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Laboratory Study on Evolution Mechanism of Nonmetallic Inclusions in Al-deoxidized Spring Steel

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Abstract

To explore the effect of refractory on the evolution of inclusions, laboratory experiments were conducted with MgO refractory utilizing electron probe X-ray microanalysis. Based on primary inclusions components, six types of inclusions were observed in the steel with MgO refractory: Al2O3, Al2O3–MgO, Al2O3–CaO, Al2O3–MgO–CaO, Al2O3–SiO2–CaO, and MgO inclusions. Al2O3 and Al2O3–MgO inclusions were the primary inclusions and mainly attributed to deoxidization products, with liquidus temperature exceeding 1600 °C. Al2O3–MgO–CaO inclusions resulted from coalescence between MgO and Al2O3–CaO inclusions as well as reduction of Al2O3–CaO by dissolved Mg. Dual-phase Al2O3–MgO–CaO inclusions were characterized by pure MgO cores surrounded by liquidus Al2O3–CaO layer, which was related to the substitution of dissolved Ca and Al in molten steel for MgO in inclusions.

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(adapted from [29])

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(adapted from [28]): a T0; b M1; c M2; d M3; e M4

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410012, China

    Shangwen Wu & Guangliang Wu

  2. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China

    Yanjing Wang & Sha Lyu

  3. Hebei Agricultural University, Baoding, 071066, China

    Xu Guo

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  1. Shangwen Wu
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  2. Xu Guo
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  3. Yanjing Wang
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  4. Guangliang Wu
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  5. Sha Lyu
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Correspondence to Sha Lyu.

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Wu, S., Guo, X., Wang, Y. et al. Laboratory Study on Evolution Mechanism of Nonmetallic Inclusions in Al-deoxidized Spring Steel. Trans Indian Inst Met 73, 2807–2816 (2020). https://doi.org/10.1007/s12666-020-02067-8

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