fabien Sorin and Michele Ceriotti
Contact
- Fabien Sorin and Michele Ceriotti