About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Influence of Hydrogen on Softened HAZ during In-situ Slow Strain Rate Testing in YS 550 MPa Grade Steel Welds |
Author(s) |
Namhyun Kang, Hanji Park, Cheolho Park, Junghoon Lee, Stephen Liu, Dae-Geun Nam |
On-Site Speaker (Planned) |
Namhyun Kang |
Abstract Scope |
The hydrogen-induced stress cracking (HISC) of the entire weldments needs to be evaluated because they are normally applied in various environments of stress and hydrogen. The study investigated the HISC reaction according to the microstructure and hardness distribution of the transverse welds for an ultra-high strength steel using in-situ slow-strain rate testing (SSRT). SSRT in the hydrogen-free environment resulted in the fracture of the base metal although the narrow-softened heat-affected zone (HAZ) was observed. However, during in-situ SSRT, the stress triaxiality was increased in the softened inter-critical HAZ and premature rupture was initiated by a hydrogen-promoted void and enhanced plasticity. |
Proceedings Inclusion? |
Planned: |