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Formation Mechanism of Inclusions in Steel by Ti-Al Deoxidation and Their Physicochemical Properties

Research Project

Project/Area Number13650800
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionThe University of Tokyo

Principal Investigator

MORITA Kazuki  The University of Tokyo, Graduate School of Engineering, Associate Proessor, 大学院・工学系研究科, 助教授 (00210170)

Project Period (FY) 2001 – 2002
Project Status Completed(Fiscal Year 2002)
Budget Amount *help
¥3,200,000 (Direct Cost : ¥3,200,000)
Fiscal Year 2002 : ¥1,200,000 (Direct Cost : ¥1,200,000)
Fiscal Year 2001 : ¥2,000,000 (Direct Cost : ¥2,000,000)
KeywordsThermodynamics / Inclusion in Steel / Deoxidation / Aluminum / Titanium / Phase Equilibrium / Activity / Knudsen Cell / 鋼中介在物
Research Abstract

Thermodynamic properties of the Al_2O_3-SiO_2-TiOx oxide system, which are important for the morphology control of steel using non-metallic inclusions formed during steelmaking processes, have been investigated.
Firstly, phase relations for the Al_2O_3-SiO_2-TiOx system at 1873 K were clarified. Solubilities of Al_2O_3 and TiOx were found to be 28 mass% and 50 mass%, respectively, and the ratio of Ti^<4+>/ Ti^<3+> increased with increase in SiO_2 content of the oxide, which indicated that both Ti^<4+> and Ti^<3+> behaved as network formers also from the results of Raman spectroscopy of the quenched samples.
Secondly, the activity of each constituent was measured. Oxide melts were equilibrated with Fe-C-Si alloys and the activity of SiO_2 was determined from the final Si content and activity coefficient of Si in the alloy. On the other hand, Knudsen cell effusion method was employed for the activity of Al_2O_3 From the vapor pressures of Al, Si, AlO and SiO for the molten oxide equilibrated with Al-Si-Ti alloy, the activities of Al_2O_3 and SiO_2 were determined. The obtained value of SiOs agreed well with that by chemical equilibration technique, and that of TiOx was also derived by Toop's method. These values demonstrated that the affinity of Si0_2 for Al_2O_3 was almost the same as that of TiOx.
The findings drawn in the present research quantitatively provide the driving force necessary in discussing the mechanism of inclusion formation. Also, the composition of steel equilibrated with various compositions of oxide inclusions can be assessed from the results, which leads to an optimization in deoxidation process control.

Report

(3results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report

Research Products

(12results)

All Other

All Publications

  • [Publications] M.Ohta: "Thermodynamics of the Al_2O_3-SiO_2-TiO_x System at 1873 K"ISIJ International. 42. 478-481 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohta: "Phase Relations and Activity Measurements for the Al_2O_3-SiO_2-TiOx System"Proc. 85th Steelmaking Conference. 725-734 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 太田 光彦: "シリコン基合金/Al_2O_3-SiO_2-TiO_x系酸化物平衡下での蒸気圧測定による活量測定"日本質量分析学会第49回質量分析綜合討論会(2001)講演要旨集. 84-85 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 太田 光彦: "Al_2O_3-SiO_2-TiO_x系介在物中Al_2O_3及びSiO_2の活量測定"材料とプロセス. 14. 924 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohta et al.: "Thermodynamics of the Al_2O_3-SiO_2-TiOx System at 1873K"ISIJ International. 42. 474-481 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohta et al.: "Phase Relations and Activity Measurements for the Al_2O_3-SiO_2-TiOx System"Proc. 85th Steelmaking Conference. 725-734 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohta et al.: "Activity Determination of the Al_2O_3-SiO_2-TiOx Oxide Systems in Equilibrium with Si-Based Alloys by the Measurements of Vapor Pressure"Abstract of the 49^<th> Annual Conference on Mass Spectrometry. 84-85 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohta et al.: "Activity Measurements of Al_2O_3 and SiO_2 in the Al_2O_3-SiO_2-TiOx system"Current Advances in Materials and Processes, Report of the ISIJ Meeting. 14. 924 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohta, K.Morita: "Phase Relations and Activity Measurements for the Al_2O_3-SiO_2 TiO_x System"Proc.85th Steelmaking Conference, ISS. 725-734 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Ohta, K.Morita: "Thermodynamics of the Al_2O_3-SiO_2-TiO_x System at 1873K"ISIJ International. Vol. 42, No.5. 474-481 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 太田光彦, 森田一樹: "シリコン基合金/Al_2O_3-SiO_2-TiO_x系酸化物平衡下での蒸気圧測定による活量測定"第49回質量分析統合討論会講演要旨集. 84-85 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 太田光彦, 森田一樹: "Al_2O_3-SiO_2-TiO_x系介在物中Al_2O_3及びSiO_2の活量測定"材料とプロセス. 14. 924 (2001)

    • Related Report
      2001 Annual Research Report

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Published : 2001-04-01   Modified : 2016-04-21  

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