| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Metastable Phases and Phase Equilibria: Towards Designing the Next Generation of Alloys
|
| Presentation Title |
Resetting Mechanical Property of 9Cr Steel by Segregation Engineering |
| Author(s) |
Minseok Kim, Sang Jun Kim, Ji Won Kim, Eun Soo Park |
| On-Site Speaker (Planned) |
Minseok Kim |
| Abstract Scope |
There is a limit to reducing greenhouse gas emissions through reduction of materials, although only when materials are reused it can be effectively reduced. Therefore, this study focused on developing a novel reusable alloy by restting the mechanical properties. We selected the Mn element as an alloying element considering the phase stability and segregation tendency in the 9Cr steel, which is widely used as a structural material. After homogenization and air cooling, the steel is fully martensite structure. In the subsequent tempering process, partial austenitization occurs by the Mn element, which has been segregated to the grain boundary and lower the austenitization temperature. Finally, we find out that these meteastable austenites exhibit TRIP behavior. As a result, the strength of the 9Cr steel greatly increased with no significant reduction in elongation. Furthermore, we designed a heat treatment process for resetting mechanical properties by controling the reversible local phase transformation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |