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Creep-Embrittlement and Creep-Cracking in Heat Affected Zone of Cr-Mo Steel

Research Project

Project/Area Number 63420048
Research Category

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

Allocation TypeSingle-year Grants
Research Field 溶接工学
Research InstitutionMie University

Principal Investigator

TAMAKI Koreaki  Mie University, Faculty of Engineering, Professor, 工学部, 教授 (30023047)

Co-Investigator(Kenkyū-buntansha) SUZUKI Jippei  Mie University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (90111872)
KOJIMA Masatoshi  Mie University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (90023275)
KATO Seizo  Mie University, Faculty of Engineering, Professor, 工学部, 教授 (30023229)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥18,900,000 (Direct Cost: ¥18,900,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 1988: ¥11,800,000 (Direct Cost: ¥11,800,000)
KeywordsCr-Mo steel / Heat-affected-zone(HAZ) / HAZ-creep-embrittlement / HAZ-creep-cracking / Simulation system / Transition temperature / Grain-boundary-cracking / Prior-austenite grain boundary / シャルピ-衝撃試験 / クリ-プ割れ / クリ-プ脆化 / 専用クリ-プ試験機 / りんの粒界偏析 / 粒界の脆弱化 / Cr-Mo鋼 / 溶接熱影響部 / クリープ脆化 / クリープ割れ / 溶接熱サイクル再現装置 / 専用クリープ試験機 / 結晶粒界型破面
Research Abstract

Creep-embrittlement and creep-cracking have recently been inspected in certain welded constructions, such as boilers and reactors. They occur in the grain-coarsened-zone (GCZ) of heat-affected-zone (HAZ) when it is reheated in the temperature range of 500 to 600^OC. 11/Cr-1/Mo heat-resisting steel is very susceptible to them. These investigators have constructed an experimental system for simulating those phenomena ; it was composed of (1) a simulator of weld-thermal-cycle, (2) creep-loading test machines and (3) a Charpy-impact-test machine. The main results obtainedby using this experimental system are summarized as follows.
1. Nature of HAZ-creep-cracking : HAZ-creep-cracking can be defined as "the cracking which occurs along the prior-austenite grain boundary in GCZ, with a very small quantity of deformation at the time when the HAZ is reheated". This cracking occurs in an earlier time-period with an increasing stress and a raising temperature.
2. Nature of HAZ-creep-embrittlement : HAZ-creep-embrittlement can be defined as "the phenomenon of raising the transition temperature of GCZ after a prolonged reheating, such as 2000hr at 550^OC". This embrittlement occurs in an earlier time-period with an raising temperature.
3. Mechanism of causing these phenomena : HAZ-creep-cracking is produced by the following process. (1) Impurity elements segregate in the grain boundary of austenite during welding process, (2) their concentrations are enhanced by reheating process, (3) voids are produced in the grain boundary whereimpurity elements segregate. (4) stress connects the voids to form cracking.
The origin of brittle fracture in HAZ-creep-ement will be voids or micro-cracks which are formed by the processes of (1) to (4).

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report

Research Products

(28 results)

All Other

All Publications (28 results)

