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| Thermodynamics and dynamics of MnS inclusions precipitation during solidification process in heavy rail steels |
| ZHANG Xue-wei1，ZHANG Li-feng1，YANG Wen1，DONG Yuan-chi2，LI Yang-zhou3 |
（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China
2. School of Metallurgical Engineering， Anhui University of Technology， Ma’anshan 243002， Anhui， China
3. Vanadium Recovery and Steelmaking Plant， Panzhihua Iron and Steel Co.， Ltd.， Panzhihua 617000， Sichuan， China） |
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Abstract The three-dimensional morphologies of MnS inclusions in continuous casting blooms and rolled rails of U75V steel were obtained by electrolytic extraction method using non-aqueous electrolytes combined with SEM method. However， MnS was elongated along the rolling direction during rolling process， and the morphology of MnS inclusions presents an elongated shape in rail. Precipitation of MnS inclusions was studied on the basis of thermodynamics and kinetics model in heavy rail steels， and the amount of segregation behavior of[w([Mn])]and[w([S])]elements in molten steel was quantified during solidification. The calculated results show that MnS inclusions were generated due to the initial concentration product of manganese and sulfur equaled to the equilibrium concentration product， i.e.， MnS inclusions started to precipitate in the solid which fraction was 0.94. In comparison， the thermodynamic calculation results were in good agreement with that of the results by Thermo-Calc and FactSage6.4. Effect of the initial concentration of Mn and S in molten steel and cooling rate during solidification on the amount of MnS inclusions was calculated using micro-segregation model. In addition， the size of MnS inclusions decreased obviously with increasing cooling rate through the dynamic calculation. Therefore， the influences of the content of[w([Mn])]and[w([S])]in molten steel and the cooling rate on the characteristics of MnS inclusions in heavy rail steel were analyzed， including precipitation size， time and amount of the MnS particles. Thus， it would be helpful for decreasing detrimental factors on the properties of steel.
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Received: 04 March 2016
Published: 29 August 2016
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2016, Vol. 51 
