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Creation of Easy-to-Recycle Sintered Steels. Replacement of Copper Addition to Boron.

Research Project

Project/Area Number 11450276
Research Category

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

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionHiroshima University

Principal Investigator

KUROKI Hidenori  Faculty of Engineering, Hiroshima University, Professor, 工学部, 教授 (80037853)

Co-Investigator(Kenkyū-buntansha) SUZUKI Hiroyuki  Faculty of Engineering, Hiroshima University, Research Associate, 工学部, 助手 (90284158)
SHINOZAKI Kenji  Faculty of Engineering, Hiroshima University, Associate Professor, 工学部, 助教授 (70154218)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 2000: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1999: ¥5,700,000 (Direct Cost: ¥5,700,000)
Keywordsrecycle / sintered material / boron / Fe-B-C eutectic / mechanical property
Research Abstract

A boron of 0.03-0.125mass% and a carbon of 0-1mass% are simultaneously added in iron powder to promote sintering by forming a eutectic melt of Fe-B-C during heating. Sintering conditions are varied in temperature of 1380-1440 K and in holding time of 0-180 min. The dimensional change during sintering is observed by a dilatometer. The presence of eutectic melt during sintering has been verified by the observation with optical microscope and SEM.The tensile strength and elongation of sintered materials are measured. Some specimens are subjected to post-sintering heat treatment of quenching and annealing to improve mechanical properties.
The results are as follows.
(1) The simultaneous addition of boron and carbon in iron powder forms eutectic melt at and above 1410 K.The differential dilatometric curve of Fe-0.05mass%B-1.0mass%C material coincides well to that of conventional copper added sintered steel. The coincidence would be the result of the occurrence of nearly the same amount of eutectic melt as well as the expansion of ferrite with the solid solution of carbon.
(2) The eutectic forms three dimensional network between iron particles. With slow cooling rate, the boundary with eutectic behaves as the precipitating site of Fe_3C during γ-α phase transformation. Therefore, the outer part of iron particles becomes ferrite and only the center part of the particles forms pearlite.
(3) The tensile strength of both boron and carbon doped materials mainly depends on the amount of pearlite or ferrite, which vary with the effective amount of carbon, than the amount of the eutectic. The excessive addition of boron reduces effective amount of carbon. With a boron of 0.1mass% or more, the strength decreases.
(4) Fe-0.05mass%B-1.0mass%C material can sinter at 1440 K with a microstructure consists of the eutectic and pearlite with a small amount of ferrite, which results good mechanical properties. The strength of this material can be improved by quenching and annealing.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] H.Kuroki: "Role of Cu in Fe-Cu-CP/M Steel and Replacement of Cu with B"Proceedings of the 1998 PM World Congress and Exhibition. Vol.3. 293-298 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kuroki: "Boron for Liquid Phase Sintering of Low Alloy Steel"Sintering Science and Technology,edited by R.M.German,G.L.Messing,and R.G.Cornwall,Penn-State Univ.. 301-306 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kuroki et al.: "Role of Cu in Fe-Cu-C P/M Steel and Replacement of Cu with B"Proceedings of the 1998 PM World Congress and Exhibition. Vol.3. 293-298 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kuroki et al.: "Boron for Liquid Phase Sintering of Low Alloy Steel"Sintering Science and Technology, edited by R.M.German, G.L.Messing, and R.G.Cornwall, Penn-State Univ.. 301-306 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kuroki: "Role of Cu in Fe-Cu-C P/M Steel and Replacement of Cu with B"Proceedings of the 1998 PM World Congress and Exhibition. Vol.3. 293-298 (1998)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Kuroki: "Boron for Liquid Phase Sintering of Low Alloy Steel"Sintering Science and Technology, edited by R.M.German, G.L.Messing, and R.G.Cornwall, Penn-State Univ.. 301-306 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H. Kuroki: "Role of Cu in Fe-Cu-C PAM Steel and Replacement. of Cu with B"Proceedings of the 1998 PM World Congress and Exhibition. 1.3. 293-298 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] H. Kuroki: "Boron for Liquid Phase Sintering of LowAlloySteel"Sintering Technologies 1999, edited by R. M. German, G. L. Messing, and R. G. Cornwall, Plenum Press, New York. (印刷中).

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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