Solubility Product of TiN in Austenite

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著者

    • INOUE Ken
    • Department of Materials Science, Graduate School of Engineering, Tohoku University
    • OHNUMA Ikuo
    • Department of Materials Science, Graduate School of Engineering, Tohoku University
    • ISHIDA Kiyohito
    • Department of Materials Science, Graduate School of Engineering, Tohoku University

抄録

The solubility product of TiN in an austenitic steel was experimentally determined using a diffusion couple technique. Diffusion couples consisting of Ti–N steels with various compositions were annealed at temperatures between 1 473 and 1623 K, taking special care to exclude the oxygen contamination during the annealing. The solubility limit of TiN was determined from the break points of iso-activity lines for nitrogen. A thermodynamic analysis was also carried out to arrive at solubility products by considering the wide range of temperature dependence of the TiN formation energy. Solubility products in austenite (γ), ferrite (α or δ) and liquid phases were determined as log(mass%Ti)(mass%N)<sub>γ</sub>=4.35–14 890/<I>T</I>, log(mass%Ti)(mass%N)<sub>α(δ)</sub>= 4.65–16310/<I>T</I> and log(mass%Ti)(mass%N)<sub>liq</sub>=4.46–13500/<I>T</I> respectively.

収録刊行物

  • ISIJ international  

    ISIJ international 38(9), 991-997, 1998-09-15 

    The Iron and Steel Institute of Japan

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