Mold Flux for Casting High Al Steel

Name: Mold Flux
Diagram No.: 1173
Type of diagram: CCT
Chemical composition in weight %: See the table
Group: Slags
Note: CCT diagrams of mold fluxes with different Al2O3 contents.
The CCT diagrams of four series of mold fluxes are shown in Figure 6, with mold fluxes with Al2O3 content of 7, 20, 30 and 40 pct, respectively. It can be seen from Figure 6 that there are three phase zones in CCT diagram, which are the high-temperature liquid phase and the low-temperature glassy or crystalline phases. Typically, there is a key parameter, the critical cooling rate, which will determine whether the mold flux will transform into the glassy or crystalline phase. For example, the CCT diagram of mold flux R0.8A7 (Figure 6(a)) indicates that the crystal will precipitate in the molten slag when the cooling rate is lower than 0.17 C/s; otherwise, glass will be formed when the cooling rate is higher than 0.17 C/s. Therefore, the 0.17 C/s is the critical cooling rate of mold flux R0.8A7. In addirion, it can also be seen from Figure 6 that the initial crystallization temperature decreases with the increase of cooling rate, which results from the increase of molten slag viscosity with the addition of the cooling rate, which requires a larger driving force to initiate the crystallization during the continuous cooling process of the mold flux.
Reference: Not shown in this demo version.

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