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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Continuous Phase Transformations
Presentation Title Microstructural Engineering of Ni-based Superalloys Processed by Conventional and Additive Manufacturing
Author(s) Felix Theska, Nima Haghdadi, Sophie Primig
On-Site Speaker (Planned) Sophie Primig
Abstract Scope The demand for Ni-based superalloys withstanding high mechanical workloads under aggressive high-temperature environments is growing continuously. Market forecasts predict an increase of ~30% in commercial aircraft and gas turbines. The ongoing technological success of superalloys is due to their multi-scale hierarchical microstructural design achieving contributions from different strengthening mechanisms. A typical microstructure of an advanced superalloy consists of various interfaces, micron-scale precipitates, complex nano-scale precipitates, solute clusters, and solute segregation at interfaces. Targeted engineering of these multi-scale hierarchical microstructures unlocks superior mechanical properties, and is driven by advanced microscopy. Current challenges are around hot-formability and weldability which can be overcome by advancements in conventional thermo-mechanical processing or additive manufacturing. This talk will summarize our recent progress in microstructural engineering and microscopy of superalloys. Advancements in processing of Alloy 718 and René 41 unlock enhanced strength and eliminate cracking. Innovative electron beam additive manufacturing of Alloy 738 promotes in-situ γ' precipitation.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Characterization, Phase Transformations


Cluster Variation Model of Phase Behavior in Heusler-forming Alloy Systems
Competitive Partitioning and Decomposition Evolution in Nanocrystalline Alloys
Cross-Slip and Work-Hardening in Short-Range Ordered FCC Alloys
Effect of Bulk and Local Phase Transformation on Deformation Mechanisms
Interfacial Spinodals
Intrinsic Phase Stability and Continuous Phase Transformations in TiAlZrN Ultra-hard Nitride Coatings
Magnetically Driven Short-range Order in the CrCoNi System
Microstructural Engineering of Ni-based Superalloys Processed by Conventional and Additive Manufacturing
Phase-field Modelling of Transformation Pathways and Microstructural Evolution in MPEAs (Multi Principle Element Alloys)
Phase Competition in the Two Steps Continuous Phase Transformation during Solidification of Terbium
Short-range Clustering and Ordering Evolution of Ni-22Cr-13Mo Alloy
Structural Transformations Driven by Irradiation in the High Defect Density Limit
Study of Precipitation Behavior of High-Cr Ni-based Filler Metals Using In-situ S/TEM
Thermodynamics of the Invar Transition: Phonons vs. Magnetism

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