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Effect of ferromanganese additions on non-metallic inclusion characteristics in TRIP steel

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Abstract

The inclusion characteristics in extra low-carbon ferromanganese (ELC-FeMn), low-carbon ferromanganese (LC-FeMn), mid-carbon ferromanganese (MC-FeMn), and high-carbon ferromanganese (HC-FeMn) were evaluated by scanning electron microscopy coupled with energy dispersive spectroscopy. The effect of FeMn alloys on the cleanliness of transformation-induced plasticity (TRIP) steel was studied based on laboratory-scale experiments and thermodynamic calculations. The results show that the main inclusions in ELC-FeMn are MnO–MnS and MnS, and the dominant inclusions in LC-FeMn and MC-FeMn are MnO, MnO–SiO2, and MnO–SiO2–MnS. The inclusions in HC-FeMn are diversified. Besides MnO–SiO2 inclusion, a certain number of Al-, Si-, and Ti-containing inclusions and enrichment phases of Pb, Sn, and P are observed in HC-FeMn. Before FeMn alloy addition, the main inclusion in steel is Al2O3. After alloying with the four different grades of FeMn alloy, the main inclusions in TRIP steel are Al2O3, AlN, MnS, Al2O3–AlN, AlN–MnS, and Al2O3–MnS. The MnO and SiO2 inclusions from FeMn alloys are not detected in TRIP steel.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 52074199 and U20A20270).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Wei-sheng Wang, Hang-yu Zhu & Ming-ming Song

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Jian-li Li & Zheng-liang Xue

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  1. Wei-sheng Wang
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  2. Hang-yu Zhu
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  3. Ming-ming Song
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  4. Jian-li Li
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Correspondence to Hang-yu Zhu or Jian-li Li.

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Wang, Ws., Zhu, Hy., Song, Mm. et al. Effect of ferromanganese additions on non-metallic inclusion characteristics in TRIP steel. J. Iron Steel Res. Int. 29, 1464–1473 (2022). https://doi.org/10.1007/s42243-022-00768-6

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