Project Details
Projekt
Influence of H on phase stability and mechanical properties of single-crystal Ni-based superalloys (T13*)
Subject Area
Thermodynamics and Kinetics as well as Properties of Phases and Microstructure of Materials
Term
since 2024
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 190389738
The urgent need to decarbonise our society leads to core challenges in the transition from fossil to H-based fuels that affect also gas turbines for power generation. It is becoming increasingly critical that hydrogen (H) is integrated into materials design principles and in lifetime predictions of engineering parts. The proposed transfer project T13 picks up thisresponsibility for the case of H in single-crystal Ni-based superalloys. The scientific challenges are manifold and range from the uptake and diffusion of H to the interaction with particular alloying elements, including potential hydride formation, to H accumulation at defects, leading to possible H embrittlement (HE). The situation is even more complicated as the uptake and influence of H will strongly vary across the wide range of service temperatures and creep life of turbine blades. At this point, it is completely unclear if, and is so in which way, the design of single-crystal Ni-based superalloys should be modified to avoid potential detrimental effects of H-based fuels. The complexity of this socially and politically crucialsubject can only be addressed by a group of scientists with complementary expertise as in T13. This group combines creep experiments of H-charged samples, H-sensitive scale-bridging characterization and large-scale atomistic simulations with accurate accounting for H-metal interactions. The required experimental and computational techniques have been established in the SFB/TR103 and will be transferred to this new subject in T13. This team is completed by the application partner Thermo-Calc Software that brings in world-leading expertise in thermodynamic modelling of Ni-based superalloys in their full technological complexity. This connection is critical as the design of superalloys by materials scientists and engineers relies heavily on thermodynamic databases as provided by Thermo-Calc Software. The proposedtransfer project T13 will extend the databases in order to enable materials design for running gas turbines with H-based fuels. The T13 goals shall be reached by working packages around scientific themes along the full cycle of creep experiments, experimental characterizations, atomistic simulations and thermodynamic modelling. The focus is on the influence of H on the microstructure with respect to γ/γ’ partitioning and hydride formation, the interaction of H withdifferent alloying elements as well as the influence of H on creep. This project builds on the intense collaborations between the PIs over the time of the SFB/TR103 and is only feasible with the synergy across institutions and expertise between ICAMS, MPIE, LWW, and TCS.
DFG Programme
CRC/Transregios (Transfer Project)
Subproject of
TRR 103:
From Atoms to Turbine Blades - A Scientific Approach for Developing the Next Generation of Single Crystal Superalloys
International Connection
Sweden
Applicant Institution
Ruhr-Universität Bochum
Business and Industry
Thermo-Calc Software AB
Stockholm Technology Park
Stockholm Technology Park
