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1995 Fiscal Year Final Research Report Summary

DEVELOPMENT OF HIGH-SPEED SOLIDIFICATION PROCESS FOR PRODUCTION OF RAPID SOLIDIFICATION MATERIALS

Research Project

Project/Area Number 05239102
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionUNIVERSITY OF TOKYO

Principal Investigator

NISHIO Shigefumi  University of Tokyo, Institute of Industrial Science, Professor, 生産技術研究所, 教授 (00111568)

Co-Investigator(Kenkyū-buntansha) IWAKI Toshihiro  Toyama University, Dept.of Mechanical System Engineering, Professor, 工学部, 教授 (90019191)
SUZUKI Toshio  University of Tokyo, Dept.of Metallurgy Professor, 大学院・工学系研究科, 教授 (70115111)
FUKUSAKO Shoichiro  Hokkaido University, Div.Mechanical Science Professor, 工学部, 教授 (00001785)
Project Period (FY) 1993 – 1995
KeywordsRapid Solidification / Molecular Dynamics / Nucleation / Melt Quenching / Contact Resistance / Contact Line
Research Abstract

In general, solidification process consists of a sequential series of the following elementary phenomena : nucleation, crystal growth, morphological boundary and structure formation. This study aimed at the development of ultra-rapid solidification process which brings about substantial modifications in the sequential series and a variety of attractions compared with conventional solidification of relatively heavy sections.
For the sequential series of elementary phenomena, to predict the ultra-rapid solidification process and contribute to material design, we examined the nucleation condition, modeling of the process from nucleation to structure formation, and application of numerical simulation based on molecular dynamics. Experimental data were accumulated for the effects of melt volume and cooling rate on the supercooling at nucleation. It was also shown experimentally that the quenching and nucleation process becomes uniform by selecting the condition of chill surface. A measuring … More method of nucleation site distribution was developed, and it was found that smaller values of initial superheating of the melt result in more regular distribution of nucleation sites. Based on these results, a model describing the process from nucleation to the structure formation such as dendrites. As for molecular dynamics simulation, it became possible to pursue the formation of thermal stress and dislocations in ultra-rapid solidification.
Rapid solidification is most readily achieved by concurrently imposing high cooling rates and this requires sufficiently good contact of a sufficiently thin section of melt with a metal chill surface to achieve ultra-rapid solidification. In this study, possible mechanisms which obstacle such good contact were investigated and the following results were obtained. The stability of contact line relates closely to the formation of geometrical surface defects resulting in contact resistance. The contact line formed on a moving chill surface is unstable at low and high velocities but it is stable at moderate velocities. The destabilizing velocity, which is the upper critical velocity of the stable contact line, results from the dynamic non-wetting condition of the contact line. The stabilizing velocity, which is the lower critical velocity of the stable contact line, decreases with decreasing thermal conductivity of the chill surface. To stabilize the contact line and suppress the formation of contact resistance, it is effective to locate the solidification front below the contact line. Less

