| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
On the Stress Corrosion Cracking Behavior of a Precipitation-hardened Martensitic Stainless Steel under Atmospheric Exposure Conditions |
| Author(s) |
Zachary D. Harris, Keiko Amino, Patrick J. Steiner, James T. Burns |
| On-Site Speaker (Planned) |
Zachary D. Harris |
| Abstract Scope |
The stress corrosion cracking (SCC) behavior of the precipitation-hardened martensitic stainless steel, Custom 465-H900, under atmospheric exposure conditions was assessed via a slow-rising stress intensity (K) testing framework coupled with electrochemical potential measurements. Three experimental configurations were evaluated in this study using 0.6 M NaCl solution as the bulk electrolyte: (1) continuous misting, (2) direct wicking of solution into the specimen starter notch, and (3) full immersion. Experiments revealed that the threshold stress intensity was reduced in atmospheric environments relative to full immersion testing, with the following order from least to most susceptible: full immersion > misting > wicking. Conversely, the Stage II crack growth rate was found to be nominally identical across all tested environments. These results are assessed in the context of proposed hydrogen embrittlement mechanisms, with particular focus on the contributions of the electrolyte geometry and open circuit potential evolution during testing to the local crack-tip conditions. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |