| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Modeling the Dependence of Microstructural Evolution on the Crystallographic Orientation in Ni-based Single Crystal Superalloys |
| Author(s) |
Harikrishnan Rajendran, Jean- Briac le Graverend |
| On-Site Speaker (Planned) |
Harikrishnan Rajendran |
| Abstract Scope |
The structural components made of Ni-based single crystal superalloys, mostly turbine blades with complex geometries, has its exceptional properties significantly dependent on the microstructural integrity within the 5-degree tolerance for crystallographic misorientation. The blades are usually cast <001> crystallographic direction upwards. The present study, using realistic phase-field simulations, will demonstrate the dependence of perfect <001>, <011>, <111> crystallographic orientations and deviations from perfect orientations on the directional coarsening (rafting) of γ’ precipitates during high-temperature/low-stress creep conditions. The insights from this study will help investigate and compare the stability of various crystal orientations. We will also present the phenomenological formulations in our phase-field model such as the constrained lattice misfit, viz. the γ/γ’ lattice misfit during deformation, needed for such realistic predictions during creep. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |