The equilibrium titanium oxide phase was identified as Ti 3 O 5 (s) for iron melts containing 0.0012-0.25 mass% Ti at 1 873 K. The equilibrium constant of Ti deoxidation reaction for the formation of pure Ti 3 O 5 (s) were estimated as follows. The activity coefficient of Ti in liquid iron at infinite dilution, g°T i(s) was assessed as 0.011, 0.014 and 0.018 at 1 823 K, 1 873 K and 1 923 K, respectively.
The AlN solubility product in liquid iron containing manganese up to 22 mass% were measured by the metal-nitride-gas equilibration technique in the temperature range from 1 823 to 1 873 K. Manganese significantly increased the AlN solubility product in liquid iron primarily due to the large effect of manganese on the nitrogen solubility. Using the Wagner's formalism, the experimental results were thermodynamically analyzed to determine the thermodynamic interaction parameters between manganese and aluminum in high Mn-Al alloyed liquid steels as follows;(Mn ≤ 22 mass%, Al ≤ 1.8 mass%, 1 823-1 873 K) KEY WORDS: high manganese steel; AlN; aluminum; nitrogen; interaction parameter.
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