| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Practical Tools for Integration and Analysis in Materials Engineering
|
| Presentation Title |
Crystal Plasticity Model for Single Crystal Ni-based Superalloys: Capturing Orientation and Temperature Dependence of Flow Stress |
| Author(s) |
Satyapriya Gupta, Curt A. Bronkhorst |
| On-Site Speaker (Planned) |
Curt A. Bronkhorst |
| Abstract Scope |
We develop a dislocation density based crystal plasticity model to capture the micromechanical behavior of γ' strengthening nickel-based superalloys. The model presented here accounts for elasticity, plastic deformation, and hardening behavior of both γ and γ'. The model includes multiple strengthening mechanisms such as Orowan stress, evolving slip resistance caused by dislocation interactions, and γ' structural contribution to initial slip resistance. Interaction between γ and γ', a key feature of these alloys has been modelled in terms of back stress induced by dislocation pileup or looping around the large γ' precipitates. Antiphase boundary (APB) shearing is considered as the dominant deformation mechanism for shearable γ' precipitates. In addition to octahedral {111}<110> slip, the model also accounts for cube slip systems {100}<110> which are known to be instrumental in γ' shearing. The model is tested against an independent set of single crystal experimental data available for CMSX-4 and MD2. |
| Proceedings Inclusion? |
Planned: |