Scholarlink

<p>Ti/Al ratio plays a critical role in determining the formation, evolution and agglomeration behavior of non-metallic inclusions in low-carbon low-alloyed steel production. In this study, the agglomeration behavior of inclusions with varying Ti/Al ratios were systematically investigated by combining <i>in-situ</i> observation experiments and electron microscopies. The obtained results indicate that when Ti/Al &lt; 1 (Ti = 5 ppm and Al = 150 ppm in sample S2, Ti = 5 ppm and Al = 420 ppm in sample S3), spherical Al<sub>2</sub>O<sub>3</sub> inclusions could be predominantly observed, with no significant morphological changes. As the Ti/Al ratio increased to 1 (Ti = 5 ppm and Al = 6 ppm in sample S1, Ti = 460 ppm and Al = 420 ppm in sample S6), Al<sub>2</sub>O<sub>3</sub> remains to be the thermodynamically stable oxide inclusion. However, a morphological transition of Al<sub>2</sub>O<sub>3</sub> inclusions from spherical to irregular shapes was observed in Sample S6, suggesting that high Ti content can significantly influence the morphology of the stable oxide inclusions. When the Ti/Al ratio was increased to 2.8 (Ti = 420 ppm and Al = 150 ppm in sample S5), Al<sub>2</sub>TiO<sub>5</sub> replaced Al<sub>2</sub>O<sub>3</sub> as the stable oxide phase under the steel composition. Further increasing the Ti/Al ratio to a very large number (Ti = 460 ppm and Al = 1 ppm in sample S4), led to the formation of Ti<sub>3</sub>O<sub>5</sub> as the stable oxide inclusion. <i>In-situ</i> observation experiments further revealed the distinct differences in the agglomeration behavior of Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>TiO<sub>5</sub>, and Ti<sub>3</sub>O<sub>5</sub> inclusions. Ti<sub>3</sub>O<sub>5</sub> inclusions exhibit a weak agglomeration tendency since the inclusions were moved following the motion of liquid steel. In contrast, Al<sub>2</sub>O<sub>3</sub> inclusions demonstrate a long-range interaction, leading to the formation of loose clusters. Al<sub>2</sub>TiO<sub>5</sub> inclusions showed a shorter interaction distance than Al<sub>2</sub>O<sub>3</sub>, with the attractive force ranging from 10<sup>−16</sup> to 10<sup>−14</sup> N. The attractive forces between inclusion pairs of Al<sub>2</sub>O<sub>3</sub> and those of Al<sub>2</sub>TiO<sub>5</sub> inclusions were found to be strongly dependent on the interaction distance and the radius of the guest inclusions with a smaller size.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Characterization of Composition Evolution and Dynamic Motion Behavior of Non-metallic Inclusions in Low-Carbon Steels with Various Ti/Al Contents

  • 期刊论文

  • 发表日期：

    2026年3月23日

查看全文
  • Yongbo Yuan,
  • Chen Tian,
  • Wu Deng,
  • Xiaoming Liu,
  • Tie Liu,
  • Qiang Wang,
  • Wangzhong Mu

摘要

Ti/Al ratio plays a critical role in determining the formation, evolution and agglomeration behavior of non-metallic inclusions in low-carbon low-alloyed steel production. In this study, the agglomeration behavior of inclusions with varying Ti/Al ratios were systematically investigated by combining in-situ observation experiments and electron microscopies. The obtained results indicate that when Ti/Al < 1 (Ti = 5 ppm and Al = 150 ppm in sample S2, Ti = 5 ppm and Al = 420 ppm in sample S3), spherical Al2O3 inclusions could be predominantly observed, with no significant morphological changes. As the Ti/Al ratio increased to 1 (Ti = 5 ppm and Al = 6 ppm in sample S1, Ti = 460 ppm and Al = 420 ppm in sample S6), Al2O3 remains to be the thermodynamically stable oxide inclusion. However, a morphological transition of Al2O3 inclusions from spherical to irregular shapes was observed in Sample S6, suggesting that high Ti content can significantly influence the morphology of the stable oxide inclusions. When the Ti/Al ratio was increased to 2.8 (Ti = 420 ppm and Al = 150 ppm in sample S5), Al2TiO5 replaced Al2O3 as the stable oxide phase under the steel composition. Further increasing the Ti/Al ratio to a very large number (Ti = 460 ppm and Al = 1 ppm in sample S4), led to the formation of Ti3O5 as the stable oxide inclusion. In-situ observation experiments further revealed the distinct differences in the agglomeration behavior of Al2O3, Al2TiO5, and Ti3O5 inclusions. Ti3O5 inclusions exhibit a weak agglomeration tendency since the inclusions were moved following the motion of liquid steel. In contrast, Al2O3 inclusions demonstrate a long-range interaction, leading to the formation of loose clusters. Al2TiO5 inclusions showed a shorter interaction distance than Al2O3, with the attractive force ranging from 10−16 to 10−14 N. The attractive forces between inclusion pairs of Al2O3 and those of Al2TiO5 inclusions were found to be strongly dependent on the interaction distance and the radius of the guest inclusions with a smaller size.