About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Damage Mechanisms of High Temperature Alloys
|
Presentation Title |
Mechanistic Modeling of Thermal Creep Response of 347H Stainless Steel: Effect of Microstructure and Chemistry |
Author(s) |
Arul Kumar Mariyappan, Ricardo Lebensohn, Laurent Capolungo |
On-Site Speaker (Planned) |
Arul Kumar Mariyappan |
Abstract Scope |
Austenitic stainless steels are widely used in high-temperature applications like nuclear and fossil energy industries. Developing a numerical framework to capture the creep and strain hardening behavior of steels is important to enhance its applicability. In this work, a mechanistic constitutive model within a full-field elasto-visco-plastic Fast Fourier Transform (EVPFFT) framework is developed to capture the effect of stress, temperature, microstructure and chemistry on material responses. Thermally-activated dislocation glide and climb, and vacancy diffusional creep mechanisms are considered. Using this framework, uniaxial stress-strain and thermal creep responses of 347H stainless steel for wide range of temperature is predicted and validated against the experimental measurements. Ashby-Weertman deformation mechanisms maps are developed for different initial microstructures and chemistry. The relative roles of the different deformation mechanisms (dislocation glide, climb and diffusional creep) on the predicted creep responses are discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, Iron and Steel |