| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Hydrogen Trapping and Hydrogen Embrittlement in Hybrid Steel Strengthened by Dual Precipitates |
| Author(s) |
Hung-Wei Yen, Chin-En Chou, Yi-Hsuan Sun, Steve Woei Ooi, Ranming Niu, Chao Huang, Eason (Yi-Sheng) Chen, Julie M. Cairney |
| On-Site Speaker (Planned) |
Hung-Wei Yen |
| Abstract Scope |
Hybrid steel, a new grade of strong steel developed by OVAKO, exhibits an extremely high hardness of HRC55 due to effects of precipitation strengthening from NiAl-B2 particles and V4C3 carbides under peak aging. The current work investigates hydrogen embrittlement and hydrogen trapping in the peak-aged hybrid steel. Our thermal desorption analyses show an extraordinary concentration of trapped hydrogen in this steel. Besides, the concentration of non-diffusible hydrogen is approximately 16 ppmw. This is explained by the trapping effects from dual precipitates. However, in slow-strain rate tensile tests, it is found that most non-diffusible hydrogen is harmful. This steel is exempted from embrittlement when the concentration of non-diffusible hydrogen is lower than 4.0 ppmw. In summary, some irreversibly trapped hydrogen at stress-free state could be active under some stressed states. Hydrogen, active under a stress, can cause hydrogen embrittlement in practice. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |