Solubility product of Tin in austenite

Ken Inoue, Ikuo Ohnuma, Hiroshi Ohtaimi, Kiyohito Ishida, Taiji Nishizawa

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)


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 1 623 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)γ=4.35-14890/T, log(mass%Ti)(mass%N)α(δ)=4.65-16310/T and log (mass%Ti) (mass%N)liq=4.46-13500/T respectively.

Original languageEnglish
Pages (from-to)991-997
Number of pages7
JournalIsij International
Issue number9
Publication statusPublished - 1998
Externally publishedYes


  • Diffusion couple technique
  • Microalloyed steels
  • Solubility
  • Thermodynamic analysis
  • Titanium nitride

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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