| About this Abstract |
| Meeting |
TMS Specialty Congress 2024
|
| Symposium
|
Accelerating Discovery for Mechanical Behavior of Materials 2024
|
| Presentation Title |
Solute Hydrogen Leads to Residual Stress Changes in Surface Engineered High Strength Steels |
| Author(s) |
David F. Bahr, Jia-Huei Tien, Megan R Reger, David R. Johnson |
| On-Site Speaker (Planned) |
David F. Bahr |
| Abstract Scope |
Processing of many engineering components containing tempered martensitic steels often involves surface engineering steps such as shot peening, laser shock peening, or induction heat treating. These processes create compressive stresses and high dislocation densities in the near surface region of parts. Shot peened quench and tempered steel with a hardness over 45 Rockwell C in the Almen strip geometry was measured for bow, electrochemically hydrogen charged, and then the residual stresses and hardness were measured using x-ray diffraction and nanoindentation respectively. For moderate intensities H charging led to a larger bow but lower surface stress. The hardness increases with solute hydrogen. X-ray diffraction verified that severe plastic deformation and compressive residual stresses caused dislocation recovery, leading to a more gradual but deeper residual stress profile on the part, in line with a hydrogen enhanced plasticity process where charged specimens with high compressive stresses were able to undergo dislocation rearrangement. |
| Proceedings Inclusion? |
Definite: Other |