About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Phase Transformations and Microstructural Evolution
|
Presentation Title |
Influence of Al2O3 on Crystallization Behavior of Mold Slag Film Based on Soret Effect |
Author(s) |
Qiuping Li, Peng Cheng, Guanghua Wen, Ping Tang, Zibing Hou, Xinyun Mo |
On-Site Speaker (Planned) |
Qiuping Li |
Abstract Scope |
In the continuous casting of crack-sensitive steel, high-basicity mold flux faces the dilemma between lubrication and heat control. The Soret effect is at a 700°C temperature gradient between the mold and the shell. It causes element differentiation of the slag film and changes the crystallization direction, potentially solving the contradictory problems. This study used DHTT to simulate the above thermal environment and combined SEM and EMPA to investigate the effect of Al2O3 on the crystallization behavior of slag film. The results showed that without Al2O3, 3CaO·2SiO2·CaF2 precipitates near the solidification line. Adding 3wt% Al2O3 caused Na and Si elements to migrate to the low-temperature end, promoting Na2O·Al2O3·2SiO2 and 3CaO·2SiO2·CaF2 growth from low to high temperatures. The fluctuations of Na, Al, and Si elements are consistent. This indicates that Al2O3 is the network former ([AlO4]-), which connects with Na and SiO3-chain to precipitate Na2O·Al2O3·2SiO2. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Aluminum, Iron and Steel |