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Effect of Water Vapor Pressure on Environment Embrittlement of Spheroidal Graphite Cast Iron.

Research Project

Project/Area Number 10650699
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionMuroran Institute of Technology

Principal Investigator

OSAFUNE Yasuhiro (1999)  Dept. of Eng., Research Associate, 工学部, 助手 (30241409)

田中 雄一 (1998)  室蘭工業大学, 工学部, 教授 (20002892)

Co-Investigator(Kenkyū-buntansha) 長船 康裕  室蘭工業大学, 工学部, 助手 (30241409)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsSpheroidal graphite cast iron / Hydrogen embrittlement / Environment embrittlement / Water vapor / ADI / Water embrittlement / 水蒸気分圧 / 破壊靭性 / 疲労試験
Research Abstract

"Water embattlement" phenomenon under the steam circumstance in the high strength nodular graphite cast iron was examined. The following results were obtained.
The embattlement phenomenon by the water was remarkable with the high strength nodular graphite cast iron (pearlite, martensite, austempering nodular graphite cast iron).
After plastic deformation is done in the water adhesion condition, increase in hydrogen volume is confirmed as a result of doing hydrogen analysis, and it is considered that this embattlement is attributable to the hydrogen brittleness.
(1) Tensile characteristics in the vacuum are higher value than the atmosphere inside of the drying condition (humidity of 0%).
(2) Tensile characteristics decline in accordance with the rise in the steam pressure. But, that decline volume is small in comparison with the water adhesion condition.
(3) The critical steam pressure which the embattlement of the grade which was the same as the water adhesion condition evaluated didn't exist.
Tensile strength in the drying and wet (more than humidity of 95%) hydrogen gas atmosphere was examined. The following results were obtained.
(1) Wet hydrogen gas atmosphere embattles more remarkably than dry hydrogen gas.
(2) The effect to the embattlement of the strain rate is small.
(3) There is critical exposure time in the inside of the atmosphere which evolutes embattlement.
(4) Graphite in the cast iron affects in the remarkable embattlement phenomenon in wet hydrogen gas.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 蔡啓舟(室工大院): "球状黒鉛鋳鉄の引張特性に及ぼす長時間水浸せきの影響"鋳造工学. Vol.71. 411-417 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 蔡啓舟(室工大院): "オーステンパ球状黒鉛鋳鉄の水脆化に及ぼす黒鉛粒径の影響"鋳造工学. Vol.71. 679-684 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 田中雄一: "水環境におけるオーステンパ球状黒鉛鋳鉄の疲れ特性"鋳造工学. Vol.71. 698-703 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yuichi Tanaka: "Effect of Exposure to Water on the Fracture Toughness of Austempered Graphite Cast Iron"Proceedings of 63rd World Foundry Congress,Hungarian Mining and Metallurgical Society. 12-18 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yuichi Tanaka: "Effect of Exposure to Water on the Fracture Toughness of Austempered Graphite Cast Iron"6th International Symposium, Science and Processing of Cast Iron, Birmingham, USA. 30 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shinichiro Komatsu(Kinki Univ.): "Embrittlement Characteristics of Fracture Toughness by Contact with Water in Ductile Iron"International Journal of Cast Metals research. Vol.11. 539-544 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Qizhou Cai: "Tensile Properties of Spheroidal Graphite Cast lron Exposed to Long Term Water Immersion"Journal of Japan Foundry Engineering Society. Vol.71. 411-417 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Qizhou Cai: "Effects of Graphite Nodule Diameter on Water Embrittlement of Austempered Spheroidal Cast Iron"Journal of Japan Foundry Engineering Society. Vol.71. 679-684 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yuichi Tanaka: "Fatigue Properties of Austempered Spheroidal Graphite Cast Iron in Water Environment"Journal of Japan Foundry Engineering Society. Vol.71. 698-703 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yuichi Tanaka: "Effect of Exposure to Water on the Fracture Toughness of Austempered Graphite Cast Iron"Proceedings of 63rd World Foundry Congress, Hungarian Mining and Metallurical Society. 12-18 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yuichi Tanaka: "Effect of Exposure to Water on the Fracture Toughness of Austempered Graphite Cast Iron"th International Symposium, Science and Processing of Cast Iron, Birmingham, USA. 30-30 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shinichiro Komatsu (Kinki Univ.): "Embrittlement Characteristics of Fracture Toughness by Contact with Water in Ductile Iron"International Journal of Cast Metals research. Vol.11. 539-544 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 蔡啓船(室工大院): "球状黒鉛鋳鉄の引張特性に及ぼす長時間水浸せきの影響"鋳造工学. Vol.71. 411-417 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 蔡啓船(室工大院): "オーステンパ球状黒鉛鋳鉄の水脆化に及ぼす黒鉛粒径の影響"鋳造工学. Vol.71. 679-684 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 田中雄一: "水環境におけるオーステンパ球状黒鉛鋳鉄の疲れ特性"鋳造工学. Vol.71. 698-703 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yuichi Tanaka: "Effect of Exposure to Water on the Fracture Toughness of Austempered Graphite Cast Iron"Proceedings of 63rd World Foundry Congress, Hungarian Mining and Metallurgical Society. 12-18 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yuichi Tanaka: "Effect of Exposure to Water on the Fracture Toughness of Austempered Graphite Cast Iron"6th International Symposium, Science and Processing of Cast Iron, Birmingham, USA. 30 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Shinichiro Komatsu (Kinki Univ.): "Embrittlement Characteristics of Fracture Toughness by Contact with Water in Ductile Iron"International Journal of Cast Metals Research. Vol.11. 539-544 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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