|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
||Superalloys by Computational Optimization: Phase Evolution and Creep Properties
||Tobias Gaag, Julius Weidinger, Jakob Bandorf, Christopher Zenk, Carolin Körner
|On-Site Speaker (Planned)
The multi-criteria optimization algorithm MultOpt is a powerful tool for computational alloy design based on CALPHAD calculations and models to describe properties such as the γ/γ′ lattice misfit of Ni-based superalloys. A series of four Ni-based superalloys was designed with MultOpt using a variation of the databases TCNI10 and TTNI8 and the property models for the γ/γ′ lattice misfit and the mass density as input. Experimental results of various thermophysical and mechanical properties, the accuracy of database and property model predictions and the alloys’ competitiveness will be presented. The new mass density model uses the molar mass of the alloying elements as input and predicts the mass density of low-density alloys more accurately, whereas both databases describe certain properties quite precisely while failing for others. The TCNI10-based alloys show more desirable physical properties such as a slower γ′-coarsening rate and less TCP phase formation but are inferior concerning high-temperature-low-stress creep.
||High-Temperature Materials, Mechanical Properties, Phase Transformations