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1992 Fiscal Year Final Research Report Summary

Improvement of Formability by Moderate Temperature Forming and Thermo-mechanical Process and Examination of Fatigue Properties of TRIP-aided Dual-phase Steel Sheets.

Research Project

Project/Area Number 03805060
Research Category

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

Allocation TypeSingle-year Grants
Research Field 金属加工(含鋳造)
Research InstitutionFaculty of Textile Science and Technology, Sinshu University

Principal Investigator

SUGIMOTO Koh-ichi  Faculty of Textile Science and Technology, Sinshu University. Functional Machinery and Mechanics. Associate Professor, 繊維学部, 助教授 (50094272)

Co-Investigator(Kenkyū-buntansha) KOBAYASHI Mitsuyuki  Faculty of Engineering, Shinshu University. Mechanical Systems. Professor, 工学部, 教授 (80021020)
Project Period (FY) 1991 – 1992
KeywordsDual-phase steel / High strength steel / Retained austenite / TRIP / Stretch forming / Stretch flanging / Moderate temperature / Thermomechanical process / Low cycle fatigue
Research Abstract

TRIP-aided dual-phase steels (TDP steels) have been developed to improve safety and fuel efficiency by reducing vehicle weight. The purpose of the present investigation is to improve stretch-formability and stretch-flange-ability and to examine fatigue strength of TDP steels.
The stretch-formability and stretch-flangeability of TDP steels were improved by moderate temperature forming at 20゚C to 200゚C. The lower Ms temperature of the retained austenite, the greater these formability and the lower the optimum forming temperature. Thermo-mechanical process in alpha+gamma region gave a significant amount of retained austenite and fine microstructure, but increased the retained austenite Ms temperature, particularly for low manganese and low sili-con steels.
Great fatigue hardening appeared for TDP steels owing to strain induced transformation of the retained austenite and internal stress resulting from a difference of strength between matrix and second phase. The fatigue hardening decreased with increasing testing temperature. Higher fatigue limit compared to that of a conventional dual-phase steel was obtained at 100 to 200゚C. The reason is under investigation.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 杉本公一: "TRIP型複合組織鋼の微細組織に対する(α+γ)2相域加工熱処理の効果" 材料とプロセス(CAMP-ISIJ). 4. 1947 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 杉本公一: "変態誘起塑性(TRIP)型複合組織鋼の繰り返し変形挙動" 日本機械学会講演論文集. 910-62A. 146-148 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 杉本公一: "TRIP型複合組織鋼の温間張り出し成形" 材料とプロセス(CAMP-ISIJ). 5. 1895 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 杉本公一: "TRIP型複合組織鋼板の延性に対する残留オーステナイトの体積率と安定性の影響" 鉄と鋼. 78. 1480-1487 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Koh-iuhi Sugimoto: "Effcl of Volume Fraction and Stability of Reaiued Austenite on Ductility in TRIP-aidid Dud-phase Steel Sheets." ISIJ Interrrational. 32. 1311-1318 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 杉本公一: "TRIP型複合組織鋼の微細組織に及ぼす2相域加工熱処理の効果(第2報加工温度と化学組成の影響)" 材料とプロセス(CAMP-ISIJ). 6. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Koh-ichi Sugimoto et al.: "Effect of thermo-mechanical Process in alpha+gamma Region on Microstructure of TRIP-aided Dual-phase steels" CAMP-ISIJ. Vol. 4. 1947 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koh-ichi Sugimoto et al.: "Cyclic Deformation Behavior of TRIP-aided Dual-phase steels" The 69th JSME Fall Annual・Meeting. No. 910-62A. 146-8 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koh-ichi Sugimoto et al.: "Warm Stretch Forming of TRIP-aided Dual-phase Steels" CAMP-ISIJ. Vol. 5. 1895 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koh-ichi Sugimoto et al.: "Effect of Volume Fraction and Stability of Retained austenite on Ductility in TRIP-aided Dual-phase steel Sheets" Tetsu-to-Hagane. 78. 1480-87 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koh-ichi Sugimoto et al.: "Effect of Volume Fraction and Stability of Retained austenite on Ductility in TRIP-aided Dual-phase steel Sheets" ISIJ International. 32. 1311-18 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koh-ichi Sugimoto et al.: "Effects of Thermomechanical Process in alpha+gamma Region on Microstructure in TRIP-aided Dual-phase steels (Rffects of Forming Temperature and Chemical Composition: Part-2)" CAMP-ISIJ. Vol. 6. (1993)

    • 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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