| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Towards a Future of Sustainable Production and Processing of Metals and Alloys
|
| Presentation Title |
Identifying Strong Hydrogen Trapping Site Induced by Deformation in Pearlitic Steels |
| Author(s) |
Zehao Li, Taisuke Sasaki, Rintaro Ueji, Yuuji Kimura, Akinobu Shibata, Tadakatsu Ohkubo, Kazuhiro Hono |
| On-Site Speaker (Planned) |
Taisuke Sasaki |
| Abstract Scope |
A high-strength deformed pearlitic steel exhibits excellent resistance to hydrogen embrittlement presumably because strong hydrogen trapping sites induced by deformation prevent hydrogen accumulation at potential crack initiation sites. In this work, we conclusively identified the strong deformation-induced hydrogen trapping site in the pearlitic steels by visualizing the deuterium distribution using atom probe tomography. Thermal desorption spectroscopy revealed a distinct hydrogen desorption peak at a high temperature of ~600 K in the deformed pearlite. Scanning transmission electron microscopy analyses showed that the deformation resulted in strain localization at the ferrite/cementite interfaces and the formation of a high density of dislocations. Atom probe tomography showed the strong segregation of deuterium, a natural isotope of hydrogen, at the interface in the deformed pearlitic steel, but not in the undeformed steel. Therefore, the strained ferrite/cementite interface provides a strong hydrogen trapping site in the deformed pearlitic steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, Mechanical Properties |