凝固過程における溶鋼中からAl2O3 上への MnS の晶出挙動

Akito Takeda, Takuma Kurokawa, Kengo Kato, Hideki Ono*

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

抄録

Forming conditions and compositional changes of primary inclusions in molten steel have been studied due to the demand for high cleanliness of steels. MnS, a common inclusion in steel, does not form in molten steel, although it is observed in steel with oxide inclusions such as MnO, Al2O3 and SiO2. On the other hand, Mn and S are enriched in molten steel due to the segregation phenomenon during the solidification process which suggests that MnS form in molten steel during solidification. However, the precipitation behavior of MnS inclusions in molten steel due to the enrichment of Mn and S and the interaction between the primary inclusion and the molten steel is still unclear. In this work, a new experimental technique was developed and the precipitation behavior of MnS from molten steel onto solid Al2O3 was studied. Solid MnS precipitates were observed on the Al2O3 rod immersed in the sample with adding Al whereas precipitates containing MnO, A2O3 and MnS were observed on the Al2O3 rod in the sample without adding Al. Thermodynamic analysis revealed that Mn enriched in molten steel is oxidized to form MnAl2O4 when Al content is low and the MnAl2O4 reacts with S in molten iron to form molten MnO–Al2O3–MnS. MnS can precipitate from the molten MnO–Al2O3–MnS. On the other hand, Mn enriched in molten steel does not react with Al2O3 when Al content is high. Therefore, MnS can precipitate at the final period of solidification where Mn and S are significantly enriched in molten steel.

寄稿の翻訳タイトルPrecipitation Behavior of MnS from Molten Iron to Al2O3 during Solidification
本文言語日本
ページ(範囲)112-121
ページ数10
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
111
3
DOI
出版ステータス出版済み - 2025/02/15

キーワード

  • MnS inclusion
  • precipitation behavior
  • solidification
  • thermodynamics

ASJC Scopus 主題領域

  • 凝縮系物理学
  • 物理化学および理論化学
  • 金属および合金
  • 材料化学

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