About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Steels in Extreme Environments
|
Presentation Title |
The study of microstructure evolution during tempering heat treatment in 9-12Cr heat resistant steel. |
Author(s) |
Bong Cheon Park, Sung-Dae Kim, Jae Hoon Jang, Nam Hyun Kang |
On-Site Speaker (Planned) |
Bong Cheon Park |
Abstract Scope |
Ferritic/Martensitic heat resistant steel is mainly considered for use in steam turbines of power plants due to its excellant pysical properties and significant creep strength. To improve the efficiency, operation at higher temperatures and pressures is essential. Consquently, materials that maintain stable microstructures and exhibit high creep resistance under these conditions are requried.
Precipitation hardening is a key mechanism to enhace creep strength. precipitates in this study formed during tempering include M23C6, LAVES, and MX. These contribute to maintaining a stable microstructure by acting as an obstacle to the movement of grain boundaries and dislocations.
This study investigates microstructure properties during tempering. The alloy, based on 10.2Cr-Mo-W-V-Co-C-Nb, underwent tempering conducted at 670°C for upto 300 hrs after 1170°C for 5hrs. Microstructure changes and precipitates quantification according to heat treatment time were analyzed by TEM. Precipitation simulations were conducted using MatCalc 6, and the results were compared with experimental data. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Characterization, Computational Materials Science & Engineering |