Abstract
The formation mechanism of AlN-MnS complex inclusions in Fe-5Mn-2Al-0.15C medium Mn steel was investigated under as-cast conditions by microstructure observation, thermodynamic analyses, and the Clyne–Kurz microsegregation model. The results showed the variations in the maximum and minimum partition coefficients for N and S were relatively large, and that the maximum diffusion coefficients of solute N, S, Mn and Al were more than 70% more than the minimum ones. Therefore, the variable partition coefficients and variable diffusion coefficients of solute elements under different temperatures should be considered in the Clyne–Kurz model during the solidification process. The partition coefficients of Al were higher than 1, segregating into the dendrite interior. However, the partition coefficients for elements N, Mn, and S were lower than 1, enriching in the residual liquid steel. By the Clyne–Kurz model considering the variable partition coefficients and variable diffusion coefficients, the precipitation temperatures of AlN and MnS were 1738 K and 1717 K during the solidification process, respectively. With experimental observation, the formation of AlN-MnS complex inclusions during the solidification process may be the AlN acting as a nucleation site for MnS, and then MnS wrapped or attached to the surface of AlN.
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This work was supported by the National Natural Science Foundation of China (Nos. 51974079, 52174310). The authors greatly appreciate their support.
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Jin, Lb., Zheng, Sg. & Zhu, My. Formation Mechanism of AlN-MnS Complex Inclusions in Fe-5Mn-2Al-0.15C Medium Mn Steel. JOM 75, 2235–2245 (2023). https://doi.org/10.1007/s11837-023-05831-5
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DOI: https://doi.org/10.1007/s11837-023-05831-5