|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Microstructural Damage Evolution during High-temperature Creep in Nickel-based Single Crystal Superalloys: A Phase Field Study
||Harikrishnan Rajendran, Jean-Briac le Graverend
|On-Site Speaker (Planned)
Ni-based superalloys have emerged as the materials of choice for high-temperature applications due to their significant resistance to loading under static, fatigue, and creep conditions, in particular when the operating temperatures are beyond about 800°C. The lifetime of these materials is directly connected to the integrity of the strengthening phase, namely gamma’. Therefore, understanding how the mechanical behavior of this phase softens with the evolution of damage is essential. Thus, a phase-field model coupled with a classical Continuum Damage Model, viz. a Rabotnov-Kachanov’s formulation, helps to theoretically understand and better explain the complex microstructural changes occurring during the tertiary creep stage, such as the topological phase inversion. In practice, the internal variable describes the evolution of damage during creep loading. The numerical simulations are in agreement with the SEM observations and give further insight into failure mechanisms.
||Planned: Supplemental Proceedings volume