About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Effect of Nickel and Chromium Contents on Hydrogen Embrittlement of High Strength Bolt Steel for Offshore Plants |
Author(s) |
Byungrok Moon, Sourav Kr. Saha, Jimin Nam, Changhoon Lee, Junho Chung, Namhyun Kang |
On-Site Speaker (Planned) |
Byungrok Moon |
Abstract Scope |
High-strength bolt steel that is directly exposed to low-temperature seawater has to ensure corrosion resistance and low-temperature impact toughness to seawater. And this material is medium carbon steel and is manufactured through rolling, quenching, and tempering heat treatment. The microstructure of this steel is tempered martensite. If this material does not have sufficient resistance to hydrogen embrittlement in low-temperature seawater, stress corrosion cracking caused by hydrogen embrittlement may be accelerated, and this causes a delayed fracture, which occurs suddenly rupture during material use. This study was conducted to investigate the cause of this delayed fracture and to improve the hydrogen embrittlement resistance. To evaluate resistance to hydrogen embrittlement according to elements Nickel and Chromium, an in-situ Slow Strain Rate Test and - 40 ℃ impact test are conducted with electrochemical charging. Finally, diffusivity and trap site concentration of hydrogen are introduced to explain these differences with electrochemical hydrogen permeation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Environmental Effects, Mechanical Properties |