Abstract
AbstractThe oxidizability characterization method of slag system has a decisive influence on the accuracy of the desulfurization model. By carrying out the balance experiments of melting system composed of CaF2–CaO–Al2O3–SiO2–TiO2–MgO–FeO slag system and Inconel 718 superalloy, the influence of Al2O3 and FeO on desulfurization distribution ratio at 1,773 K was studied. Based on the ion and molecule coexistence theory in slag, the effects of three oxidizability characterization methods, [Fe]–[O] balance, [Al]–[O] balance, and [Fe]–[Al]–[O] balance, on the accuracy of desulfurization thermodynamic model were studied. The results show that the effect of FeO on desulfurization distribution ratio is more significant than that of Al2O3 when the FeO content in slag is greater than 0.014%. When the FeO content in the slag is less than 0.014%, the effect of Al2O3 on the slag oxidizability will be greater than that of FeO. The calculated value of [Fe]–[Al]–[O] balance model is closer to the experimental-measured value compared to [Fe]–[O] balance model and [Al]–[O] balance model alone at 1,923 K.
Highlights
Inconel 718 alloy is widely used in aerospace and other fields due to its excellent properties of high temperature resistance, The oxidizability of slag has a complex effect on the sulfur content ratio [8]
Geng et al [10] proposed that unstable oxides (FeO, Cr2O3, MnO, SiO2, etc.) in slag would increase the oxidizability of slag, affecting the dissolved oxygen content in superalloy, and further affecting the desulfurization reaction
The oxygen content calculated by the model is lower than the results of industrial tests, which leads to the inaccuracy of the desulfurization thermodynamic calculation model
Summary
Inconel 718 alloy is widely used in aerospace and other fields due to its excellent properties of high temperature resistance,. Li et al [9] studied the influence of slag system on sulfur in the electroslag remelting process and concluded that reducing the oxidized elements in the slag can enhance the desulfurization rate. The required FeO content in the slag in the electroslag remelting process is very low and usually less than 0.5% At this time, the effect of Al2O3 on the slag oxidizabilty should not be ignored. The desulfurization thermodynamic model of Inconel 718 superalloy electroslag remelting process was studied through a slag–metal balance experiment. From the thermodynamic point of view, the influence law of slag oxidizability on desulfurization is clarified, which could provide a theoretical basis for precise control of sulfur content in superalloy electroslag remelting process. The effect of three slag oxidizability characterization methods on the desulfurization thermodynamic model was evaluated through experiments
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