About this Abstract |
Meeting |
2020 AWS Professional Program
|
Symposium
|
2020 AWS Professional Program
|
Presentation Title |
Influence of Hydrogen on the Softened HAZ in Various Carbon Steel Welds |
Author(s) |
Namhyun Kang, Yeong-Do Park, Myeonghyun Kim, Yangdo Kim, Dae-Geun Nam, Stephen Liu |
On-Site Speaker (Planned) |
Namhyun Kang |
Abstract Scope |
Many studies have investigated the hydrogen induced stress cracking (HISC) properties of base metal (BM), fusion zone (FZ), and heat affected zone (HAZ), respectively. However, it is important to evaluate the HISC behaviour of the entire weldments because the actual weldments are applied with stress simultaneously during service. This study aims to investigate the role of the interaction of hydrogen and microstructures on the HISC for transverse welds containing BM, FZ, and HAZ. In-situ slow-strain-rate-testing (SSRT) with hydrogen charging was conducted for YS 360 and 550 MPa grade steel welds. The in-situ SSRT changed the fracture location from BM to HAZ for the transverse weldments. We investigated the hydrogen trapping site in HAZ and initiation-propagation of HISC for various steels. Although some weld microstructures or softened HAZ are harmless under normal conditions in air, they should be critically investigated in a hydrogen atmosphere. |
Proceedings Inclusion? |
Definite: Other |