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Thermodynamic analysis of the NaCl type of complex carbonitrides

Research Project

Project/Area Number 02402047
Research Category

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

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

NISHIZAWA Taiji  Tohoku Univ.Fac.Eng.Professor, 工学部, 教授 (60005212)

Co-Investigator(Kenkyū-buntansha) OHTANI Hiroshi  Tohoku Univ.Fac.Eng., 工学部, 助手 (70176923)
石田 清仁  東北大学, 工学部, 助教授 (20151368)
貝沼 亮介  東北大学, 工学部, 助手 (20202004)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥20,800,000 (Direct Cost: ¥20,800,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1990: ¥16,700,000 (Direct Cost: ¥16,700,000)
KeywordsNaCl Carbide / NaCl Nitride / Complex Carbonitrides / Phase Separation / Phase Diagrams / Austenite / Microalloyed Steels / Phase Equilibria / オ-ステナイト / 二相分離
Research Abstract

The purpose of the present research is to analyze the phase equilibria between the carbonitrides in microalloyed steels and to develop a method to calculate the complicated phase relationship. 1.Miscibility gaps in some transition-metal carbide or carbonitride systems have been experimentally studied. The systems investigated were (V,Nb)C, (Ti,V,Nb)C, (V,Nb)C, (V,Nb)(C,N), (Ti,Nb)(C,N)and(Ti,V)(C,N),and the equilibrium compositions were determined by the X-ray measurements and EDX analysis. A thermodynamic calculation of the miscibility gaps was performed on the basis of the experimental results. The Gibbs energy of the carbonitrides has been described using a sublattice model and the interaction energies in the pseudobinary systems were estimated from the difference in lattice constants in components. The miscibility gaps in the 20 (X,Y,Z)C types of carbides,10 (X,Y,Z)N types of nitrides and 10 (X,Y)(C,N) types of carbonitrides were calculated. 2.A thermodynamic model was presented to calculate the composition of austenite as well as that of complex carbonitrides in the microalloyed steels containing Ti,V and Nb. The thermodynamic model was applied to the phase equilibrium calculation between the austenite and (Ti,V,Nb)X, (M1,M2)(C,N),or(Ti,V,Nb)(C,N) type of compounds. Some variations of precipitation mode were observed through the calculation according to the alloy contents and kinds of additional elements. The effect of individual element was briefly summarized as follow;(a) Ti addition to the microalloyed steels enhances the formation of Ti-rich nitrides mainly due to its extreme low solubility in austenite. (b)Complex addition of the elements brings the phase separation of the carbonitrides,and in almost cases the separation between NbC and VC or NbC and TiN is presented. This phenomena can be explained from the view points of the relative stability of binary compounds.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] H.Ohtani: "Micsibility Gap in Transition-metal Carbonitride Systems" Metall.Trans.A.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Calculation of Phase Equilibria between Austenite and Complex Carbonitrides in Microalloyed Steels." Metall.Trans.A.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Calculation of V-C-N and Ti-C-N Phase Diagrams" CALPHAD. 17. 93-100 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Thermodynamic Assessment of the Fe-N-Ti System." CALPHAD. 15. 45-56 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Thermodynamic Assessment of the Fe-N-V System." CALPHAD. 15. 29-44 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Thermodynamic Databases for Alloy Phase Duagrams." Trans.MRS Japan. 19. 199-204 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Miscibility Gap in Transition-metal Carbonitride Systems" Metall.Trans.A.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Calculation of Phase Equilibria between Austenite and Complex Carbonitrides in Microalloyed Steels." Metall.Trans.A.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Calculation of V-C-N and Ti-C-N Phase Diagrams." CALPHAD. 17. 93 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Thermodynamic Assessment of the Fe-N-Ti System." CALPHAD. 15. 45 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Thermodynamic Assessment of the Fe-N-V System.: CALPHAD. 15. 29 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Thermodynamic Databases for Alloy Phase Diagrams." Trans.MRS Japan. 19. 199 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Ohtani: "Miscibility Gap in Transition-metal Carbonitride System." J.Alloys and Compounds.

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Ohtani: "Calculation of Phase Equilibria between Austenite and Complex Carbonitrides in Microalloyed Steels." Metall.Trans.A,.

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Ohtani: "Calculation of Phase Equilibria Between Austenite and Carbonitrides" Metallurgical Transaction A.

    • Related Report
      1991 Annual Research Report
  • [Publications] H.Ohtani: "Miscibility Gaps in NaClーType Carbonitrides" J.LessーCommon Metals.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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