About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Hydrogen Effects on Mechanical and Toughness Properties of Pipeline Steels |
Author(s) |
Xin Pang, Su Xu |
On-Site Speaker (Planned) |
Xin Pang |
Abstract Scope |
This paper reviews commonly used hydrogen charging methods and effects of hydrogen on Charpy toughness. Preliminary ex-situ Charpy tests of electrolytically pre-charged specimens of three pipe steels were performed at room temperature. The gaseous hydrogen charging method is directly applicable to hydrogen pipelines but the lack of testing capability has limited its utilizations in R&D and qualification. The electrolytic charging method can be convenient and appropriate for investigating the effects of hydrogen especially if correlations between current density or potential and gaseous pressure are established. Preliminary experimental results have shown that the Charpy absorbed energy (CVN) of the electrolytically pre-charged specimens were lower than those of uncharged specimens by 8-20% for the steels investigated. Based on the load-deflection curves, the effects of hydrogen on Charpy toughness were to facilitate fracture initiation from the notch and accelerate fracture propagation after fracture initiation. In-situ Charpy and fracture toughness testing at slow rates would be more suitable for pipeline applications than impact testing. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Iron and Steel, Other |