| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Heat Treatment Design of Inconel 740H Superalloy for Microstructure Stability and Creep Properties Enhancement |
| Author(s) |
Dong-Min Kim, Cheol-Hyeok Yang, Hyun-Uk Hong, Hi-Won Jeong |
| On-Site Speaker (Planned) |
Cheol-Hyeok Yang |
| Abstract Scope |
In this study, three heat treatment conditions selected from various heat treatment candidates for Inconel 740H, which are considered as materials for in A-USC steam turbines, were exposed to long-term thermal condition at 750℃ up to 5,000 hours. The stability and mechanical characteristics of heat-treated microstructure were examined, and the optimal heat treatment to maximize creep property was derived through creep test (750℃/270 MPa). It was confirmed that the content of Cr was concentrated at the boundary of MC carbide without a specific orientation relationship at 750°C/270 MPa creep, and this was the result of phase transformation by the reaction of MC + γ → M23C6 + γ'. Thus, MC carbide has high resistance to cracks because its temperature and stress during creep contribute to decomposition for phase transformation rather than initiation. Therefore the higher the fraction of the MC carbide, the more advantageous it is to the creep property. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, |