Effects of Pre-Dispersed and Surface-Modified AlTi-MgO Nanoparticles on Inclusion Characteristics in Carbon Structural Steel




Abstract: In the study, an innovative approach involving pre-dispersing MgO nanoparticles with AlTi alloy nanoparticles and chemical modification of the surfaces of AlTi-MgO nanoparticles (NPs) for steelmaking was investigated. Different mass fractions of AlTi-MgO NPs and surface treated AlTi- MgO NPs addition were selected as variables. And the differences on the utilization ratio of NPs (URN) and inclusion characteristics between the original steel and test steels were compared. The results revealed the steel with surface-treated NPs addition had a higher URN that facilitated to get finer inclusions. The mean inclusion size reached 0.667 μm when the surface treated NP content was 0.03%, and the size reduced by 27.7% compared the original steel. The inclusions in the test steels were converted to MgAl2O4 spinel or TiN complex inclusions. The FactSage thermodynamic software was used to calculate the precipitation phase containing NPs addition, which was in agreement with the experimental results

Authors: Hao Guo, Shufeng Yang, Jingshe Li, Jikang Li, Tiantian Wang, and Hongbo Zheng

Keywords: MgO nanoparticles, Surface treatment, Inclusions, Thermodynamic calculation

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7 pages


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