About this Abstract |
| Meeting |
11th International Symposium on Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
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| Symposium
|
Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
|
| Presentation Title |
Considerations for Homogenizing Alloys |
| Author(s) |
Paul D. Jablonski, Stoichko Antonov, Martin Detrois |
| On-Site Speaker (Planned) |
Paul D. Jablonski |
| Abstract Scope |
Chemical inhomogeneities result naturally as a by-product of alloy solidification. This is particularly problematic for nickel-based superalloys due to their complex formulation, significant segregation induced melt point depression and the incorporation of refractory elements. Thermal or thermo-mechanical treatments are often used to reduce these inhomogeneities. The questions include how to achieve this, what level of homogenization is appropriate and what, if any, detrimental effects might occur as a result of the treatment. If the chemical inhomogeneity profile is known a-priory, kinetic modeling software such as DICTRA (Diffusion Controlled TRAnsformations) can be used to model the homogenization kinetics of an alloy. Critical aspects are related to the incipient melt point and how it changes with treatment temperature and time. In this study, the Scheil module within the Thermo-Calc software was used to predict the as-cast segregation of alloys. The segregation profiles were read into DICTRA to refine the homogenization heat treatment of the alloys. The thermodynamic and kinetic modeling of the computationally predicted heat treatment and microstructure, and subsequent experimental verifications on real castings are presented. A discussion of the decision criterion along with considerations of potential unintended consequences is also presented. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |