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Meeting MS&T21: Materials Science & Technology
Symposium Deformation-induced Phase Transformations
Presentation Title Engineering Microstructures for Conventionally and Additively Manufactured Ni-based Superalloys
Author(s) Felix Theska, Nima Haghdadi, Sophie Primig
On-Site Speaker (Planned) Felix Theska
Abstract Scope 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.


Accounting for Phase Transformation in Plastic Anisotropy Modeling of SS316L
Analysis of Stress State of Plastic Medium Influence on Structural Transformations in Low-alloy Steels
Ausforming of Ferrium M54 Ultra-high Strength Steel
Engineering Microstructures for Conventionally and Additively Manufactured Ni-based Superalloys
Influence of 3D Microstructure on Deformation-induced Martensitic Transformation Studied by In Situ High-energy Diffraction Microscopy and Crystal Plasticity Modeling
Intrinsic Coupling between Deformation Twinning and Phase Transformation in NiTi Shape Memory Alloys and Metastable Beta Ti-alloys
Localized Phase Transformation at Stacking Faults and the Corresponding Alloy Design Strategy
P1-18: Bimetallic Billets for Magnesium-thermal Production of High Quality Sponge Titanium
P1-19: High-cut Steel Property Researches For Taps’ Manufacture
Solid Phase Plasticity Mechanisms in Metals and Rocks during Shear Deformation
Wire Size Effect on the Nucleation of Fatigue Cracks Near Non-metallic Inclusions in Superelastic Nitinol

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