About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
2020 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-54: Dependence of Crystallographic Orientation on the Microstructural Evolution of Ni-based Single Crystal Superalloys-A Synergistic Experimental-computational Analysis |
| Author(s) |
Harikrishnan Rajendran, Jean- Briac le Graverend |
| On-Site Speaker (Planned) |
Harikrishnan Rajendran |
| Abstract Scope |
Single-crystalline turbine blades, made of Ni-based superalloys, are cast in <001> direction. Turbine blades exhibit strong material anisotropy, and there exists a significant microstructure-property relation with regards to their crystallographic orientation. From our high-temperature/low-stress creep experiments and the subsequent microstructural characterization, we observed that the orientation of γ’ precipitates and direction of rafting is at 45-degrees to the load axis in <011> but is parallel/ perpendicular to the load in <001>. Therefore, to elucidate the dependence of crystal orientation on the microstructure and properties, a new phase-field model capable of predicting cuboidal and rafted microstructures for <001> and <011> crystal-orientations is introduced. Statistical volume elements (SVE) were then generated from 3D phase-field microstructures having various γ/γ’ realizations. Finally, macroscale strain-controlled tensile tests were performed on the SVEs using a finite-element crystal plasticity framework. |
| Proceedings Inclusion? |
Undecided |