  • [Publications] 玉置 維昭,鈴木 実平他: "StressーInduced PhosphorusーSegregation and Intergranular Cracking in Welded Zone of 1Crー1/2Mo Steel" Research Reports,Faculty of Engineering,Mie University. 14. 9-22 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 玉置 維昭,鈴木 実平: "Influence of Sulfur and Phosphorus on Reheat craking Sensitivity of 1Crー1/2Mo Steel" Proc.of Infternational Symposium of Japan Welding Society,Tokyo. 5ーII. 751-756 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 玉置 維昭,鈴木 実平,小嶋 昌俊: "Influence of Alloyingーand Impurity Elements on Reheat Cracking Sensitivity of Steels" Preprint of International Seminar “Hot Cracks in Welded Joints of steel"s,Kiev,ussr. 1-15 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 玉置 維昭,鈴木 実平他: "System for Simulating the EmbriHlement Induced by Creep in Steel Weld" Reseach Reports,Faculty of Endineering,Mie University. 15. 1-8 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 玉置 維昭,鈴木 実平他: "CrーMo鋼における低延性クリ-プ割れと再熱割れの関連について" 溶接学会論文集.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 玉置 維昭,鈴木 実平他: "CrーMo鋼における低延性クリ-プ割れとクリ-プ脆化の関連について" 溶接学会論文集.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. TAMAKI, J. SUZUKI et al.: "Stress-Induced Phosphorus Segregation and Intergranular Cracking in Welded Zone of 1Cr-1/Mo Steel." Research Reports, Faculty of Engineering, Mie University. 14. 9-22 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. TAMAKI, J. SUZUKI: "Influence of Sulfur and Phosphorus on Reheat Cracking Sensitivity of 1Cr-1/Mo Steel." Proc., International Sympo., Japan Welding Society. 5-II. 751-756 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. TAMAKI, J. SUZUKI, M. KOJIMA: "Influence of Alloying- and Impurity Elements on Reheat Cracking Sensitivity of Steels." Preprint, Int. Seminar, "Hot Cracks in Welded Joints" (Kiev, USSR). 1-15 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. TAMAKI, J. SUZUKI et al.: "System for Simulating the Embrittlement Induced by Creep in steel Weld." Research Reports, Faculty of Engineering, Mie University. 15. 1-8 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. TAMAKI, J. SUZUKI et al.: "HAZ Creep-Cracking in Cr-Mo Steel and Its Similarity to Reheat Cracking." Quarterly Journal, Japan Welding Society.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. TAMAKI, J. SUZUKI et al.: "Generating Mechanism of HAZ Creep-Embrittlememt in Cr-Mo Steel comparing with that of HAZ Creep-Cracking." Quarterly Journal, Japan Welding Society.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 玉置 維昭,鈴木 実平,他: "StressーInduced PhosphorusーSegregation and Intergranular Cracking in Welded Zone of 1Crー1/2Mo Steel" Research Reports,Faculty of Engineering,Mie University. 14. 9-22 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 玉置 維昭,鈴木 実平: "Influence of Sulfur and Phosphorus on Reheat Cracking Sensitivity of 1Crー1/2Mo Steel" Proc.of International Symposium of Japan Welding Society,Tokyo. 5ーII. 751-756 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 玉置 維昭,鈴木 実平,小嶋 昌俊: "Influence of Alloyingーand Impurity Elements on Reheat Cracking Sensitivity of Steels" Preprint of International Seminar“Hot Cracks in Welded Joints of Steels",Kiev,USSR. 1-15 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 玉置 維昭,鈴木 実平,他: "System for Simulating the Embrittlement Induced by Creep in Steel Weld" Research Reports,Faculty of Engineering,Mie University. 15. 1-8 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 玉置 維昭,鈴木 実平,他: "CrーMo鋼における低延性クリ-プ割れと再熱割れの関連について" 溶接学会論文集.

    • Related Report
      1990 Annual Research Report
  • [Publications] 玉置 維昭,鈴木 実平,他: "CrーMo鋼における低延性クリ-プ割れとクリ-プ脆化の関連について" 溶接学会論文集.

    • Related Report
      1990 Annual Research Report
  • [Publications] 玉置維昭: "1Crー0.5Mo鋼溶接部におけるりんの偏析および粒界割れにおよぼす応力の影響" 溶接学会溶接冶金研究委員会資料. 117. 1-14 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 玉置維昭: "Stress-Induced Phosphorus-Segregation and Intergranular Cracking in Welded Zone of 1Cr-1/2Mo Steel" Research Reports of the Faculty of Engineering,Mie University. 14. 9-22 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 玉置維昭: "Influence of Sulfur and Phosphorus on Reheat Cracking Sensitivity of 1Crー1/2Mo Steel" proceedings of 5th International Symposium of Japan welding Society. IV. 1-6 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 玉置維昭: "1Crー1/2Mo鋼の再熱割れにおよぼすいおうとマンガンの相互作用" 溶接学会論文集. 8. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 玉置維昭: "Process of Phosphorus Segregation during Rapid Heating of Fe-P-C Alloy" Transactions of Japan Welding Society. 21. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 玉置維昭: "A System Simulating the Creep Embrittlement in Steel Weldment" Research Reports of the Faculty of Engineering,Mie University. 15. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 玉置維昭: Research Reports of the Faculty of Engineering,Mie University. 13. 21-30 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 玉置維昭: Trans.Japan Welding Society. 19. 46-52 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 玉置維昭: Research Reports of the Faculty of Engineering,Mie University. 14. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 玉置維昭: 溶接学会溶接冶金研究委員会資料. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-03-31   Modified: 2016-04-21  

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