| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Studying Dislocation - Prior Particle Boundary Interactions in Ni-Based Superalloy From Polycrystalline Discrete Dislocation Dynamics |
| Author(s) |
Divyesh Arjunbhai Mistry, Tawqeer Nasir Tak, Amuthan A. Ramabathiran, P. J. Guruprasad |
| On-Site Speaker (Planned) |
Divyesh Arjunbhai Mistry |
| Abstract Scope |
Nickel-based superalloys must operate in jet engines at high temperatures and pressure. Increasing the alloy content through the conventional route results in the formation of coarse grain microstructures, consequently rendering the material unamenable to improved hot workability for higher operating temperatures. However, powder metallurgy (PM) processing enhances hot workability by creating fine-grained microstructures. After PM and hot isostatic pressing (HIP), a network of brittle Prior Particle Boundaries (PPBs) forms, which ruptures during hot extrusion and forging, dispersing throughout the material and potentially promoting crack formation, thus impairing material ductility and toughness. 2D Discrete Dislocation Dynamics (DDD) framework is used to model PPB clusters in a polycrystalline material. The framework accounts for short-range dislocation interactions, dislocation-grain boundary, and dislocation-PPB cluster interactions through constitutive rules. Simulations reveal the role of PPBs on the mechanical behavior of the material. In particular, it highlights the development of residual stress in Ni-based superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Powder Materials, Modeling and Simulation |