| 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 |
Investigating Deformation Mechanisms in a Coarsening Resistant Ni-base Superalloy with "Compact" γ'-γ" Coprecipitates |
| Author(s) |
Semanti Mukhopadhyay, Hariharan Sriram, Richard DiDomizio, Robert Hayes, Christopher Zenk, G.B. Vishwanathan, Yunzhi Wang, Michael Mills |
| On-Site Speaker (Planned) |
Semanti Mukhopadhyay |
| Abstract Scope |
There is a constant demand for high temperature turbine disk materials in high-throughput gas turbine wheels at temperatures above 650°C. A novel strategy to ensure superior creep strength in the Ni-base superalloys used in this application is to develop a “compact” coarsening resistant morphology of the strengthening phases-γ′&γ″. The coarsening resistance of this morphology, consisting of a layer of γ″ on all the (001) faces of a cuboidal γ' precipitate, arises from the effectiveness of the γ″ precipitate in blocking Al diffusion flux.
The creep properties and consequent deformation mechanisms operative in this IN718-based superalloy developed will be discussed. Results from various high-resolution characterization techniques will be utilized to correlate the manifestation of operative deformation mechanisms across different length scales. An attempt will be made to study the 3D nature of the faults and solute segregation. The experimental findings will be complemented with predictions from a microscopic phase field model. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |