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Investigation of hydrogen embrittlement characteristics of strech-formed steel based on stress, strain, hydrogen diffusion distribution analysis

Research Project

Project/Area Number 22K14497
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 26040:Structural materials and functional materials-related
Research InstitutionTohoku University

Principal Investigator

Ajito Saya  東北大学, 金属材料研究所, 助教 (20903834)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords鉄鋼材料 / 水素脆化 / 水素可視化 / プレス成形 / 高強度鉄鋼材料 / 応力 / ひずみ
Outline of Research at the Start

高強度鉄鋼材料の安全な実用化に向けて,実用環境下における水素脆化特性の解明が希求されている.なかでも,プレス成形して使用される高強度鋼板(プレス成形鋼板)は,成形により残留応力・塑性ひずみが不均一に導入され,これらの影響を受けて水素拡散挙動に分布が生じる.そのため,プレス成形鋼板の水素脆化特性を解明するためには,プレス成形鋼板特有の3つの水素脆化影響因子(残留応力,塑性ひずみ,水素拡散)の分布の検討が肝要となる.そこで本研究では,新規な水素可視化技術も用いた水素分布計測と有限要素法を用いた残留応力,塑性ひずみ解析に基づき,プレス成形鋼板の水素脆化特性の支配因子を解明する.

Outline of Final Research Achievements

In order to elucidate the hydrogen embrittlement characteristics of press-forming steel sheets, a hydrogen visualization technique that can applied to specimens with uneven surfaces was developed. The Ir complex film was formed on the specimen surfaces by a spray method and the hydrogen diffusion behavior in the stretch-formed specimen was analyzed using the color change of the Ir complex upon reaction with hydrogen. The distribution of hydrogen diffusion behavior corresponding to the plastic strain introduced into the stretch-formed specimen was successfully analyzed.

Academic Significance and Societal Importance of the Research Achievements

本研究では、凹凸のある試験片へ適用可能な水素可視化法の開発に成功した。この水素可視化法を用いることで、プレス成形鋼板のような実用部材について水素脆化割れの影響因子の一つである水素拡散挙動解析が可能となる。その結果、プレス成形を施された鉄鋼材料の水素脆化特性の解明や水素脆化割れしにくい材料開発への貢献が期待される。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (10 results)

All 2024 2023 2022

All Presentation (10 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results)

  • [Presentation] 焼戻しマルテンサイト鋼中の水素拡散挙動に与える応力の影響2024

    • Author(s)
      味戸 沙耶,柿沼 洋,北條智彦、小山 元道,原卓也、大村朋彦、秋山 英二
    • Organizer
      日本鉄鋼協会第187回春季講演大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] HYDROGEN DIFFUSION BEHAVIOR IN TEMPERED MARTENSITIC STEEL : EFFECT OF STATIC LOADING2024

    • Author(s)
      S. Ajito, H. Kakinuma, T. Hojo, M. Koyama, T. Hara, T. Omura, E. Akiyama
    • Organizer
      24th European Conference on Fracture (ECF24)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 鉄鋼材料中の水素拡散・固溶に与える変形の影響2023

    • Author(s)
      味戸沙耶、張笑銘、柿沼洋、北條智彦、小山元道、秋山英二
    • Organizer
      日本鉄鋼協会186回秋季講演大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 電気化学的手法を用いた変形中における鉄鋼材料中の水素の挙動解析2023

    • Author(s)
      味戸沙耶
    • Organizer
      電気化学会東北支部 第36回東北若手の会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Visualization of Hydrogen permeated through stretch-formed high strength steel using an iridium complex2022

    • Author(s)
      S. Ajito, H. Nishimura, T. Hojo, M. Koyama, K. Fujita, Y. Shibayama, H. Kakinuma, and E. Akiyama
    • Organizer
      2nd Int. Symposium “Hydrogenomics”
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Electrochemical detection of hydrogen desorption during deformation in austenitic stainless steels2022

    • Author(s)
      S. Ajito, T. Hojo, M. Koyama, and E. Akiyama
    • Organizer
      ECF23, European conference on fracture 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Hydrogen diffusion behavior in a stretch-formed high strength steel2022

    • Author(s)
      H. Nishimura, S. Ajito, T. Hojo, M. Koyama, K. Fujita, Y. Shibayama, H. Kakinuma, and E. Akiyama
    • Organizer
      ECF23, European conference on fracture 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Hydrogen diffusion behavior in iron under static loading2022

    • Author(s)
      X. Zhang, S. Ajito, T. Hojo, M. Koyama, and E. Akiyama
    • Organizer
      ECF23, European conference on fracture 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ir錯体を用いた張出し成形高強度鋼板の水素拡散挙動解析2022

    • Author(s)
      味戸沙耶,西村隼杜,北條智彦,小山元道,藤田健一、柴山由樹、柿沼洋、秋山英二
    • Organizer
      日本鉄鋼協会第184回秋季講演大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Hydrogen diffusion analysis in a stretch-formed high-strength steel sheet with an Ir complex2022

    • Author(s)
      味戸沙耶,西村隼杜,北條智彦,小山元道,藤田健一、柴山由樹、柿沼洋、秋山英二
    • Organizer
      第32回日本MRS年次大会
    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2025-01-30  

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