|About this Abstract
|MS&T21: Materials Science & Technology
|Deformation-induced Phase Transformations
|Engineering Microstructures for Conventionally and Additively Manufactured Ni-based Superalloys
|Felix Theska, Nima Haghdadi, Sophie Primig
|On-Site Speaker (Planned)
Ni-based superalloys resisting high mechanical workloads in aggressive high-temperature environments are experiencing an increase in demand. Current forecasts project ~30% growth in the commercial aircraft and gas turbine markets. To continue the ongoing technological success of superalloys, multi-scale microstructural design helps to concurrently exploit various strengthening mechanisms.
The complex microstructures of advanced superalloys consist of interfaces between phases, micron-sized precipitates, nanoscale precipitates, solute clusters, and interfacial segregation. Targeted engineering of these microstructural features is driven by advances in microscopy to unlock superior mechanical properties. Hot-formability and weldability are some of the current challenges and can be overcome by advanced conventional thermo-mechanical processing or additive manufacturing.
In this talk, we present our recent progress in microstructural engineering and microscopy of superalloys. Advanced processing of Alloy 718 and René 41 improve strength and hot workability. Electron-beam powder-bed fusion of Alloy 738 via random point scanning promotes in-situ γ' precipitation.