About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Effect of Compressive Residual Stress on Hydrogen Permeability in Shot-Peened Steel Under Cathodic Charging |
| Author(s) |
Jia-Huei Tien, Ana S Armendariz, David R Johnson, David F Bahr |
| On-Site Speaker (Planned) |
Jia-Huei Tien |
| Abstract Scope |
Hydrogen embrittlement is a significant challenge in hydrogen-based energy systems, due to the ingress of hydrogen atoms into metal lattices, leading to brittleness and cracking. This study examined the effect of cathodic hydrogen charging on 1070 steel subjected to shot peening, a surface treatment that induces biaxial compressive residual stress. TDS revealed that shot-peened samples retained approximately twice the hydrogen content compared to unpeened one under identical charging conditions. To better understand the kinetic prospective of hydrogen ingress, hydrogen permeability was evaluated using an H-type electrochemical cell, provided insight into hydrogen transport and the dynamic interaction between hydrogen and the evolving microstructure. Changes in residual stress and dislocation structures were then evaluated by XRD, SEM and TEM. Preliminary results revealed a permanent reduction in compressive residual stress and decrease in X-ray peak breadth indicated dislocation annihilation and microstructural reorganization, likely driven by interactions between residual stress and solute hydrogen. |