Abstract
Abstract In the smelting process of high manganese steel, the volatilization of manganese will be accompanied. In this article, the volatilization of manganese in high manganese steel was studied by simultaneous thermal analyzer. The results show that the volatilization rate of manganese in high manganese steel increases with increasing temperature and holding time. It is proved by experimental study and data analysis that manganese volatilization follows the first-order kinetics model, and the empirical formula of manganese evaporation is derived. The volatile products of manganese were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that the volatile components of manganese mainly consisted of MnO, Mn3O4, Mn2O3, and MnO2. Combined with thermodynamics, the mechanism of manganese volatilization is further analyzed, and two forms of manganese volatilization in high manganese steel are revealed. One is that manganese atoms on the surface of high manganese steel and oxygen atoms in the gas form different types of manganese oxides and then volatilize at high temperature. The other way is that Mn atoms vaporize into Mn vapor and evaporate in high temperature environment, and then are oxidized into different types of manganese oxides. The results of theoretical calculation and experiment show that manganese volatilization is mainly in the first form.
Highlights
With the development of automotive steels toward lightweight, high strength, and high plasticity, high manganese steels have attracted wide attention
Twinning-induced plasticity (TWIP) steel is characterized by a high content of manganese, and a large amount of manganese will be added in smelting process
The liquidus temperature of steel was calculated by ThermoCalc thermodynamic software to be 1,407°C
Summary
With the development of automotive steels toward lightweight, high strength, and high plasticity, high manganese steels have attracted wide attention. TWIP steel is characterized by a high content of manganese, and a large amount of manganese will be added in smelting process. There will be a lot of Mn volatilization in smelting process resulting in heavy Mn loss, which makes the smelting cost of high manganese steel increase greatly [12–14]. The volatile loss of Mn in smelting process will cause the instability of liquid steel composition, which will increase the difficulty of smelting manganese steel. In the smelting process of high manganese steel, Mn volatilization directly affects the yield and composition control of Mn, which plays a key role in cost control and quality of manganese steel. By deepening the understanding of manganese volatilization behavior in Fe–Mn–C–Al TWIP steel, it can provide theoretical guidance for the actual production of smelting TWIP steel and further save cost and improve the quality of steel
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call