| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloy Development for Energy Technologies: ICME Gap Analysis
|
| Presentation Title |
Phase Field Dislocation Dynamics Modeling of Shearing Modes in Ni2(Cr,Mo,W)-containing HAYNES® 244® Superalloy |
| Author(s) |
Thomas Mann, Michael Fahrmann, Marisol Koslowski, Michael Titus |
| On-Site Speaker (Planned) |
Thomas Mann |
| Abstract Scope |
Ordered intermetallic precipitates used as the primary strengthening phases in Ni-based superalloys have unique dislocation dynamics due to the symmetry of the lattice and energetics of dislocation motion. We first establish the generalized stacking fault energy (GSFE) surface of the body-centered orthorhombic Ni2(Cr,Mo,W) precipitates in HAYNES® 244® utilizing Density Functional Theory. The GSFE surface was then input into Phase Field Dislocation Dynamics simulations to determine the Peierls-Nabarro barrier for dislocation motion in the precipitate, the threshold stress for dislocations to penetrate the precipitate interface, and the critical stress required for Orowan bowing through a deformable precipitate. These results will be compared to existing semi-analytical models in the presentation. Finally, we will present preliminary work on multi-precipitate simulations which indicate a strong dependence of precipitate variant orientation and spacing on critical shearing stresses. We will conclude by presenting alloy design strategies that optimize GSFE to further increase the critical shear stress. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, High-Temperature Materials, |