About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Simulation of Dislocation Slip Bands during Fatigue of a Precipitate Strengthened Nickel-based Superalloy |
Author(s) |
Miguel Espadero, Hector Basoalto |
On-Site Speaker (Planned) |
Miguel Espadero |
Abstract Scope |
This study focuses on the simulation of dislocation slip bands under fatigue loading in a two-phase alloy. Specifically to investigate the influence of variations in precipitate dispersion parameters on the fatigue behaviour of a γ' nickel-based superalloy. To achieve this, a continuum dislocation dynamic (CDD) approach is developed to simulate slip band evolution. Predictions are presented for a range of temperatures, accounting for changes in the γ' distributions that are representative of those found within a powder disc nickel-based superalloy. Bauschinger effects are observed due to the reversal of accumulated plasticity on the slip systems, as new sources are activated by changes in the load direction, and existing dislocations from the previous load shear back across the domain. Scatter in fatigue behaviour is observed at each temperature due to variations in the amount of accumulated plasticity on different slip bands, which are linked to dislocation interactions with γ' particles. |
Proceedings Inclusion? |
Planned: |