| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Assessing the Susceptibility of Existing Pipelines to Hydrogen Embrittlement |
| Author(s) |
Tim Boot, Ton Riemslag, Elise Reinton, Carey Walters, Ping Liu, Vera Popovich |
| On-Site Speaker (Planned) |
Tim Boot |
| Abstract Scope |
With fossil fuels being phased out and growing global interest in a hydrogen economy, there is demand for re-purposing existing pipelines for transportation of hydrogen gas. In this study, in-situ Slow Strain Rate Tensile (SSRT) tests were performed in nitrogen and in hydrogen environments at varying pressures (0 - 100 bar) to evaluate hydrogen’s effects on the mechanical properties of an X60 base metal (polygonal ferrite/pearlite) and its girth weld (acicular ferrite/pearlite). A novel type of hollow tensile sample was designed that acts as a pipe and can be loaded with high pressure gas internally. A substantial decrease in ductility and toughness was identified for both base and weld metals even at low hydrogen pressures. Fracture surfaces were observed using SEM, showing micro-void coalescence as well as quasi-cleavage fracture characteristic of hydrogen embrittlement (HE). Susceptibility to HE was also observed in the form of secondary longitudinal and internal transverse cracks. |
| Proceedings Inclusion? |
Planned: |