N.A. Gokcen, Author’s reply

Thermodynamic reevaluation of the Fe–O system

“…Sundman [5] assessed the data [83][84][85][86] on the activity of oxygen in liquid iron up to X 0.015 O = . Additional experimental data of Floridis and Chipman [87], Goksen [88], Sakao and Sano [89] and Fischer et al [90] were considered in the present study. The experimental results are expressed as isotherms log 10 P(O 2 ) vs X O and shown in Fig.…”

“…15 and 16. The lines calculated from the model parameters optimized in the present study are shown along with the selected experimental data [83][84][85][86][87][88][89][90]. The scatter of the experimental points is clearly visible in Figs.…”

“…Oxygen potential in Fe-O liquid expressed as isotherms: experimental points and calculated lines[11,[83][84][85][86][87][88].…”

Thermodynamics of Nitrogen in Fe-Mn-Al-Si-C Alloy Melts

“…As shown in Figure 3, the N solubility calculated from their model parameters agrees well with the lower N solubility dataset. [57][58][59][60][61] On the other hand, the higher N solubility dataset such as recent experimental data measured by Kim et al [34] at low temperature and Tsu and Saito [41] at higher temperature region were more favored in the present optimization. As pointed out by Kim et al [34] and Tsu and Saito, [41] the relatively high vapor pressure of Mn can affect the N 2 partial pressure over the melt surface and the absorption of N by Mn vapor cannot be neglected in this system: The Mn vapor pressure is calculated to be 0.05 and 0.2 atm at 1873 K and 2073 K (1600°C and 1800°C), respectively.…”

“…In the course of the thermodynamic modeling of the ternary Fe-Al-N solution, it was found that zero Dg AlN parameter is more suitable to predict the nitrogen solubility in Fe-Al melt (see in Section III-C-2). Therefore, considering that the [34,41,[57][58][59][60][61][62] along with the present optimization and previous modeling results. [56] [%N] [ 34,41,57,[59][60][61]63] experimental results by Iwase [64] and Schweighofer and Ku´dela [65,66] in Figure 5 were obtained in metastable condition, it was decided to keep the Dg AlN ¼ 0 for more accurate predictions in higher order system.…”