| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Probing the Mechanism Underlying the Interplay Between the Microscale Plastic Flow and the Atomic-scale H Diffusion Through Concurrent Atomistic-continuum Simulations |
| Author(s) |
Thanh Phan, Yipeng Peng, Liming Xiong |
| On-Site Speaker (Planned) |
Thanh Phan |
| Abstract Scope |
The microstructure of oil pipeline steel is polycrystalline due to the presence of grain boundaries (GBs) in them. The performance of them in corrosive environments is largely dictated by the interplay between the hydrogen (H) diffusion, the dislocation slip, and their interactions with the GBs. However, the slip-GB interaction in the presence of H and the subsequent cracking remains not fully understood up to date. It is challenging to simultaneously resolve the collective dislocation motions away from the GBs together with the H diffusion near the atomically structured GBs using any single-scale techniques. To address this challenge, taking bcc iron as a model material, here we present a concurrent atomistic-continuum (CAC) computational analysis of the interaction between a microscale dislocation slip and a H-charged GB. The obtained results can be used to map the atomistic deformation physics of polycrystalline oil pipeline steel to their overall performance in aqueous environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Modeling and Simulation, Mechanical Properties |