About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Damage Mechanisms of High Temperature Alloys
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Presentation Title |
A Physics-based Vacancy Diffusion Model to Capture High Temperature Creep Responses: Application to 316H Stainless Steel |
Author(s) |
Aritra Chakraborty, Mariyappan Arul Kumar, Ricardo Lebensohn, Laurent Capolungo |
On-Site Speaker (Planned) |
Aritra Chakraborty |
Abstract Scope |
The deformation response of a material under creep conditions at relatively high homologous temperatures and low stresses is primarily diffusion dominated. In this work, we capture the experimentally observed creep response of 316H under such conditions using a full–field physics-based point defect diffusion model, integrated within an elasto-viscoplastic fast Fourier transform based (EVPFFT) framework. The chemo-mechanical kinematic coupling is incorporated via the diffusion strain rate tensor (consisting of hydrostatic and deviatoric components) into the total strain rate using additive decomposition under the small-strain framework. The model not only captures Nabarro–Herring (lattice) and Coble (grain boundary) creep but also allows to correctly quantify the dislocation climb contribution using the actual vacancy concentration. Furthermore, we compare the scaling response of our diffusion model with stress, temperature, and grain size using 2D polycrystal simulations, and compare the results with that of reported on Nabarro–Herring creep. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, High-Temperature Materials, Mechanical Properties |