  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Nishio,S.: "Observation of Shell Formation Proces during Initial Solidification on a Suoercooled Solid Surface Dipped into Melt Pool" Proc.7th Int.Symp.on Transport Phenomena in Manufacturing Processes. 236-241 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nishio,S.: "Relatively Microscopic Observation of Stability of Contact Line Accompanied with Solidification" Proc.ICHMT Symp.on Molecular and Micro Heat Transfer in Materials Processing and Other Applications. 2. 208-319 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Fukusak,T.: "Solidification Characteristics of Supercooled High-Temperature Melt" Proc.4tw ASME/JSME Thermal Engng Conf.4. 55-60 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamada,M.: "Solidification and Super coooling Characteristics of a Droplet on a Horizontal Cooled Woll" Proc.3rd KSME-JSME Thermal Engng.Joint Conf.1. 221-226 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamada,M.: "Solidification and Supercooling Characteristics of Micro-Scale Droplet" Proc.ICHMT Symp.on Molecular and Micro Heat Transfer in Materials Processing and other Applications. 2. 214-222 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Suzuki,T.: "Dendrite Growth from the Undercooled Melts of Alloys" Proc.ISIJ International. 35. 178-182 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sakuma,U.: "Rapid solidification Analysis of 18Cr-8Ni Stainless steel Considering Dendrite Growth Conditions" Proc.Tetsu-to-Hagane. 81. 518-522 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Suzuki,T.: "Spatial Pattern Analysis of Primary Dendrite Arrays Using Minimal Spanning Tree" Proc.J.Japan.Inst.Metals.64. 449-455 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Suzuki,T.: "Spatial Pattefn Analysis for Surface Nucleation Point Distribution of Rapidly Solidified Alloys" Proc.ICHMT Symp.on Molecular and Micro Heat Transfer in Materials Processing and other Applications. 2. 223-229 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Iwaki,T.: "Molecular Dynamics Study on Propagation of Pressure Wave and Its Control" Proc.Thermal Science and Engineering. 3. 1-6 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Iwaki,T.: "Molecular Dynamics Study on Stress-Strain in Very Thin Film(Size and Location of Region for Defining Stress and Strain)" Proc.JSME International Journal(seriesA). 39. 346-353 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Iwaki,T.: "Molecular Dynamics Study on Thermal Stress During Very Rapid Solidification" Proc.ICHMT Symp.on Molecular and Micro Heat Transfer in Materials Processing and other Applications. 1. 165-176 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Nishio, S.Inamura and N.Nagai: "Observation of Shell Formation Process during Initial Solidification on a Supercooled Solid Surface Dipped into Melt Pool" Proc.7^<th> Int.Symp.on Transport Phenomena in Manufacturing Processes. 236-241 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Nishio: "Rlatively Microscopic Observation of Stability of Contact Line Accompanied with Solidification" Proc.ICHMT Symp.on Molecular and Micro Heat Transfer in Materials Processing and Other Applications. Vol.2. 308-319 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Fukusako, M.Yamada, and A.Horibe: "Solidification Characteristics of Supercooled High-Temperature Melt" Proc.4^<th> ASME/JSME Thermal.Engng.Conf.Vol.4. 55-60 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamada and S.Fukusako: "Solidification and Supercooling Characteristics of a Droplet on a Horizontal Cooled Wall" Proc.3^<rd> KSME-JSME Thermal Engng.Joint Conf.Vol.1. 221-226

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamada and S.Fukusako: "Solidification and Supercooling Characteristics of Micro-Scale Droplet" Proc.ICHMTS Symp.on Molecular and Micro Heat Transfer in Materials Processing and Other Applications. Vol.2. 214-222 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Suzuki and K.Sakuma: "Dendrite Growth from the Undercooled Melts of Alloys" Proc.ISIJ International. Vol.35. 178-182 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] U.Sakuma and T.Suzuki: "Rapid solidification Analysis of 18Cr-8Ni Stainless steel Considering Dendrite Growth Conditions" Proc.Tetsu-to-Hagane. Vol.81. 518-522 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] V.Suzuki and T.Sato: "Spatial Pattern Analysis of Primary Dendrite Arrays Using Minimal Spanning Tree" Proc.J.Japan Inst.Metals. Vol.61. 449-455 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Suzuki: "Spatial Pattern Analysis for Surface Nucleation Point Distribution of Rapidly Solidified Alloys" Proc.ICHMT Symp.on Molecular and Micro Heat Transfer in Materials Processing and Other Applications. Vol.2. 223-229 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Iwaki: "Molecular Dynamics Study on Propagation of Pressure Wave and Its Control" Proc.Thermal Science and Engineering. Vol.3. 1-6 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Iwaki: "Molecular Dynamics Study on Stress-Strain in Very Thin Film (Size and Location of Region for Defining Stress and Strain)" Proc.JSME International Journal (series A). Vol.39. 346-353 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Iwaki: "Molecular Dynamics Study on Thermal Stress During Very Rapid Solidification" Proc.ICHMT Symp.on Molecular and Micro Heat Transfer in Materials Processing and Other Applications. Vol.1. 165-176 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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