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2004 Fiscal Year Final Research Report Summary

Integration of the system free energy concept and the Phase-field method for the risk-based materials design

Research Project

Project/Area Number 14350368
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionNagoya University

Principal Investigator

MURATA Yoshinori  Nagoya University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (10144213)

Co-Investigator(Kenkyū-buntansha) KOYAMA Toshiyuki  Computational Materials Science Center, National Institute for Material s Science, Senior Researcher, 計算材料科学研究センター, 主任研究員 (80225599)
Project Period (FY) 2002 – 2004
Keywordssystem free energy / Phase-field / materials design
Research Abstract

The main purpose of this research is to predict the microstructural evolution of metallic materials showing a complex microstructure on the basis of the integration method of the system free energy concept and the Phase-field method. The system free energy is represented by the chemical free energy, the interfacial energy and the elastic strain energy, and it can predict the stable microstructure of the materials at a given time. On the other hand, the Phase-field method is based on the field variables as a function of the field indicating the state of microstructure, and the microstructural evolution is represented by the time evolution of the varialbles. In this study, high Cr ferritic steels were treated, because they show the most complex microstructure among metallic materials and hence they are suitable for the purpose of this study. For the ferritic steels, the TTP(Time-Temperature-Precipitation) diagram was constructed for Fe-C-Cr-Co-W-Mo system, and the phase boundary between the coherent and incoherent Laves phases was determined for Fe-C-Cr-W system. Also, The phase-field simulation was carried out for the recrystallization of iron. Through these results, it was found that microstructural evolution can be estimated when the change in the system free energy was evaluated quantitatively with a sequence of time. From this point of view, the system free energy was evaluated quantitatively for the martensite structure. As a result, the contribution of the interfacial energies such as grain boundary energy and packet boundary energy were found to be about one tenth of the elastic strain energy in the martensite phase. Furthermore, it was found that about 80% of the elastic strain energy was released by the tempering at 1053K for 1h. In conclusion, the most important thing for the risk based materials design is to evaluate the system free energy change quantitatively and it makes easy for the phase-filed simulation.

  • Research Products

    (12 results)

All 2005 2004 2003

All Journal Article (12 results)

  • [Journal Article] Dependence of Solvus Temperature of the Laves Phase on (Mo+W+Re) Contents in High Cr Ferritic Steels2005

    • Author(s)
      Y.Murata, M.Kamiya, A.M.Abdel-Daiem, T.Koyama, M.Morinaga, R.Hashizume
    • Journal Title

      ISIJ International Vol.45.No.1

      Pages: 101-106

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogen Dissolution into 10% Chromium Ferritic Steels during High-Temperature Steam Oxidation2005

    • Author(s)
      M.Nakai, K.Nagai, Y.Murata, M.Morinaga, S.Matsuda, M.Kanno
    • Journal Title

      Materials Transaction Vol.46,No.1

      Pages: 69-73

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Diffusion of Refractory Elements in N-A1-X (X : Re,W) Ternary Alloys2005

    • Author(s)
      M.Hattori, N.Goto, Y.Murata, T.Koyama, M.Morinaga
    • Journal Title

      Materials Transaction Vol.46,No.2

      Pages: 163-166

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Dependence of Solvus Temperature of the Laves Phase on (Mo+W+Re) Contents in High Cr Ferritic Steels2005

    • Author(s)
      Y.Murata, M.Kamiya, A.M.Abdel-Daiem, T.Koyama, M.Morinaga, R.Hashizume
    • Journal Title

      ISIJ International Vol.45(1)

      Pages: 101-106

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrogen Dissolution into 10% Chromium Ferritic Steels during High-Temperature Steam Oxidation2005

    • Author(s)
      M.Nakai, K.Nagai, Y.Murata, M.Morinaga, S.Matsuda, M.Kanno
    • Journal Title

      Materials Transaction Vol.46(1)

      Pages: 69-73

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Diffusion of Refractory Elements in N-Al-X(X:Re,W) Ternary Alloys2005

    • Author(s)
      M.Hattori, N.Goto, Y.Murata, T.Koyama, M.Morinaga
    • Journal Title

      Materials Transaction Vol.46(2)

      Pages: 163-166

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of Refractory Elements(X : Mo,W,Re) on the Microstructural Evokution of Fe-8Cr-0.1C-X Martensitic Steels during Tempering2004

    • Author(s)
      T.Kunieda, Y.Murata, M.Morinaga, T.Koyama
    • Journal Title

      Materials Transaction Vol.45,No.2

      Pages: 392-395

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Beneficial Effect of Sulfur State on High-Temperature Steam Oxidation Resistance in High Chromium Ferritic Steels2004

    • Author(s)
      M.Nakai, Y.Murata, M.Morinaga, Y.Sasaki
    • Journal Title

      Materials Transaction Vol.45,No.31

      Pages: 865-869

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of Refractory Elements(X:Mo,W,Re) on the Microstructural Evokution of Fe-8Cr-0.1C-X Martensitic Steels during Tempering2004

    • Author(s)
      T.Kunieda, Y.Murata, M.Morinaga, T.Koyama
    • Journal Title

      Materials Transaction Vol.45(2)

      Pages: 392-395

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Beneficial Effect of Sulfur State on High-Temperature Steam Oxidation Resistance in High Chromium Ferritic Steels2004

    • Author(s)
      M.Nakai, Y.Murata, M.Morinaga, Y.Sasaki
    • Journal Title

      Materials Transaction Vol.45(3)

      Pages: 865-869

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of Impurity Sulfur on the Formation of Cr_2O_3 and SiO_2 at the Early Stage of Steam Oxidation in both Ferritic and Sustenitic Steels2003

    • Author(s)
      M.Nakai, Y.Murata, M.Morinaga, R.Hashizume
    • Journal Title

      Materials Transaction Vol.44,No.9

      Pages: 1830-1838

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of Impurity Sulfur on the Formation of Cr_2O_3 and SiO_2 at the Early Stage of Steam Oxidation in both Ferritic and Sustenitic Steels2003

    • Author(s)
      M.Nakai, Y.Murata, M.Morinaga, R.Hashizume
    • Journal Title

      Materials Transaction Vol.44(9)

      Pages: 1830-1838

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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