About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Crack Initiation From Charpy-Type Specimens and Diffusion Coefficient of an X70 Pipe Steel Under Electrochemical Hydrogen Charging |
| Author(s) |
Xin Pang, Su Xu, Jian Li |
| On-Site Speaker (Planned) |
Xin Pang |
| Abstract Scope |
Hydrogen embrittlement (HE) has been a main material issue for transporting gaseous hydrogen or hydrogen/natural gas blends using pipelines. In this work, the HE effect on Charpy specimens of an X70 pipe steel was investigated using slow-rate three-point bend testing with in-situ electrochemical hydrogen charging. The three-point bend tests were interrupted near the maximum load to investigate the hydrogen effect on crack initiation process. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) characterizations were performed to correlate the effect with the microstructural features such as grain boundary and crystallographic orientation of the steel on cross-sections close to the mid-thickness of the specimens. To help understand the hydrogen diffusion dynamics near the crack tip, the apparent diffusion coefficient of hydrogen in the X70 steel was measured using Devanathan-Stachurski permeation technique. The permeation transients obtained can be used to develop numerical simulation models predicting hydrogen diffusion process in the steel. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Environmental Effects |