About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
On the Role of Elemental Partitioning Towards Hydrogen-Trapping at Different Microstructural Features in a Deformed Pearlitic Steel |
| Author(s) |
Mainak Saha, Zehao Li, Rintaro Ueji, Akinobu Shibata, Taisuke Sasaki |
| On-Site Speaker (Planned) |
Mainak Saha |
| Abstract Scope |
Improving Hydrogen embrittlement (HE)-resistance is important to expand the applications of high-strength steels. High-strength deformed pearlitic steels show excellent HE-resistance, presumably due to strong hydrogen (H)-trapping at ferrite/cementite interfaces (FCI) which prevent H-accumulation at potential crack initiation sites. In this work, we examined caliber-rolled Fe-0.53C-1.48Si-0.70Mn-0.76Cr and Fe-0.8C-0.7Mn (wt.%) pearlitic steels for the presence of strong H-trapping sites using 3D atom probe (3DAP), focusing on the elemental partitioning effects.
3DAP samples are charged with deuterium (H-isotope) to distinguish between sample and background H. Deuterium is enriched at FCI, ferrite cell boundaries and low-carbon (~15 at.%) cementite indicating that these features serve as strong H-trapping sites. Pronounced segregation of deuterium at relatively rougher sections compared to flatter sections of FCI, irrespective of Cr and Si additions indicates that H-trapping is affected by deformation-induced strain and not elemental partitioning. Insights from these results are important to improve HE-resistance of high-strength steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, Environmental Effects |