• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development of Nondestructive Assessment Methodology for Residual Life of Martensitic Heat Resistant Steel

Research Project

Project/Area Number 10555225
Research Category

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

Allocation TypeSingle-year Grants
Section展開研究
Research Field Structural/Functional materials
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

MARUYAMA Kouichi  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90108465)

Co-Investigator(Kenkyū-buntansha) NONAKA Osamu  IHI Co., Ltd., Research Institute, Section Chief, 技術研究所・材料研究部・材料評価グループ, 材料評価グループ課長(研究職)
KOIKE Jun-ichi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10261588)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥12,500,000 (Direct Cost: ¥12,500,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1998: ¥7,600,000 (Direct Cost: ¥7,600,000)
KeywordsStructure Materials for High Temperature Use / High Cr Heat Resistant Steel / High Temperature Creep / Martensitic Lath Structure / Recovery of Lath Structure / Nondestructive Residual Life Evaluation / Hardness
Research Abstract

High Cr ferritic heat resistant steel is widely applied to the thick section components of power plants to be used in creep regime. In this research, nondestructive residual life assessment of such high Cr steel with tempered martensitic lath structure was examined, and the results are summarized as follows :
1.There are four factors that may control creep deformation and fracture of the high Cr ferritic heat resistant steels. They are dislocation(lath)structure, precipitates on grain- and sub-boundaries, fine particles within subgrains, and solute atoms such as W and Mo.Among these factors, the lath structure in the most important obstacle that determines yield stress of the steel. Its recovery is closely related to the progress of creep deformation and the subsequent failure. Therefore, this recovery of lath structure should be taken as the measure of life assessment.
2.As a result of the recovery of martensitic lath structure, lath width increases with increasing creep strain. The relative increase in lath width Δλ/Δλ^* is linearly related to creep strain. Δλ is the change in lath width from the original value, and Δλ^* is the value of Δλ at rupture. The coefficient of linear relation does not change with creep condition or alloy composition.
3.Based on the linear relation between lath width and creep strain, we can evaluate creep strain of a component of engineering plants. Creep curve under any creep condition can readily predict with the aid of creep database. Residual life can be assessed from the estimated creep strain and the creep curve predicated.
4.The residual life assessment based on the measurement of lath width is applicable to rotor steel tempered at low temperature. However, in boiler steel(such as HCM12A)tempered at higher temperature, brittle fracture takes place by the coalescence of grain boundary cavities. Life assessment based on cavity growth should be employed in this case.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] 澤田浩太: "改良9Cr-1Mo鋼のマルテンサイト組織変化によるクリープ余寿命評価"鉄と鋼. 84・8. 580-585 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Dislocation Substructure Degradation during Creep of Martensitic Heat-resisting Steels with and without W"Materials for Advanced Power Engineering 1998. 575-583 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Effect of W on Recovery of Lath Structure during Creep of High Martensitic Steels"Materials Science and Engineering, A. 267. 19-25 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Creep life Assessment of high Chromium Ferritic Steels by Recovery of Martensitic Lath Structure"Key Engineering Materials. 171・174. 109-114 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 佐藤誠: "W含有高Crフェライト系耐熱鋼のクリープ挙動とサブグレイン組織安定性の相関"日本金属学会誌. 64・5. 371-374 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Maruyama: "Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel"ISIJ International. 41・6(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 丸山公一: "金属便覧(5.4.2クリープ変形,5.4.3クリープ破壊)"丸善. 348-358 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Residual Creep Life Assessment by Change of Martensitic Lath Structural in Modified 9Cr-1Mo Steels"Journal of Iron & Steel Inst.Japan. vol.84, No.8. 580-585 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Dislocation Substructure Degradation during Creep of Martensitic Heat-resisting Steels with and without W"Materials for Advanced Power Engineering 1998. vol.1. 575-583 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Effect of W on Recovery of Lath Structure during Creep of High Chromium Martensitic Steels"Materials Science and Engineering. vol.A267. 19-25 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Creep life Assessment of high Chromium Ferritic Steels by Recovery of Martensitic Lath Structure"Key Engineering Materials. vol.171-174. 109-114 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Sato: "Correlation between Creep Strength and Stability of Subgrain Structure in High Chromium Heat Resistant Steel with Tungsten"Journal of Japan Institute of Metals. vol.64, No.5. 371-374 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Maruyama: "Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel"ISIJ International. vol.41, No.6(In press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Maruyama: "Metallurgical Hnndbook : 5.4.2 Creep Deformation, 5.4.3 Creep Fracture"Maruzen. 348-358 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sawada: "Creep life Assessment of high Chromium Ferritic by Recovery of Martensitic Lath Structure"Key Engineering Materials. 171・174. 19-25 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 九島秀昭: "1Cr-0.5Mo鋼のクリープ挙動と長時間クリープ強度に及ぼす組織変化の影響"鉄と鋼. 86・2. 131-137 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 佐藤誠: "W含有高Crフェライト系耐熱鋼のクリープ挙動とサブグレイン組織安定性の相関"日本金属学会誌. 64・5. 371-374 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 関口貴子: "熱サイクルによるSi基板上銅薄膜の塑性変形とキャビティ形成"日本金属学会誌. 64・5. 379-382 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] J.Koike: "Stress-induced Phase Transformation during Superplastic Deformation in Two-phase Ti-Al-Fe alloy"Acta Materialia. 48・9. 2059-2069 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Maruyama: "Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel"ISIJ International. 41・6(印刷中). (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 丸山公一: "金属便覧(5.4.2クリープ変形,5.4.3クリープ破壊)"丸善. 348-358 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Sawada: "Effect of W on Recovery of Lath Structure during Creep of High Martensitic Steels"Materials Science and Engineering, A. 267. 19-25 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 丸山公一: "鉄鋼材料の高温強度"ふぇらむ. 4・9. 611-616 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 九島秀昭: "2.25Cr-1Mo鋼の長時間クリープ特性に及ぼす初期組織の影響"鉄と鋼. 85・11. 848-855 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Sawada: "Creep life Assessment of high Chromium Ferritic by Recovery of Martensitic Lath Structure"Key Engineering Materials. 171-174. 109-114 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 九島秀昭: "1Cr-0.5Mo鋼のクリープ挙動と長時間クリープ強度に及ぼす組織変化の影響"鉄と鋼. 86(印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 佐藤誠: "W含有高Crフェライト系耐熱鋼のクリープ挙動とサブグレイン組織安定性の相関"日本金属学会誌. 64(印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 九島秀昭: "2.25Cr-IMo鋼の長時間クリープ変形特性に及ぼすミクロ組織の影響" 日本学術振興会第123委員会報告. 39・2. 61-72 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 澤田浩太: "高Crフェライト系耐熱鋼の転位下部組織とクリープ損傷評価" 日本学術振興会第123委員会報. 39・2. 93-100 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 澤田浩太: "改良9Cr-IMo鋼のマルテンサイト組織変化によるクリープ余寿命評価" 鉄と鋼. 84・8. 580-585 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Sawada: "Dislocation Substructure Degradation during Creep of Martensitic Heat-resisting Steels with and without W" Materials for Advanced Power Engineering1998. 575-583 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] J.Koike: "Effects of the liquid phase on the high-temperature tensile ductility:from embrittlement to superplasticity" Philosophical Magazine,A. 78・3. 599-614 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Sawada: "Effect of W on Recovery of Lath Structure during Creep of High Chromium Martensitic Steels" Materials Science & Engineering,A. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi