About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
The Effect of Loading Rate on the Hydrogen Environment-Assisted Cracking Behavior in a Ultra-High Strength Martensitic Stainless Steel |
| Author(s) |
Javon Smith, James Burns, Zach Harris |
| On-Site Speaker (Planned) |
Javon Smith |
| Abstract Scope |
The dependence of hydrogen environment-assisted cracking (HEAC) behavior on applied loading rate (dK/dt) was investigated for Custom 465-H900 using a slow-rising stress intensity (K) methodology at rates from 0.5 to 15 MPaVm/hr. Linear elastic fracture mechanics (LEFM) experimentation yielded susceptibility metrics such as stress intensity thresholds for crack initiation (Kth), crack growth rates (da/dt), and resistance curves that collectively indicated a dependence of HEAC susceptibility on loading rate. Permutations in susceptibility observed via these cracking metrics suggest transitions in the dominant cracking mechanism as loading rate varies, with stress-controlled and strain-controlled fracture processes exchanging prominence. The significance of these results is to demonstrate the conservatism and efficiency of a rising-K fracture mechanics methodology and to provide further insight into the influence of loading rate on environmentally assisted cracking behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Iron and Steel, |