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TRANSFORMATION OF STEEL AND SEGREGATION OF IMPURITY ELEMENTS INDUCED BY RAPID HEATING

Research Project

Project/Area Number 05452294
Research Category

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

Allocation TypeSingle-year Grants
Research Field Material processing/treatments
Research InstitutionMIE UNIVERSITY

Principal Investigator

TAMAKI Koreaki  Mie Univ.Faculty of Eng.Professor, 工学部, 教授 (30023047)

Co-Investigator(Kenkyū-buntansha) SUZUKI Jippei  Mie Univ.Faculty of Eng.Associate Professor, 工学部, 助教授 (90111872)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1993: ¥4,500,000 (Direct Cost: ¥4,500,000)
Keywordsheat affected zone / ferrite / austenite transformation / rapid heating / segregation in grain boundary / Cr-Mo steels / austenite grain / grain boundary of prior-austenite / creep test / クリープ試験 / 溶接熱影響部 / Cr-Mo鋼 / 粒界腐食法 / α→γ変態 / 超高速変態再現装置 / 1 1 / 4Cr-1 / 2Mo鋼 / 最高加熱速度 / オーステナイト
Research Abstract

A rapid transformation from fcrrite to austenite occurs in the heat affected zone (HAZ) of a steel when it is arc-welded. Several problems arising in HAZ would be brought about by this transformation. The process of transformation was examined systematically on HAZ of Cr-Mo steel and the following results were obtained.
(1) An experimental method, which used a simulated-HAZ specimen, was newly proposed. A special type of simulator for this experiment was developed in the laboratory, which could produce the heating rate as large as 2000゚C/sec.
(2) The temperature of ferrite/austenite transformation rose with an increasing heating rate. The A_1 temperature in the equilibrium state (740゚C for Cr-Mo steel) rose up to 1120゚C by the rapid heating with 2000゚C/sec.
(3) The following sequence of transforming process was observed in Cr-Mo steel. In the beginning of transformation, fine grains of austenite were produced along the prioraustenite grain boundary. Those grains joined in each other at higher temperature.They grew to a grobular form in the final stage of transformation.
(4) During the transformation, impurity elements, such as phosphorus were concentrated in the grain boundary of newly-produced austenite. The greater the heating rate, the larger the concentration of phosphorus in grain boundary.
(5) An intergranular fracture was observed in the specimen of creep-rupture test. This type of fracture will be brought about by the segregation of impurity elements in the grain boundary of austenite, which was induced by the rapid transformation.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] 玉置維昭: "Fe-P-C合金の急速加熱時のPの偏析過程" 溶接学会論文集. 5. 403-409 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 玉置維昭: "Obsevation of the Transforming Process from Ferrite to Austenite" Proceedings of International Seminar on New Engineering Materials. I. 547-552 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 玉置維昭: "Formation of Austenite Grains and Grain Boundary Segregation in Heating Process of Steel" Research Reports,Faculty of Engineering,Mie Univesity. 18. 21-32 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 玉置維昭: "Types of Temper Embrittlement in HAZ of Cr-Mo Steel Classified by Tempering Time" Documents of International Institute of Welding,IX-1745-94. 1-22 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 玉置維昭: "Low Ductility Creep Fracture in the HAZ of Cr-Mo Steels" Documents of International Institute of Welding,IX-1788-94. 1-27 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 玉置維昭: "Cr-Mo鋼の熱影響部におけるオーステナイト結晶粒の生成および成長過程" 溶接学会論文集. ((発表予定))

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Koreaki TAMAKI: "Segregation Process of phosphorus during Rapid Heating of Fe-P-C Alloy" Quarterly Journal of Japan Welding Society. Vol.5. 403-409 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Koreaki TAMAKI: "Observation of the Transforming Process from ferrite to austenite" Proceedings of the International Seminar on New Engineering Materials. Vol.I. 547-552 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Koreaki TAMAKI: "Formation of Austenite Grains and Grain Boundary Segregation in Heating Process of Steel" Research Reports, Faculty of Engineering, Mie University. Vol.18. 21-32 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Koreaki TAMAKI: "Types of Temper Embrittlement in HAZ of Cr-Mo Steel Classified by Tempering Time" Documents of International Institute of Welding. IX-1745-94. 1-22 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Koreaki TAMAKI: "Low Ductility Creep Fracture in the HAZ of Cr-Mo Steels" Documents of International Institute of Welding. IX-1788-94. 1-27 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Koreaki TAMAKI: "Initiation and Growth of Austenite Grains in the Hcat Affected Zone of Cr-Mo Steels (to be published)" Quarterly Journal of Japan Welding Society.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 玉置,維昭: "Fe-P-C合金の急速加熱時のPの偏析過程" 溶接学会論文集. 5. 403-409 (1987)

    • Related Report
      1994 Annual Research Report
  • [Publications] 玉置,維昭: "Observation of the Transforming Process from Ferrite to Austenite" Proc,International Seminar on New Engineering Materials. I. 547-552 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] 玉置,維昭: "Formation of Austenite Grains and Grain Boundary Segregation in Heating Process of Steel" Research Reports,Faculty of Engineering Mie University. 18. 21-32 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] 玉置,維昭: "Types of Temper Embrittlement in HAZ of Cr-Mo Steel Clossified by Tempering Time" Documents of InTernational Institute of Welding,IX-1745-94. 1-22 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 玉置,維昭: "Low Ductility Creep Fracture in the HAZ of Cr-Mo Steels" Documents of InTernational Institute of Welding,IX-1788-94. 1-26 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 玉置,維昭: "Cr-Mo鋼の熱影響部におけるオーステナイト結晶粒の生成および成長過程" 溶接学会論文集. 発表予定.

    • Related Report
      1994 Annual Research Report
  • [Publications] 玉置維昭: "Observation of the Transforming Process from Ferrite to Austenite" Proc.International Seminar on New Engineering Materials. I. 547-552 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 玉置維昭: "Formation of Austenite Grains and Grain Boundary Segregation in Heating Process of Steel" Research Reports,Faculty of Engineering Mie University. 18. 21-32 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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