About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Microstructure Evolution of HK40 and HP40 Heat Resistant Steels after Isothermal Aging |
| Author(s) |
Victor Manuel Lopez-Hirata, Eduardo Perez-Badillo, Maribel Leticia Saucedo-Muñoz, Hector Javier Dorantes-Rosales, Carlos Ferreira-Palma, Diego Israel Rivas-Lopez |
| On-Site Speaker (Planned) |
Victor Manuel Lopez-Hirata |
| Abstract Scope |
Thermo-Calc and experimental analyses were carried out for the as-cast and heat-treated HK40 and steel. The as-cast steels were aged at 800 and 900 °C for times up to 1000 h. As-cast and heat-treated specimens were characterized by XRD, HR-SEM, and Vickers hardness. Thermo-Calc Scheil analysis indicated the presence of an austenite matrix with the presence of Cr-rich M7C3, and M7C3 and (Nb,Ti)C carbides in the as-cast HK40 and HP40 steels, respectively, which is in agreement with experimental results. The aging at 800 and 900 °C produces the precipitation of M23C6 carbides, and M23C6 and (Nb,Ti)C carbides in the austenite matrix of the as-cast HK40 and HP40 steels, respectively. This precipitation process promotes an increase in hardness. Themo-Calc Prisma also predicted the precipitation of the same phases and the fastest growth kinetics of precipitation was at 900 °C for the as-cast HK40 and 1200 °C for the as-cast HP40 steel. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Phase Transformations |