| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Investigating the Roles of Microstructure on High-temperature Creep Responses of Steels |
| Author(s) |
Arul Kumar Mariyappan, Ricardo Lebensohn, Laurent Capolungo |
| On-Site Speaker (Planned) |
Arul Kumar Mariyappan |
| Abstract Scope |
The engineering components of ferritic-martensitic grade-91 steel alloys are widely used in energy sectors. These components are mostly operated at high temperature and low-to-moderate stresses and thus lead to thermal creep. Quantifying the effects of microstructure on high-temperature creep behavior is critical to minimizing the risks of failure. In this work, an advanced constitutive model within a mesoscale full-field elasto-viscoplastic Fast Fourier Transform (EVPFFT) framework is developed to capture the effect of stress, temperature, and microstructure on the creep responses of grade-91 alloy. Using this framework, the roles of the initial microstructure described in terms of dislocation density, precipitate content, and grain size on the creep responses are investigated. The effect of initial microstructure on the steady-state creep-rates and time-to-failure is found to vary significantly with stress and temperature. Further, using the model predictions, the variability in the experimental creep data is rationalized based on differences in the initial microstructure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Modeling and Simulation, ICME |