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Crystallographic Orientation and Chemical Composition Dependence of Creep and High Temperature Fatigue Strength of Single Crystals of Ni-Base Superalloys.

Research Project

Project/Area Number 62460076
Research Category

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

Allocation TypeSingle-year Grants
Research Field 機械材料工学
Research InstitutionTokyo Metropolitan University

Principal Investigator

SAKAKI Tsuneaki  Department of Mechanical Engineering, Faculty of Technology, Tokyo Metropolitan University, Professor., 工学部, 教授 (50083332)

Co-Investigator(Kenkyū-buntansha) KAKEHI Koji  Department of Mechanical Engineering, Faculty of Technology, Tokyo Metropolitan, 工学部, 助手 (70185726)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1987: ¥7,300,000 (Direct Cost: ¥7,300,000)
KeywordsNi-base super alloy / single crystal / yield strength / creep strength / fatigue strength / Orientation dependence of strength. / クリープ強度 / 高温疲労強度 / 結晶方位 / 強化元素
Research Abstract

A. The purpose of the present study
The purpose of the present study is to examine the orientation dependence of yield, creep and fatigue strengths of single crystals of Ni-base superalloys with different chemical compositions, and to show the alloy with excellent properties for practical use.
B. Procedures and results of the present study
1) Materials: Three kinds of Ni-base superalloys, 1) Al-Ti-Ta type, 2) Al-Ti-V type, 3) Al-Si type.
2) Tensile tests: Single crystals of the three kinds of alloys were subjected to tensile tests at room temperature up to 1000゚C. Orientation dependences of proof stress and CRSS were examined. Around 700゚C, the [001] orientation had the highest strength in three kinds of alloys. At 900゚C and 1000゚C, the alloys 2 and 3 had the highest strength in the [001], while the alloy 1 exhibited the highest strength in the [115] and [014] orientations.
3) Creep strength: The alloys 1 and 2 were subjected to creep tests. Typical five orientations with low indices were s … More elected as the initial tensile orientations. Testing temperatures were 700゚C and 9000゚C. At 7000゚C, the [001] exhibited the longest rupture times compared with those of the other orientations in both the alloys 1 and 2. At 9000゚C, however, the [113] or [111] showed longer rupture times than the [001]. The alloy 1 had longer rupture times compared with the alloy 2, if compared in the same testing conditions.
4) High temperature fatigue: The high cycle fatigue tests were performed at 7000゚C using the alloy 1 with the orientations of [001], [011] and [111]. The form of applied stress was a perfectly antisymmetric triangular form in tension.
The frequency was 5Hz. The S-N curves of the three orientations were resembled each other. Thus, it was found that the orientation dependence of fatigue strength is small.
C. Conclusions: According to the previous studies, it has been reported that the [001] orientation is the strongest orientation. In the present study, however, the different results have been obtained, i.e. the orientation dependence of yield strength, that of creep strength and that of fatigue strength were different each other. In both the yield strength and creep strength, the alloy 1 exhibited higher strengths compared with the alloy 2 in the same testing condition. Less

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 筧幸次,坂木庸晃,田仲高志: "Ni基超耐熱合金単結晶の高温強度の結晶方位依存性" 材料とプロセス(日本鉄鋼協会講演論文集). 第2巻. 893 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 筧幸次,坂木庸晃,足立徹,高橋克典: "Ni_3(Al、Si)析出強化型Ni基超耐熱合金単結晶の高温強度の結晶方位依存性" 材料とプロセス(日本鉄鋼協会講演論文集). 第2巻. 1954 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 筧幸次,坂木庸晃,足立徹,高橋克典: "析出強化型Ni基超耐熱合金単結晶の高温強度の結晶方位依存性" 材料とプロセス(日本鉄鋼協会講演論文集). 第2巻. 1955 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 坂木庸晃,筧幸次,足立徹,高橋克典: "Ni基超合金単結晶の高温引張り特性の結晶方位依存性" 日本学術振興会耐熱金属材料第123委員会研究報告. 第31巻. 55-64 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T.Sakaki,K.Kakehi,T.Adachi,T.Tanaka.: "Orientation dependence of Tensile Properties of Single Crystals of Ni-Base Superalloys" Fourth International Conference on Creep and Fracture of Engineering Materials and Structures,held on April 1-6,1990,at Swansea University College,United Kingdom.10 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Koji KAKEHI, Tsuneaki SAKAKI and Takashi TANAKA: "Crystallographic Orientation Dependence of High-temperature Strength of Single Crystals of Ni-base Superalloy" Current Advances in Materials and Processes, Report of the ISIJ Meeting, Vol. 2 (1989), p.893.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Koji KAKEHI, Tsuneaki SAKAKI, Tohru ADACHI and Katsunori TAKAHASHI: "Crystallographic Orientation Dependence of High-temperature Strength of Ni_3 (Al, Si) Precipitation-hardened Single Crystals of Ni-base Superalloy" Current Advances in Materials and Processes, Report of the ISIJ Meeting, Vol. 2 (1989), p.1954.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Koji KAKEHI, Tsuneaki SAKAKI, Tohru ADACHI and Katsunori TAKAHASHI: "Crystallographic Orientation Dependence of High-temperature Strength of Precipitation-hardened Single Crystals of Ni-base Superalloy" Current Advances in Materials and Processes, Report of the ISIJ Meeting, Vol. 2 (1989), p.1955.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Tsuneaki SAKAKI, Koji KAKEHI, Tohru ADACHI and Takashi TANAKA: "Orientation dependence of Tensile Properties of Single Crystals of Ni-Base Superalloys." Report of the 123rd Committee on Heat-Resisting Metals and Alloys, Japan Society for the Promotion of Science, Vol. 31 (1990), pp.55-64.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Tsuneaki SAKAKI, Koji KAKEHI, Tohru ADACHI and Takashi TANAKA: "Orientation dependence of Tensile Properties of Single Crystals of Ni-Base Superalloys." Fourth International Conference on Creep and Fracture of Engineering Materials and Structures, held on April 1-6, 1990, at University College of Swansea, United Kingdom. (10 pages).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 筧幸次,坂木庸晃,田仲高志: "Ni基超耐熱合金単結晶の高温強度の結晶方位依存性" 材料とプロセス(日本鉄鋼協会講演論文集). 第2巻. 893 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 筧幸次,坂木庸晃,足立徹,高橋克典: "Ni_3(Al,Si)析出強化型Ni基超耐熱合金単結晶の高温強度の結晶方位依存性" 材料とプロセス(日本鉄鋼協会講演論文集). 第2巻. 1954 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 筧幸次,坂木庸晃,足立徹,高橋克典: "析出強化型Ni基超耐熱合金単結晶の高温強度の結晶方位依存性" 材料とプロセス(日本鉄鋼協会講演論文集). 第2巻. 1955 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 坂木庸晃,筧幸次,足立徹,田仲高志: "Ni基超合金単結晶の高温引張り特性の結晶方位依存性" 日本学術振興会 耐熱金属材料第123委員会 研究報告. 第31巻. 55-64 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Sakaki,K.Kakehi,T.Adachi,T.Tanaka: "Orientation dependence of Tensile Properties of Single Crystals of NiーBase Superalloys" Fourth International Conference on Creep and Fracture of Engineering Materials and Structures,held on April 1-6,1990,at Swansea University College,United Kingdom.10 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 筧幸次、坂木庸晃、田仲高志: 材料とプロセス. 2. No.2p.893 (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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