Abstract
Oxygen is an important element for improving the sulfide morphology in steels that require machinability. Therefore, 50 ppm oxygen was added to 1215MS free-cutting steel under industrial conditions; the effect of oxygen on sulfide morphology and the formation mechanism of three types of sulfides were explored. The precipitation temperature of sulfide in steel at equilibrium state is 1489.98°C; oxygen can dissolve in MnS to form spherical single-particle Mn(S,O). Annular polycrystalline Mn(S,O) with a diameter of 10 μm was observed by characterization of scanning electron microscopy and electron backscatter diffraction (SEM and EBSD). It is formed by three stages of contact, sintering and densification. Sintering force is a vital force in the formation of polycrystalline Mn(S,O). Mn(S,O)-MOx(M = Si,Al,Mn,Fe) composite inclusion is formed by a liquid inclusion, (Mn,Si,Al,Fe)x(O,S)y; the precipitation order of different phases is FeO, Mn(S,O), (Si,Mn,Al)xOy and (Si,Al,Mn)xOy. (Si,Mn,Al)xOy is Mn2SiO4 with dissolved Al, while (Si,Al,Mn)xOy is Mn3Al2Si3O12 when the atomic content of Al2O3 in liquid inclusion is > 0.063.
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Acknowledgements
The authors express their appreciation to National Natural Science Foundation of China (Grant No. 52074179) for supporting this work. One of the authors, Xiangyu Xu, gratefully acknowledges support from the National Natural Science Foundation of China (Youth Program no. 52104335) and Shanghai “Super Postdoctoral” Incentive Plan (Grant No. 2020194).
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Tian, Q., Shen, W., Zhang, X. et al. Formation, Aggregation, and Composite with Oxide Mechanisms of Oxysulfide in 1215MS Free-Cutting Steel. JOM 75, 5764–5772 (2023). https://doi.org/10.1007/s11837-023-06141-6
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DOI: https://doi.org/10.1007/s11837-023-06141-6