| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Quantitative Investigation on Hydrogen Embrittlement Susceptibility of Typical Pipeline Steel Through Hydrogen Permeation and Slow Strain Rate Tensile Tests |
| Author(s) |
Songyuan Ai, Lihua Wan, Mujun Long, Rundong Zhang, Yifan Li, Dengfu Chen, Danbin Jia |
| On-Site Speaker (Planned) |
Songyuan Ai |
| Abstract Scope |
Quantitative comparison of hydrogen embrittlement sensitivity between different pipeline steel types is an important basis for hydrogen pipeline material selection. In this work, the hydrogen embrittlement susceptibility of two typical pipeline steels has been quantitatively investigated by microstructure characterization, hydrogen penetration experiments and slow strain rate tensile tests. The results show that X80 steel is dominated by needle-fine shaped ferrite, while 5LB steel has coarse ferrite and pearlite composition. The hydrogen diffusion coefficients of 5LB and X80 are 1.67×10-5cm2·s-1 and 5.29×10-6 cm2·s-1, respectively. The hydrogen concentration of 5LB is 0.8 μmol·cm-3 higher than that of X80 after hydrogen charging for 3h. When the hydrogen concentration is 2.6 μmol·cm-3, the hydrogen embrittlement index of 5LB and X80 steels are 4.7% and 15.5%, respectively. The differences in hydrogen diffusion coefficient and internal hydrogen concentration due to microstructure are the key factors for the different hydrogen embrittlement susceptibility of the two pipeline steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Other |