| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales III
|
| Presentation Title |
A Physics-based Crystal Plasticity Constitutive Model Incorporating the Dynamic Strain Aging: Application to 347H Steel |
| Author(s) |
Veerappan Prithivirajan, Nathan Beets, M Arul Kumar, Bjorn Clausen, Ricardo Lebensohn, Laurent Capolungo |
| On-Site Speaker (Planned) |
Veerappan Prithivirajan |
| Abstract Scope |
Dynamic strain aging (DSA) is a process in which solute atoms diffuse toward the mobile dislocations, temporarily pinned at the obstacles. DSA causes additional drag on the dislocations, potentially leading to jerky dislocation motion, abrupt decrease in strain hardening, and eventually leading to instability in plastic flow. DSA depends on the temperature, strain rate, and the loading scenario. In this work, we develop a physics-based constitutive model for DSA within the crystal plasticity modeling framework to capture the DSA effect on mechanical behavior. To guide and validate the model, we performed in-situ neutron diffraction experiments during continuous mechanical loading with stress-hold (i.e., strain relaxation) at two different temperatures. Using the developed model, we simulate both simple thermal creep and complex stress-hold loading conditions in 347H steel at different temperatures to quantify the role of DSA. |