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۱The influence of TiO2 and Na2CO3 on the viscosity and crystallization behavior of mold powders
نویسنده(ها): ، ،
اطلاعات انتشار: International Journal of iron and steel society of Iran، هشتم،شماره۱(پياپي ۱۴)، ۲۰۱۱، سال
تعداد صفحات: ۷
Mold powders are fluxing agents used as raw materials in the steel industry, which play very important role in processing stability and final surface quality of a product. Surface quality depends particularly on the viscosity and the heat transfer of infiltrated mold flux between the mold wall and the solidified steel shell. Heat flux across the interfacial gap depends on thermal properties of slag layer and its thickness, which is affected by slag properties such as melting, crystallization behavior, and temperature–dependent viscosity. Among all of the components of these powders, fluorine mainly controls the viscosity, solidification temperature and crystallization behavior of mold flux films. However, the volatilization and acidification of the fluoride is a significant health hazard and causes environmental pollution and intensifies the erosion to continuous caster. In this study, TiO2 is used as a substitution to fluorine in commercial start flux. The substitution possibility was examined by measuring the viscosity and crystallization behavior, when it was compared with the properties of industrial powder. In present study, devitrification has been investigated by DTA non–isothermal experiments. It has been shown that titanium dioxide tends to increase crystallization temperature with increasing the formation of perovskite crystalline phase and this causes a decrease in heat flux between the strand and the copper mold. On the other hand, slag viscosity was decreased with increasing titanium dioxide and Na2CO3 content. Further XRD characterizations have provided a similar fraction of crystalline phases through Riaz method in the industrial powder and low fluorine sample with 8wt% TiO2.

۲Correcting the Stress–strain curve in hot compression test using finite element analysis and Taguchi method
نویسنده(ها): ، ،
اطلاعات انتشار: International Journal of iron and steel society of Iran، هشتم،شماره۱(پياپي ۱۴)، ۲۰۱۱، سال
تعداد صفحات: ۸
In the hot compression test friction has a detrimental influence on the flow stress through the process and therefore, correcting the deformation curve for real behavior is very important for both researchers and engineers. In this study, a series of compression tests were simulated using Abaqus software. In this study, it has been employed the Taguchi method to design experiments by the factors of material flow curve and the friction coefficient. The compression test was simulated up to the axial strain of 1 and then the deformation curve was extracted from the force–displacement plot of the strokes. Deviations between the deformation curves and the material flow curves were analyzed using Taguchi approach. Furthermore, the final shape of samples and friction coefficients were logically correlated. As a result, a new method was proposed in order to evaluate the material flow curve, based on the experimental data by the mathematical data manipulation..
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