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<p>Herein, both the characteristics of inclusions and the effect of Ti–La–Mg content on the formation of inclusions in Ti–La–Mg treated steels were studied. It was found that the first added elements would inhibit the forming of inclusions after the latter elements added in the steel composite treated by Ti–La–Mg in sequence. After the composite treatment, the inclusions showed a multi-layer structure morphology, the inner layer was the oxide inclusions of Ti, La or Mg, and the outermost layer was MnS. The composition of the intermediate layer was affected by the content of Ti, La and Mg. When the content of Ti was 0.008 wt pct, the intermediate layer of inclusions was Mn–Si–O, while when the content of Ti was 0.040 wt pct, the intermediate layer was transformed into TiN. When the content of La was 0.018 wt pct in Ti treated steel, MgO·Al<sub>2</sub>O<sub>3</sub> and MgO could form in the molten steel after Mg added, La existed in the form of La–Ti–O. Whereas when the content of La was 0.046 wt pct, Mg had little effect on the composition of inclusions, there were La–O–S besides La–Ti–O. When the content of La was 0.018 wt pct and the content of Mg was lower than 0.0027 wt pct, the Mg in the molten steel formed only MgO·Al<sub>2</sub>O<sub>3</sub>. Moreover, when the Mg content increased to 0.0063 wt pct, the Mg-containing inclusions were transformed into MgO. The content of Ti, La and Mg would significantly affect the size and number of inclusions in molten steel. When Ti increased from 0.008 to 0.040 wt pct, the mean diameter of inclusions in steel decreased and the number density increased. When the Ti content was 0.040 wt pct, La increased from 0.018 to 0.046 wt pct, the size of inclusions increased significantly and the number decreased. In the molten steel with 0.040 wt pct Ti and 0.018 wt pct La, when Mg increased from 0.0009 to 0.0063 wt pct, the number of inclusions increased gradually, and the mean size decreased first and then increased. When the Mg content was 0.0027 wt pct, the mean size of inclusions was the smallest, which was about 2.7 <i>μ</i>m. On this basis, the formation path and mechanism of inclusions in the process of Ti–La–Mg composite treatment were elaborated.</p>

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The Formation of Composite Inclusions in Ti–La–Mg Treated Steel

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Mingming Song,
  • Yumin Xie,
  • Hangyu Zhu,
  • Guojun Ma,
  • Jianli Li,
  • Zhengliang Xue

摘要

Herein, both the characteristics of inclusions and the effect of Ti–La–Mg content on the formation of inclusions in Ti–La–Mg treated steels were studied. It was found that the first added elements would inhibit the forming of inclusions after the latter elements added in the steel composite treated by Ti–La–Mg in sequence. After the composite treatment, the inclusions showed a multi-layer structure morphology, the inner layer was the oxide inclusions of Ti, La or Mg, and the outermost layer was MnS. The composition of the intermediate layer was affected by the content of Ti, La and Mg. When the content of Ti was 0.008 wt pct, the intermediate layer of inclusions was Mn–Si–O, while when the content of Ti was 0.040 wt pct, the intermediate layer was transformed into TiN. When the content of La was 0.018 wt pct in Ti treated steel, MgO·Al2O3 and MgO could form in the molten steel after Mg added, La existed in the form of La–Ti–O. Whereas when the content of La was 0.046 wt pct, Mg had little effect on the composition of inclusions, there were La–O–S besides La–Ti–O. When the content of La was 0.018 wt pct and the content of Mg was lower than 0.0027 wt pct, the Mg in the molten steel formed only MgO·Al2O3. Moreover, when the Mg content increased to 0.0063 wt pct, the Mg-containing inclusions were transformed into MgO. The content of Ti, La and Mg would significantly affect the size and number of inclusions in molten steel. When Ti increased from 0.008 to 0.040 wt pct, the mean diameter of inclusions in steel decreased and the number density increased. When the Ti content was 0.040 wt pct, La increased from 0.018 to 0.046 wt pct, the size of inclusions increased significantly and the number decreased. In the molten steel with 0.040 wt pct Ti and 0.018 wt pct La, when Mg increased from 0.0009 to 0.0063 wt pct, the number of inclusions increased gradually, and the mean size decreased first and then increased. When the Mg content was 0.0027 wt pct, the mean size of inclusions was the smallest, which was about 2.7 μm. On this basis, the formation path and mechanism of inclusions in the process of Ti–La–Mg composite treatment were elaborated.