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Fundamental study to develop process for producing ultra clean steel with confocal scanning laser microscope (In-situ observation and analysis of agglomeration and removal of non-metallic inclusions in metal melts)

Research Project

Project/Area Number 07455298
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionTohoku University

Principal Investigator

EMI Toshihiko  Inst.for Advanced Materials Processing, Tohoku University Professor, 素材工学研究所, 教授 (30250822)

Co-Investigator(Kenkyū-buntansha) SHIBATA Hiroyuki  Inst.for Advanced Materials Processing, Tohoku University Research Associate, 素材工学研究所, 助手 (50250824)
SUZUKI Mikio  Inst.for Advanced Materials Processing, Tohoku University Associate Professor, 素材工学研究所, 助教授 (10261471)
SATO Shunichi  Inst.for Advanced Materials Processing, Tohoku University Associate Professor, 素材工学研究所, 助教授 (30162431)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1996: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥5,300,000 (Direct Cost: ¥5,300,000)
Keywordsconfocal scanning laser microscope / non-metallic inclusion / collision / aggromelation / molten steel / engulfment / pushing / capillary effect / attraction force
Research Abstract

The behavior of various non-metallic inclusion particles on molten steel surface was "in-situ" studied by using a confocal scanning laser microscope combined with an infrared image furnace. A long-range strong attraction between alumina and alumina-rich solid inclusion particles, and detailed sequence of the collision, agglomeration and formation of alumina clusters was observed on molten steel surface. This attraction force was found to be over 10^<-16>N,reach over 10mum for alumina particles larger than 3mum, and play an important role to promote collision between the particles to form intermediate aggregates, the same between the intermediate aggregates to form loose alumina cluster, and to densify the loose clusters into compact ones. This force was not influenced by the existence of surfactant sulfur in the steel melt. The origin of this long-range strong attraction was examined to be caused by capillary effect around alumina particles on molten steel surface. Solid CaO-Al_2O^3 and CaO-Al_2O_3-SiO_2 inclusion particles were subjected to quick agglomeration to form clusters which densified and deformed into massive solid inclusion particles much easier. The attraction was also found to be in the range of 10^<-16>-10^<-13>N for different particles and extended to a distance of up to 100mum. However, such capillary attraction was not at all found between liquid CaO-Al_2O_3-SiO_2 inclusion particles. Even when the two liquid particles came in touch, merger took place only after contacting for a while. The merger of liquid CaO-Al_2O_3 particles was even more difficult for small particles of less than 7mum, but easier for particles larger than 24mum. Furthermore, an interaction of non-metallic inclusions with advancing melt/solid interface of steel crystals was investigated. The engulfment and pushing of inclusions by the melt/solid interface were clearly observed, and criteria for the engulfment were determined for different inclusion species.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 近間大志: "共焦点型レーザー顕微鏡の材料工学への応用" 素材工学研究所彙報. 51. 35-40 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hiroshi CHikama: "In-site Real Time Obserration of Planar to Cellular and Cellular to Dendritic Transition of Crystal Growing in Fe-C Alloy Melt" Mat.Trans.JIM. 37. 620-626 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 柴田浩幸: "共焦点走査型レーザー顕微鏡による高温における金属の挙動のその場観察法" 日本金属学会会報. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hiroyuki Shibata: "Kinetics and Morphology of Crystal Growth Interacting with Non-Metallic Inclusions in Iron Alloy Melts" Proc.4th Decennial Int.Conf.on Solidification processing. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Chikama, C-H Yu, H.Shibata and T.Emi: ""Application of Confocal Laser Microscope for Material Technology"" Bulletin of Institute for Advanced Materials Processing, Tohoku University. 51. 35-40 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Chikama, H.Shibata, T.Emi and M.Suzuki: ""In-situ Real Time Observation of Planar to Cellular and Cellular to Dendritic Transition of Crystals Growing in Fe-C Alloy Melts"" Mat.Trans.JIM. 37. 620-626 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Shibata, T.Emi, H.Yin and M.Suzuki: ""Kinetics and Morphology of Crystal Growth Interacting with Non-Metallic Inclusions in Iron Alloy Melts"" Proc.of 4th decennal International Conference on Solidification Processing, UK. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Shibata and T.Emi: ""Laser Scanning Microscope Technique to Directly Observe Phase Transformation of Metals at Elevated Temperatures"" Bulletin of the Japan Institute of Metals. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hiroyuki Shibata: "Kinetics and Morphology of Crystal Growth Interacting with Non-Metallic Inclvsions in Iron Alloy Melts" Proc. of 4th decennal International Conference on Solidification Processing, UK. (印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 近間大志: "共焦点型レーザー顕微鏡の材料光学への応用" 素材工学研究所彙報. 51. 35-40 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Chikama Hiroshi: "In-Situ Real Time Observation of Planar to Cellular and Cellular to Dendritic Transition of Crystals Growing in Fe-C Alloys" Materials Transactiona,JIM. 37(印刷中). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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