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1992 Fiscal Year Final Research Report Summary

Development of On-line Monitoring System for Surface Quality of Strips in Strip Casting

Research Project

Project/Area Number 02555140
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 金属加工(含鋳造)
Research Institutionthe University of Tokyo

Principal Investigator

SUZUKI Toshio  the University of Tokyo, Faculty of Engineering, associate professor, 工学部(試), 助教授 (70115111)

Co-Investigator(Kenkyū-buntansha) MIZUKAMI Hideo  the University of Tokyo, Faculty of Engineering, research associate, 工学部(試), 助手 (30229687)
IKEDA Minoru  the University of Tokyo, Faculty of Engineering, research associate, 工学部, 助手 (50167243)
Project Period (FY) 1990 – 1992
KeywordsStainless Steel / Strop Casting / Raped Solidification / Optical Temperature Measurement
Research Abstract

A new system using a photo-diode was developed for measuring the surface temperature of a rapidly solidifing sample. With the system the precise thermal history during the initial stage of solidification of 18Cr-8Ni stainless steel was measured. From the obtained cooling curves. it was shown there existed large undercooling before nucleation. Cellular structure of metastable austenitic phase was formed near the surface of the sample. Effects of atmosphere gas. materials and roughness of chill plates. temperature of chill plate on the solidification behavior and the formed structure were systematically investigated. The obtained results are summarized as follows; 1) the degree of undercooling depends only on cooling rate, 2) Surface structure changes from meta-stable austenitic cell to stable feritic dendrite with the decrease of cooling rate and 3) the transitional cooling rate from meta-stable phase to stable one is about 5000 degree per second. One dimensional solidification analysis shows that there exist large temperature gradient and growth velocity near the surface. which relate the formation of cool structures. Explanation for the cell formation using dendrite growth theory has been also tried, but simple growth model without nucleation mechanism is not enough to describe the phenomena obtained in the experiments.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 水上 英夫,鈴木 俊夫,梅田 高照: "急速凝固SUS304鋼の温度計測法の開発" 東京大学工学部総合試験所年報. 50. 181-186 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水上 英夫,鈴木 俊夫,梅田 高照: "急速凝固18Cr-8Niステンレス鋼の温度計測と初期凝固組織の形成" 鉄と鋼. 77. 1672-1679 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水上 英夫,鈴木 俊夫,梅田 高照: "急速凝固18Cr-8Niステンレス鋼の初期凝固組織に及ぼすチル板表面粗度およびチル板表面材質の影響" 鉄と鋼. 78. 580-586 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水上 英夫,鈴木 俊夫,梅田 高照: "急速凝固18Cr-8Niステンレス鋼の初期凝固過程の解析" 鉄と鋼. 78. 767-773 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水上 英夫,鈴木 俊夫,梅田 高照: "急速凝固18Cr-8Niステンレス鋼における初期凝固組織制御" 鉄と鋼. 78. 1369-1376 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mizukami T.Suzuki T.Umeda: "Development of measurement system for surface temperature of 18Cr-8Ni stainless steel sample under rapid solidification" Annual Report of Engineering Research Institute Faculty of Engineering University of Tokyo. 50. 181-186 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Mizukami T.Suzuki T.Umeda: "Temperature measurement during rapid solidification of 18Cr-8Ni stainless steel and its initial solidification structure" TETSU-TO-HAGNE. 77. 1672-1679 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Mizukami T.Suzuki T.Umeda: "Effect of surface roughness and surface material of substrate on initial solidification structure of 18Cr-8Ni stainless steel" TETSU-TO-HAGANE. 78. 580-586 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Mizukami T.Suzuki T.Umeda: "Numerical analysis for initial stage of solidification of 18Cr-8Ni stainless steel" TETSU-TO-HAGANE. 78. 767-773 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Mizukami T.Suzuki T.Umeda: "Control of initial solidification structure of rapidly solidified 18Cr-8Ni stainless steel" TETSU-TO-HAGANE. 78. 1369-1376 (1992)

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

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Published: 1994-03-24  

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