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ENVIRONMENTAL STRENGTH OF TRIP STEELS WITH RETAINED AUSTENITE POSSESSING HIGH DUCTILITY AND HYDROGEN-EMBRITTLEMENT RESISTANCE.

Research Project

Project/Area Number 05650664
Research Category

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

Allocation TypeSingle-year Grants
Research Field Structural/Functional materials
Research InstitutionMURORAN INSTITUTE OF TECHNOLOGY

Principal Investigator

MISAWA Toshihei  MURORAN INSTITUTE OF TECHNOLOGY,PROFESSOR., 工学部, 教授 (70005982)

Co-Investigator(Kenkyū-buntansha) SAITOH Hideyuki  MURORAN INSTITUTE OF TECHNOLOGY,LECTURER., 工学部, 助教授 (00235061)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsRetained Austenite / TRIP Steels / Ductile Brittle Transition / DBTT / Environmental Strength / Hydrogen Embrittlement / Small Specimen Test Technique / High Strength Sheet Steels / 高強度鋼
Research Abstract

The small specimen test technique (SSTT) using miniaturized specimens has been performed for high strength sheets of retained-austenite transformation induced plasticity, martensitic and austenitic steels and laser weld joint to evaluate ductile-brittle transition behavior and hydrogen embrittlement resistance, in comparison with the intermetallics having high susceptibility to hydrogen embrittlement. The small punch (SP) test using a small specimen in the form of 10 x 1 0 x 0.5 mm demonstrated different behavior of ductile-brittle transition, low lemperature ductility and the temperature-dependence Weibull distribution shape parameter and dispersion in SP fracture energies, for two different contents of retained austenitic TRIP steels. An impact testing for the toughness evaluation of local microstructures in laser weld joint using miniaturized v-notch specimens of 0.7,1.0,1.0 mm^2 in square and 20 mm in long has been successfully constructed and a linear correlation between the DBTT … More measured by standard Charpy-impact test and that by the small specimen test has been clarified.
The resistance to hydrogen embrittlement of prestressed concrete steels has been largely improved by the addition of Si and Ni with quench-tempered heat treatment. The hydrogen induced ductility loss in the sensitized Type 316 stainless steels has been accompanied by the brittle intergranular cracking and enhanced ductile rapture along grain boundaries at below and above room temperature, respectively. High susceptibility to hydrogen embrittlement in the sensitized Type 316 SS has been attributed to the grain boundary precipitation relating phenomena such as the weakening of interface bonding between carbides and matrix and the martensitic transformation in the Cr-depleted zone near grain boundaries. Behavior and suppression of hydrogen environmental embrittlement in Co_3Ti intermetallic compound have been inbestigated by means of the SP test, electrochemical measurements and tritium autoradiography. The mechanism of the suppression by the additionof Fe is to reduce a supply of hydrogen from the surface to the interior of Co_3Ti due to the increase of hydrogen desorption rate resulting from the enhancement of hydrogen recombination. Less

Report

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

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 斎藤 英之: "金属間化合物Co_3Tiの環境脆化抑制に及ぼす雰囲気およびFe添加の効果" 軽金属. 44. 635-640 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Akihiko KIMURA: "Hydrogen Induced Cracking in Type 316 Stainless Steels for International Thermonuclear Experimental Reactor" Materials Transactions,JIM. 34. 1097-1107 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Toshihei MISAWA: "Hydrogen Electrode Behavior of Co_3Ti,TiAl and Ti_3Al Intermetallics Having Environmental Embrittlement Susceptibility" Proc.3rd Japan International SAMPE Symposium. 1438-1443 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 三沢 俊平: "小型パンチ(SP)試験法によるTRIP薄鋼板の延性脆性遷移特性の評価" 鉄と鋼. (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] 三沢 俊平: "微小衝撃試験片法によるレーザー溶接部の延性脆性遷移特性の評価" 鉄と鋼. (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] Hideyuki SAITOH et al.: "Effects Of Atmosphere and Fe Addition on Suppression of Environmental Embrittlement in Co_3Ti Intermetallic Compound." KEIKINZOKE (J.Japan Institute of Light Metals). 44. 635-640 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Akihiko KIMURA et al.: "Hydrogrn Induced Cracking in Type 316 Stainless Steels forinternational thermonuclear Exerimental Reactor." Materials Transactions, JIM. 34. 1097-1105 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Toshihei MISAWA et al.: "Hydrogrn Electrobe Behavior of Co_3Ti, TiAl and Ti_3Al Intermetallics Having Environmental Embrittlement Susceptibility" Porc.3rd Japan International SAMPE Symposium. 1438-1443

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Toshihei MISAWA: "Evaloation of Dutctile-Brittle Transition Behavior of TRIP Sheet Steels by Small Punch Test" TETSU-TO-HAGANE (ISIJ). (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Toshihei MISAWA: "Evaloation of dutctile-Brittle Transition Characteristics of Different Microstructures in Laser Weld Joint by Small Specimen Impact Test" TETSU-TO-HAGANE (ISIJ). (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 斉藤英之: "金属間化合物Co_3Tiの環境脆性抑制に及ぼす雰囲気およびFe添加の効果" 軽金属. 44. 635-640 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Akihiko KIMURA: "Hydrogen Induced Cracking in Type 316 Stainless Steels for International Thermonuclear Experimental Reactor" Materials Transactions,JIM. 34. 1097-1107 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Toshihei MISAWA: "Hydrogen Electrode Behavior of Co_3Ti,TiAl Intermetallics Having Environmental Embrittlement Susceptibility" Proc.3rd Japan International SAMPE Symposium. 1438-1443 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Akihiko KIMURA: "Hydrogen Induced Cracking in Type316 Stainless Steels for International Thermonuclear Experimental Reactor" Materials Transactions,JIM. 34. 1097-1105 (1993)

    • Related Report
      1993 Annual Research Report

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

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