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GRAIN BOUNDARY ENGINEERING FOR INTERGRANULAR CORROSION RESISTANT MATERIALS BY HOMOGENEOUS DISTRIBUTION OF CSL SEGMENTS IN THE GRAIN BOUNDARY NETWORK

Research Project

Project/Area Number 15360379
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

KOKAWA Hiroyuki  TOHOKU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (10133050)

Co-Investigator(Kenkyū-buntansha) WANG Zhan Jie  TOHOKU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, ASSOCIATE PROFESSOR, 大学院・工学研究科, 助教授 (20323074)
SATO Yutaka  TOHOKU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, RESEARCH ASSOCIATE, 大学院・工学研究科, 助手 (00292243)
ISHIBASHI Ryou  HITACHI, LTD., RESEARCHER, 日立研究所, 研究員
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥15,500,000 (Direct Cost: ¥15,500,000)
Fiscal Year 2004: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2003: ¥11,700,000 (Direct Cost: ¥11,700,000)
Keywordsgrain boundary engineering / stress corrosion cracking / stainless steel / sensitization / intergranular corrosion / weld decay / grain boundary control / coincidence-site-lattice boundary / 粒界構造 / 粒界腐食 / オーステナイト / クロム炭化物 / クロム欠乏 / 加工熱処理
Research Abstract

The concept of ‘grain boundary design and control' has been developed as grain boundary engineering (GBE). GBEed materials are characterized by high frequencies of coincidence site lattice (CSL) boundaries which are resistant to intergranular deterioration of materials, such as intergranular corrosion, because CSL boundaries are low in grain boundary energy. The authors have demonstrated that a suitable thermomechanical treatment remarkably improves the intergranular corrosion resistance of type 304 austenitic stainless steel by GBE. The thermomechanical treatment increased the frequency of CSL boundaries and effectively disrupted the continuous network of random grain boundaries in the material. The homogeneous distribution of CSL segments in the grain boundary network suppresses intergranular degradations. It was also demonstrated that the thermomechanical treatment was also applicable to type 316 austenitic stainless steel and that the GBEed 316 steel showed more than four times higher resistance to intergranular corrosion than that of the 316 base steel during ferric sulfate-sulfuric acid test. The GBE drastically improved the resistance of 304 steel to stress corrosion cracking (SCC), because the base 304 steel test fractured in typical intergranular SCC mode but the GBEed 304 steel showed a small SCC in transgranular mode during an SCC test simulating the environment in a boiling water nuclear reactor. The GBEed 304 steel was also much less corrosive in transpassive environment during Coriou test. The weld decay in 304 steel was significantly suppressed by GBE. The electrochemical potentiokinetic reactivation (EPR) and ferric sulfate-sulfuric acid tests indicated quantitatively the prevention of sensitization in the weld heat affected zone. The present research project has revealed that GBE improves the resistance to intergranular corrosion phenomena extremely in austenitic stainless steels.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (19 results)

All 2005 2004 2003 Other

All Journal Article (14 results) Publications (5 results)

  • [Journal Article] Weld Decay-Resistant Austenitic Stainless Steel by Grain Boundary Engineering2005

    • Author(s)
      Hiroyuki Kokawa
    • Journal Title

      Journal of Materials Science 40・4

      Pages: 927-932

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Weld Decay-Resistant Austenitic Stainless Steel by Grain Boundary Engineering2005

    • Author(s)
      Hiroyuki Kokawa
    • Journal Title

      Journal of Materials Science 40-4

      Pages: 927-932

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Weld Decay-Resistant Austenitic Stainless Steel by Grain Boundary Engineering2005

    • Author(s)
      Hiroyuki Kokawa
    • Journal Title

      Journal of Materials Science 40(印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Grain Boundary Engineering for Intergranular Corrosion Resistant Austenitic Stainless Steel2004

