| Abstract Scope |
Effective homogenization is critical to attaining the chemical and microstructural uniformity necessary to achieve consistent and repeatable properties in advanced superalloys. Traditional homogenization process design often does not fully account for the variability in chemistry and microstructure resulting from solidification processes. Consequently, conventional homogenization cycles frequently encounter challenges such as local liquation, inadequate equalization of chemical segregation, and incomplete dissolution or even enhancement of detrimental microstructural features; all contributing to suboptimal mechanical performance. This study presents an integrated computational-experimental approach aimed at optimizing homogenization cycles using the complex nickel-based superalloy ATI 718Plus® Alloy as a model system. Thermodynamic simulations, utilizing CALPHAD methodologies via Thermo-Calc and DICTRA, were performed to predict phase stability, microsegregation dissolution kinetics, and diffusional behavior. These simulations were both informed by and validated using targeted experiments and characterization. The results demonstrated significant improvements in chemical and microstructural uniformity. This methodology offers broad applicability beyond alloy ATI 718Plus® Alloy, enabling optimized processing and enhanced mechanical performance of segregation prone superalloys. |