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Clarification of the Degradation Mechanism of the Strength of Heat-Resistant Alloys under Random Creep-Fatigue Load at Elevated Temperature

Research Project

Project/Area Number 23KF0003
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeMulti-year Fund
Section外国
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionTohoku University

Principal Investigator

三浦 英生  東北大学, 工学研究科, 教授 (90361112)

Co-Investigator(Kenkyū-buntansha) WANG RUNZI  東北大学, 工学研究科, 外国人特別研究員
Project Period (FY) 2023-04-25 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2023: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywords高温強度 / クリープ疲労損傷 / 原子配列の秩序性 / 電子線後方散乱回折 / 転移密度
Outline of Research at the Start

本研究は,従来の合金結晶粒内の平均的な塑性変形に基づく転位の運動挙動に基づく損傷解析に対し,材料内の微視的結晶組織分布に基づく局所的な歪み場に着目したWeak spot解析という独自の視点を加え,材料内に局在的に発生する歪みエネルギーの集中場を定量的に論じることで破壊の加速現象を整理し,本定義に基づき劣化損傷を定量化するとともに残存寿命を評価するという挑戦を行なうものである.

Outline of Annual Research Achievements

地球温暖化対策の一環として化石燃料の燃焼時に発生するCO2の排出量削減を目的に火力発電システムや航空機ジェットエンジンの稼働温度は熱効率向上に向け高温化する一方である.また,再生可能エネルギーとの共存や航空機の中短距離運行頻度の増加で,燃焼危機に使用される耐熱合金には高温での頻繁な出力変動に起因したクリープ疲労負荷が作用し,劣化損傷の加速に伴う破断寿命の激減が発生し始めている.本研究は,従来の合金結晶粒内の平均的な塑性変形に基づく転位の運動挙動に基づく損傷解析に対し,材料内の微視的結晶組織分布に基づく局所的な歪み場に着目したWeak spot解析という独自の視点を加え,材料内に局在的に発生する歪みエネルギーの集中場を定量的に論じることで破壊の加速現象を整理し,本定義に基づき劣化損傷を定量化するとともに残存寿命を評価するという挑戦を行なったものである.多結晶材料中に存在するWeak spot(再弱点)の同定を定量的に行い,破壊加速機構の定式化に挑戦する.電子線後方散乱回折(EBSD)技術を活用し,多結晶材料内の局所的な劣化損傷過程を可視化することで,このWeak spotの可視化と,着目したWeak spotを収束イオンビームで切り出し,局所強度を電子顕微鏡内での微小引張試験技術で定量的に測定することで,破壊の律速因子を定量的に解明した.これにより材料内部での初期亀裂の発生寿命の定量的評価が可能となり,従来の初期亀裂の存在を仮定した破壊力学に基づくマクロスケールの亀裂進展挙動解析技術と一体化させることで,複数の破壊過程(主として粒内割れと粒界割れ)が混在する複雑な破壊過程を体系的に解釈分析できる評価技術が構築できた.今後,様々な産業分野使用される高温機器の安全で安心な稼働を保証できる革新的な健全性設計技術への展開も期待できる.

Report

(1 results)
  • 2023 Annual Research Report
  • Research Products

    (10 results)

All 2023 2022 Other

All Int'l Joint Research (1 results) Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (3 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (1 results)

  • [Int'l Joint Research] East China U. of Science and Technology(中国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Surrogate-modeling-assisted creep-fatigue reliability assessment in a low-pressure turbine disc considering multi-source uncertainty2023

    • Author(s)
      Run-Zi Wang, Hang-Hang Gu, Yu Liu, Hideo Miura, Xian-Cheng Zhang, Shan-Tung Tu
    • Journal Title

      Reliability Engineering and System Safety

      Volume: 240 Pages: 109550-109550

    • DOI

      10.1016/j.ress.2023.109550

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Geometric discontinuity effect on creep-fatigue behaviors in a nickel-based superalloy hole structure considering ratcheting deformation2023

    • Author(s)
      Lv-Yi Cheng, Run-Zi Wang, Kai-Shang Li, Hai-Long Guo, Le Xu, Ken Suzuki, Hideo Miura, Xian-Cheng Zheng, Shan-Tung Tu
    • Journal Title

      International Journal of Fatigue

      Volume: 175 Pages: 107798-107798

    • DOI

      10.1016/j.ijfatigue.2023.107798

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Microstructural evolutions and life evaluation of non-proportional creep-fatigue considering loading path and holding position effects2023

    • Author(s)
      Le Xu, Run-Zi Wang, YU-Chen Wang, Lei He, Takamoto Itoh, Ken Suzuki, Hideo Miura, Xian^Cheng Zhang
    • Journal Title

      Materials Characterization

      Volume: 204 Pages: 113209-113209

    • DOI

      10.1016/j.matchar.2023.113209

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Oxidation-involved life prediction and damage assessment under generalized creep-fatigue loading conditions based on engineering damage mechanics2022

    • Author(s)
      Run-Zi Wang, Xian-Cheng, Zhang, Hang-Hang, Gu, Kai-Shang Li, Jian-Feng Wen, Hideo Miura, Ken Suzuki, Shan-Tung Tu
    • Journal Title

      J. of Materials Research and Technology

      Volume: 23 Pages: 114-130

    • DOI

      10.1016/j.jmrt.2022.12.094

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evaluation of fatigue and creep-fatigue damage levels on the basis of engineering damage mechanics approach2022

    • Author(s)
      Li Sun, Xian-Cheng Zhang, Run-Zi Wang, Xiao-Wei Wang, Shan-Tung Tu, Ken Suzuki, Hideo Miura
    • Journal Title

      Journal of Fatigue

      Volume: 166 Pages: 103337-103337

    • DOI

      10.1016/j.ijfatigue.2022.107277

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] A new close-loop integration system from process, performance to prediction based on hole-strengthening, life improvement technique2023

    • Author(s)
      Run-Zi Wang
    • Organizer
      ESIA17 FESI/CSIC International Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Ex-situ EBSD Investigations on Creep-Fatigue Damage Evolution Behaviors in Heat-Resistant Alloys2023

    • Author(s)
      Run-Zi Wang
    • Organizer
      11th China-Japan Bilateral Symposium on High Temperature Strength of Materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Creep-fatigue crack nucleation criterion for crystallographic evolutions based on damage mechanics descriptions2023

    • Author(s)
      Run-Zi Wang
    • Organizer
      13th International Fatigue Congress
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Remarks] Miura-Suzuki Laboratory

    • URL

      http://www.miura.rift.mech.tohoku.ac.jp

    • Related Report
      2023 Annual Research Report

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Published: 2023-04-26   Modified: 2024-12-25  

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