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Remaining-Life Prediction of High Cr Ferritic Steel Welded Joint by Rectangular-Type Small Punch Test Specimen

Research Project

Project/Area Number 24360294
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Structural/Functional materials
Research InstitutionKagoshima University

Principal Investigator

KOMAZAKI Shin-ichi  鹿児島大学, 理工学研究科, 教授 (70315646)

Co-Investigator(Kenkyū-buntansha) TOKUNAGA Tatsuya  九州工業大学, 大学院工学研究科, 准教授 (40457453)
GUO Yong-Ming  鹿児島大学, 大学院理工学研究科, 助教 (60262375)
Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2012: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Keywordsスモールパンチ試験 / クリープ / 余寿命評価 / 溶接接手 / 高Crフェライト系耐熱鋼 / デジタル画像相関法 / Type IV破壊 / 微小試験片 / デジタル相関法 / 溶接継手
Outline of Final Research Achievements

The effective method (load-stress conversion equation) for converting the SP creep test results to the uniaxial creep ones could not be unfortunately proposed in this study, because of insufficient number of data and low accuracy of strain measurement. On the other hand, the present study has revealed the possibility that the remaining-life can be directly predicted by the SP creep test results. The creep life fractions at the distances of 0.5 mm and 4 mm from the outer surface were estimated to be 99.99% and 99.52%, respectively, based on the life fraction rule using the SP creep rupture data. These results indicated that almost all the lives had been already consumed at the subsurface of outer surface, and they were in qualitatively good agreement with the observation that some microcracks were initiated there.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • Research Products

    (6 results)

All 2015 2014 2013

All Presentation (6 results)

  • [Presentation] Gr.122鋼溶接継手部のクリープに伴う水素昇温脱離特性の変化2015

    • Author(s)
      山下勇人,駒崎慎一,大島将史
    • Organizer
      日本鉄鋼協会 第169回春季講演大会
    • Place of Presentation
      東京大学(東京都・目黒区駒場)
    • Year and Date
      2015-03-18 – 2015-03-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] 改良SPクリープ試験法によるGr.122鋼溶接継手部のクリープ損傷評価2014

    • Author(s)
      内村 洋,駒崎慎一,山下勇人,楠元淳一,田渕 豊
    • Organizer
      日本材料学会 高温強度シンポジウム
    • Place of Presentation
      ロワジールホテル函館(北海道・函館市)
    • Year and Date
      2014-12-04 – 2014-12-05
    • Related Report
      2014 Annual Research Report
  • [Presentation] 水素昇温脱離分析法によるGr.122鋼溶接継手部のクリープ損傷評価2014

    • Author(s)
      山下勇人,駒崎慎一,大島将史
    • Organizer
      日本材料学会 高温強度シンポジウム
    • Place of Presentation
      ロワジールホテル函館(北海道・函館市)
    • Year and Date
      2014-12-04 – 2014-12-05
    • Related Report
      2014 Annual Research Report
  • [Presentation] 改良SPクリープ試験法による12%Cr耐熱鋼溶接継手のクリープ特性評価2014

    • Author(s)
      内村 洋,山下勇人,駒崎慎一,楠元淳一,田渕 豊
    • Organizer
      日本鉄鋼協会第167回春季講演大会
    • Place of Presentation
      東京工業大学
    • Related Report
      2013 Annual Research Report
  • [Presentation] 改良SPクリープ試験法による12%Cr耐熱鋼溶接継手のクリープ特性評価2013

    • Author(s)
      内村 洋,山下勇人,駒崎慎一,金谷章宏,楠元淳一,田渕 豊
    • Organizer
      日本機械学会九州支部鹿児島講演会
    • Place of Presentation
      鹿児島大学
    • Related Report
      2013 Annual Research Report
  • [Presentation] 改良SPクリープ試験法による12%Cr耐熱鋼溶接継手のクリープ特性評価2013

    • Author(s)
      内村 洋,山下勇人,駒崎慎一,金谷章宏,楠元淳一,田渕 豊
    • Organizer
      日本機械学会M&M2013材料力学カンファレンス
    • Place of Presentation
      岐阜大学
    • Related Report
      2013 Annual Research Report

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Published: 2012-04-24   Modified: 2019-07-29  

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