    • Author(s)
      Hiroyuki Kokawa
    • Journal Title

      Key Engineering Materials 261-263

      Pages: 1005-1010

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Optimization of GBCD by Combining Laser Surface Melting with Annealing Heat Treatment2004

    • Author(s)
      Sen Yang
    • Journal Title

      Proceedings of SPIE, 5th International Symposium on Laser Precision Microfabrication, The International Society of Optical Engineering 5662

      Pages: 349-354

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Suppression of weld decay of austenitic stainless steel by grain boundary engineering2004

    • Author(s)
      Hiroyuki Kokawa
    • Journal Title

      Proceedings of Finnish-German-Japanese Seminar on Mechanical and Metallurgical Approaches to New Joining Process

      Pages: 196-203

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Grain Boundary Engineering for Intergranular Corrosion Resistant Austenitic Stainless Steel2004

    • Author(s)
      Hiroyuki Kokawa
    • Journal Title

      Key Engineering Materials 261

      Pages: 1005-1010

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Optimization of GBCD by Combining Laser Surface Melting with Annealing Heat Treatment2004

    • Author(s)
      Sen Yang
    • Journal Title

      Proceedings of SPIE,5th International Symposium on Laser Precision Microfabrication, The International Society of Optical Engineering 5662

      Pages: 349-354

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effect of Twin-induced Grain Boundary Engineering on Intergranular Corrosion in Austenitic Stainless Steel2003

    • Author(s)
      Masayuki Shimada
    • Journal Title

      Proceedings of the 6th International Conference on Trends in Welding Research(Georgia, USA, Ed.)(by S.A.David, et al.)ASM International

      Pages: 93-98

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Suppression of chromium depletion by grain boundary structural change during twin-induced grain boundary engineering of 304 stainless steel2003

    • Author(s)
      Hong Yun Bi
    • Journal Title

      Scripta Materialia 49・3

      Pages: 219-223

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electron microscopic observation of grain boundary in thermomechanical-processed SUS 304 stainless steel2003

    • Author(s)
      Hong Yun Bi
    • Journal Title

      Materials Letters 57・19

      Pages: 2803-2806

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of Twin-induced Grain Boundary Engineering on Intergranular Corrosion in Austenitic Stainless Steel2003

    • Author(s)
      Masayuki Shimada
    • Journal Title

      Proceedings of 6th International Conference on Trends in Welding Research, Georgia, USA(Ed.by S.A.David, et al.)(ASM International)

      Pages: 93-98

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Suppression of chromium depletion by grain boundary structural change during twin-induced grain boundary engineering of 304 stainless steel2003

    • Author(s)
      Hong Yun Bi
    • Journal Title

      Scripta Materialia 49-3

      Pages: 219-223

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electron microscopic observation of grain boundary in thermomechanical-processed SUS 304 stainless steel2003

    • Author(s)
      Hong Yun Bi
    • Journal Title

      Materials Letters 57-19

      Pages: 2803-2806

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Masayuki Shimada: "Effect of Twin-induced Grain Boundary Engineering on Intergranular Corrosion in Austenitic Stainless Steel"Proc.6th International Conference on Trends in Welding Research, Georgia, USA, Ed.by S.A.David, et al.,ASM International. 93-98 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hong Yun Bi: "Suppression of chromium depletion by grain boundary structural change during twin-induced grain boundary engineering of 304 stainless steel"Scripta Materialia. 49・3. 219-223 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hong Yun Bi: "Electron microscopic observation of grain boundary in thermomechanical-processed SUS 304 stainless steel"Materials Letters. 57・19. 2803-2806 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hiroyuki Kokawa: "Grain Boundary Engineering for Intergranular Corrosion Resistant Austenitic Stainless Steel"Key Engineering Materials. 261. 1005-1010 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hiroyuki Kokawa: "Weld Decay-Resistant Austenitic Stainless Steel by Grain Boundary Engineering"Interface Science. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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