Oxygen Solubility and Oxide Phases in the Fe-Cr-O System

Equilibrium between Dissolved Chromium and Oxygen in Liquid High Chromium Alloyed Steel Saturated with pure Cr2O3.

“…However, the reported critical Cr content has large scattering from 3 to 9 mass% among previous researchers. 1,3,5,6,16,19,20,25,27,31,32) There is also another uncertainty on the formation of Cr 3 O 4 at higher Cr content. [40][41][42] In order to estimate the stable region of pure solid Cr 2 Combination of Eqs.…”

“…Due to such demands, a number of researches have been done in the past on the thermodynamic study in Fe-Cr-O system. Figure 1 reviews most of the available literature values on the relation between Cr and O dissolved in liquid iron in the vicinity of 1 873 K. 1,3,5,6,16,19,20,25,27,31,32) Solid lines in Fig. 1 denote the recommended values by the 19th Committee on Steelmaking, the Japan Society for the Promotion of Science (JSPS), at 1 873 K. 33) It is known that the liquid Fe-Cr alloy is in equilibrium with Cr 2 O 3 or FeO · Cr 2 O 3 depending on the Cr content in the metal.…”

An assessment of thermodynamic parameters for deoxidation of molten iron by Cr, V, Al, Zr and Ti.

“…Kojima22) found Ti305 to be stable below 0.4 wt. % Ti in molten [10][11][12][13][14][15] in the range where Ti305 is stable in contrast to the recommended value of 5.45 x 10-20. Therefore these estimates have not been included in Table 3.…”

“…On the basis of literature review, it was decided to accept the following as stable oxides at 1 600 °C FeCr204 at less than 3 % Cr, Cr203 at 3'-8 % Cr, Cr304 above 8 % Cr. [11][12][13] Calculations were performed with the data of Fruehan14) as well as of Janke and Fischer13> assuming Cr304 as the stable oxide in equilibrium. For all purposes, Models 1 and 2 yielded approximately the same values of parameters and same curves.…”

Thermodynamics of Oxygen in Liquid Fe-Cr Alloy Saturated with FeO Cr2O3 Solid Solution.

“…A huge number of studies [1][2][3][4][5][6][7][8][9][10][11] concerning the Cr and O equilibrium relation have been reported due to such demands, where the Cr content in liquid iron has been up to 50 mass%. Most of researchers [3][4][5][6][7][8]10) have conducted their experiments at high Cr content in metal by using MgO 12) These facts indicate that the activity of Cr 2 O 3 in equilibrium with molten Fe-Cr alloy is lower than unity on their experimental conditions. In direct expression, Cr and O equilibrium in liquid iron has not yet been well established in spite of its industrial importance for stainless steel processing.…”