| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Discovery and Insertion of Next Generation Structural Materials
|
| Presentation Title |
Microstructure and Mechanical Properties of ECAP Processed High Mn Steel Testing at 298 K and 77 K |
| Author(s) |
Young Hoon Jung, Beom Joon Kim, Hyeonseok Kwon, Marina Abramova, Hyoung Seop Kim, Nariman Enikeev, Ailreza Zagraran, Jung Gi Kim |
| On-Site Speaker (Planned) |
Young Hoon Jung |
| Abstract Scope |
With the increasing importance of cryogenic applications, the properties of high-Mn steels at cryogenic temperatures have been researched. High-Mn steels exhibit high strain hardening capabilities due to twinning at cryogenic and room temperatures. However, cryogenic conditions reduce stacking fault energy, causing martensitic transformation and increased brittleness. To overcome this issue, controlling the grain size of high-Mn steels has drawn attention. This method controls twin initiation, thereby controlling twin and martensitic transformation fractions. In this study, the Equal Channel Angular Pressing (ECAP) process was applied to control the grain size. Tensile tests revealed that a coarse grain size induces a brittleness at cryogenic temperatures. EBSD analysis showed that a larger grain size reduces twin initiation stress and increases slip length, raising the twin fraction and martensite formation due to increased detwinning by Shockley partial dislocations. These results indicate that grain refinement from ECAP effectively controls the cryogenic properties of high-Mn steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Phase Transformations, Mechanical Properties |