| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Mechanistic Crack Growth in Ni-Based Superalloy Single Crystal γ-γ' Microstructure: the Role of Stress, Temperature and Cubic Slip |
| Author(s) |
Vasilis Karamitros, Duncan MacLachlan, Fionn P.E. Dunne |
| On-Site Speaker (Planned) |
Vasilis Karamitros |
| Abstract Scope |
Mechanistic short crack growth is studied in single crystal Ni γ' and γ-γ' microstructures. Microstructurally sensitive single crystal CPFEM/XFEM models are developed to study the conditions required for cubic slip and the potential for cubic crack growth to occur. Maximum slip and the stored energy (G) are the mechanistic drivers controlling the crack path and growth rate, respectively, in both γ and γ' phases. Single crystal γ' models for differing orientations at high stress and temperature are analysed to identify the most likely orientation that generates cubic slip, and subsequent γ-γ' models are designed based on these conditions. Microstructural γ-γ' crack growth is then studied at different stress levels and temperatures to investigate cubic and octahedral slip activation, and it is shown that combinations of orientation, stress and temperature can in principle lead to cubic crack growth. The conditions for which an experiment could demonstrate cubic cracking are presented. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Computational Materials Science & Engineering |