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Increased Mechanical Properties of Fe-0.6C-1.5Si-0.8Mn Materials Through Mixed-Structure Control

Research Project

Project/Area Number 08650820
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionOsaka Prefecture University

Principal Investigator

TOMITA Yoshiyuki  Osaka Prefecture University College of Engineering Professor, 工学部, 教授 (70081370)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1996: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsModified heat treatment / Interrupted quench / Triple phases / Upper bainite / Retained austenite / Tempered martensite / Mechanical properties / Transformation-Induced plasticity (TRIP) / 破壊じん性(J_<IC>) / 疲れ強さ / 変態誘起塑性 / オーステナイトの安定性
Research Abstract

Modified heat treatment effects on the microstructure, tensile properties, slow bend and impact toughness, fracture toughness and fatigue properties of Fe-0.6C-1.5Si-0.8Mn steel have been studied with the aim of developing the mechanical properties of environmental conscious material Fe-C-Si-Mn steel through mixed-structure control As a result of the investigation, Fe-C-Si-Mn TRIP (533K-IQ-Aus) steel has been suggested whereby the mechanical properties were improved. The results are summarized as follows : (1) The microstructure of modified heat treated steels consisted of triple phases of carbide-free upper bainite, retained austenite and tempered martensite. The results are summarized : (2) Compared to the Con-Aus, the 533KIQ-Aus significantly improved total elongation by twice with increased strength : (3) From the result of true-stress-strain diagram, X-ray analysis of the carbon content in the retained austenite (gamma) and determination of mechanical stability of the gamma, a rem … More arkable increase in elongation of the 533KIQ-Aus steel can be attributed to the fact that as a result of low temperature aging of gamma, transformation-induced plasticity (TRIP) occurred effectively during plastic deformation : (4) There was little difference between the slow bend and Charpy impact energies of the 533KIQ-Aus and Con Aus steels : (5) Compared to the Con-Aus, the 533KIQ-Aus increased J_<IC> but the 493KIQ-Aus decreased : (6) An increase in J_<IC> of the 533KIQ-Aus steel was due to the fact that stress relief at the crack tip occurred through TRIP : (7) The decrease in the 493KIQ-Aus steel was due to the embrittling effect of tempered martensite introduced by interrupted quenching : (8) Compared to the Con Aus steel, the 533KIQ-Aus steel increased fatigue stress by one-half and decreased notch sensitivity : (9) The 493KIQ-Aus steel increased fatigue stress by two-half compared with that of the Con Aus steel but significantly decreased notch sensitivity : (10) There was little difference between crack propagation rate of the 533K and Con-Aus steels. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Y.Tomita: "Effect of Bainite Transformation on Microstructure of Si-Mn Steel" Journal of Materials Science. 29. 2605-2610 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita: "Effect of Bainite Transformation on Mechanical Properties of 0.6C-Si-Mn Steel" Journal of Materials Science. 30. 105-110 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita and N.Ishiza: "Improved Tensile Properties of Fe-0.6C-1.5Si-0.8Mn Steel Through Modified Austempering Treatment" Zeitschrift fur Metallkunde. 86. 575-579 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita: "Improved Tensile Properties of Fe-0.6C-1.5Si-0.8Mn Steel Through Austempering Coupled with Interrupted Quenching" Zeitschrift fur Metallkunde. 86. 750-753 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita and K.Morita: "Effect of Microstructure on Transformation-Induced Plasticity of Silicon-Containing Low-Alloy Steel" Materials Characterization. 38. 243-250 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita, F.Kijima T.Mokuo and K.Morita: "Modified Austempering Effects on Fe-0.6C-1.5Si-0.8Mn Steel" Bulletin of Osaka Prefecture University. 46. 125-131 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita: "Effect of Bainite Transformation on Microstructure of Si-Mn Steel" J.Mater.Sci.vol.29. 2605-2610 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita: "Effect of Bainite Transformation on Mechanical Properties of 0.6C-Si-Mn Steel." J.Mater.Sci.vol.30. 105-110 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita and N.Ishiza: "Improved Tensile Properties of Fe-0.6C-1.5Si-0.8Mn Steel Through Modified Austempering Treatment" Z.Metallkd.vol.86. 575-579 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita: "Improved Tensile Properties of Fe-0.6C-1.5Si-0.8Mn Steel Through Austempering Coupled with Interrupted Quenching Treatment" Z.Metallkd.vol.86. 750-753 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita and K.Morioka: "Effect of Microstructure on Traansformation-Induced Plasticity of Silicon-Containing Low-Alloy Steel" Mater.Charact.vol.38. 243-250 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita, F.Kijima, T.Mokuo and K.Morioka: "Modified Austempering Effects on Fe-0.6C-1.5Si-0.8Mn Steel" Bull.Osaka Pref.Univ.vol.46, No.2. 125-131 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tomita and N.Ishiza: "Improved Tensile Properties of Fe-0.6C-1.5Si-0.8Mn Steel Through Modified Austempewring Treatment" Zeitschrift fur Metallkunde. Vol.86 No.8. 575-579 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Tomita: "Improved Tensile Properties of Fe-0.6C-1.5Si-0.8Mn Steel Through Austempering Coupled with Interrupted Quenching Treatment" Zeitshrift fur Metallkunde. Vol.86 No.11. 750-753 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Tomita and K.Morioka: "Effect of Microstructure on Transformation-Induced Plasticity of Silicon-Containing Low-Alloy Steel" Materials Characterization. Vol.38. 243-250 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Tomita,F.Kijima T.Mokuo and K.Morioka: "Modified Austempering Effects on Fe-0.6C-1.5Si-0.8Mn Steel" Bulletin of Osaka Prefecture University,Series A. Vol.46 No.2. 125-131 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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