Abstract
The article is devoted to the steel modification process with natural materials containing barium and strontium. Using the methods of thermodynamic simulation, the authors considered the reduction process of barium and strontium with silicon and aluminum. The influence of steel treatment with barium-strontium modifiers on the structure formation and mechanical properties of steel has been studied. The research results have been implemented when smelting of steel of 25G2S and G13 grades in electric arc furnace at casting shop of OJSC “EVRAZ ZSMK”, as well as at OJSC “Yurginskii MachineEngineering Plant” when smelting of steel of 35CrGSL, 30CrGSLFL, 12ND2FCr grades using the two-slag technology. The results analysis of the production experiments has shown that a barium-strontium modifier influences the microstructure and non-metallic inclusions, as well as provides the supply increase of structural strength of steel estimated by the values of yield point, strength and impact strength at the positive and negative temperatures. To reveal the presence of barium and strontium in steel the analysis of steel structure has been done, when using the extraction replica method with the usage of transmission electron diffraction microscopy. The presence of barium and strontium in the grain capacity indicates the interaction of these elements with metallic melt having a certain influence on the structure formation of a metallic matrix.
Highlights
The article is devoted to the steel modification process with natural materials containing barium and strontium
The results analysis of the production experiments has shown that a barium-strontium modifier influences the microstructure and non-metallic inclusions, as well as provides the supply increase of structural strength of steel estimated by the values of yield point, strength and impact strength at the positive and negative temperatures
The presence of barium and strontium in the grain capacity indicates the interaction of these elements with metallic melt having a certain influence on the structure formation of a metallic matrix
Summary
Дмитриенко В.И.1, к.т.н., доцент кафедры металлургии черных металлов Платонов М.А.2, к.т.н., старший преподаватель кафедры металлургии черных металлов. С применением методов термодинамического моделирования рассмотрен процесс восстановления бария и стронция кремнием и алюминием. Анализ результатов теоретических расчетов показал, что углерод при температурах 1873 – 1923 К практически не восстанавливает барий и стронций из их оксидов; кремний может восстанавливать барий примерно на 60 %, но плохо восстанавливает стронций (всего лишь на 15 %), а при использовании алюминия степень восстановления бария и стронция из оксидов достигает соответственно 70 и 50 %; температура в интервале 1873 – 2073 К оказывает незначительное влияние на степень восстановления этих элементов Из анализа результатов термодинамического моделирования, представленных авторами [13, 14], следует, что восстановление бария и стронция из их оксидов более полно происходит при использовании в качестве восстановителя алюминия. Для стали марки Г13 испытания на ударную вязкость проводили при температуре +20 и –60 °С.
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