| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
Understanding the Interplay Between Dislocation Slip, Hydrogen Clustering, GB Cavitation and Cracking in Hydrogen Embrittlement Through Atomistic-to-Mesoscale Simulations |
| Author(s) |
Liming Xiong, Thanh Phan, Yipeng Peng |
| On-Site Speaker (Planned) |
Liming Xiong |
| Abstract Scope |
To understand the how the additive manufactured (AM) metallic materials, which often contains a complex network of grain boundaries (GBs) and solidification dislocation cells, fail when exposed to hydrogen, we present a concurrent atomistic-continuum (CAC) simulation tool that can accommodate the mesoscale dislocation cell wall structures, the nanostructured GBs, as well as the atomic scale hydrogen diffusion along the dislocations and GBs all within one model. The resulting CAC has a unique capability of scaling up in length for modeling the collective behavior of a large population of long dislocation lines at the mesoscale but retaining an atomistic resolution at the GBs and dislocation cores. Our preliminary CAC simulation results show that the hydrogen embrittlement of AM metallic materials does not occur through any commonly recognized HELP, HEDE, or AIDE alone, but a combination of HELP and HEDE with a plasticity induced clustering of hydrogen (PICH) in between. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Environmental Effects, Additive Manufacturing |