| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
N-6: Effect of Cyclic Hydrogen Charging on Shot-Peening Steel with Surface Compressive Residual Stresses |
| Author(s) |
Jia-Huei Tien, David F. Bahr, Megan Reger, David Johnson |
| On-Site Speaker (Planned) |
Jia-Huei Tien |
| Abstract Scope |
To explore the recovery of mechanical properties during cyclic hydrogen charging, our study focused on 1070 steel treated with shot peening to induce biaxial compressive residual stress at the surface. By employing techniques of X-ray diffraction and nanoindentation, we found a slight change in modulus after electrolytic hydrogen charging and recovering after hydrogen releasing, while resulting in a permanent decrease in compressive stress in peened samples but still hardening the surface. A decrease in X-ray peak breadth indicates that the interplay between elastic stresses and solute hydrogen led to local dislocation annihilation and re-organization of the dislocation structure not only during hydrogen charging but hydrogen releasing from the specimen. As for the specimen with lower compressive residual stress by altering shot-peening parameters, there is no observable reduction in FWHM. |