Statistico-Thermodynamical Studies on the Fundamental Reactions concerning Steel-Making. II : The Equilibrium Relationship between Oxygen and Carbon in Liquid Iron under Various Pressures of CO Gas
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概要
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It has been considered that the concentration of oxygen dissolved in a molten iron is decreased by the addition of carbon under the following relation : [O] ・[C] = Constant . This formula has been deduced by regarding the liquid state of iron dissolving oxygen and carbon as an ideal solution. But from the many experimental evidences such a liquid state of iron cannot be considered as an ideal solution. This deviation from the ideal behaviour shows that the mutual interactions between these solute atoms cannot be neglected in discussions of the equilibrium relation between the liquid iron and the gas mixture CO-CO_2. If we compute the equilibrium relation between [O] and [C] in connection with the partial pressure of gas phaes in contact with the liquid iron under the above circumstances, it can be written in the following formula : xy= P_<CO>/K_1・K_2{1-2(x+y)}^2exp[-2/1-(x+y){x ψOC/kT+y(ψOC/kT+ψCC/kT)}], where x and y are atomic fractions of [O] and [C], respectively, and K_1 and K_2 are the so-called equilibrium constants for [O] and [C], respectively. If ψ/kT= O, the above equation is reduced to the formula [O] ・[C] = const. But it was determined experimentally that the probable values of ψCC/kT and ψOC/kT are 2.68 and -10.7, respectively, at 1540℃. Consequently, the product [O] ・ [C] increases with the increase of [C] concentration and the inclination of curve [O] ・ [C] vs. [C] becomes larger as the pressure P_<CO> becomes higher. These results are in good agreement with Chipman's observations. And it is also shown that [O] decreases rapidly with the increase of [C] in a region of low carbon content and attains a minimum value at a certain concentration of [C], but on the contrary, it rather increases with the addition of carbon in the range of higher carbon content. Thus the deoxidation by carbon in the molten state of iron is available only in the region of small concentration of carbon.
- 東北大学の論文
著者
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Takeuchi Sakae
The Research Institute For Iron Steel And Other Metals
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Takeuchi Sakae
The Research Institute For Iron. Steel And Other Metals
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