溶融Fe-Ta合金の窒素溶解度ならびにTa窒化物生成平衡

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タイトル別名
  • Solubility of Nitrogen and Equilibrium of Ta-nitride Forming Reaction in Liquid Fe-Ta Alloys
  • 溶融Fe-Ti合金の窒素溶解度ならびにTi窒化物生成平衡
  • ヨウユウ Fe Ti ゴウキン ノ チッソ ヨウカイド ナラビニ Ti チッカ
  • ヨウユウ Fe-Ta ゴウキン ノ チッソ ヨウカイド ナラビニ Ta チッカブツ セイセイ ヘイコウ
  • Solubility of Nitrogen and Equilibrium Of Ti-nitride Forming Reaction in Liquid Fe-Ti Alloys

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説明

The Solubility of nitrogen and the equilibrium of the Ta-nitride forming reaction in liquid Fe-Ta alloys under the presence and absence of Ta-nitride were studied by the sampling method at 1600, 1650 and 1700°C in the concentration range up to 25% Ta. Some thermodynamic interpretations of the atomic interactions in the liquid Fe-Ta-N system were also studied. The results obtained are summarized as follows.<BR>1) Tantalum decreased the activity of nitrogen in liquid iron and the interaction coefficient of tantalum could be expressed as the following quadratic function of tantalum concentration:<BR>2) When an improved model of statistical thermodynamics, which may be applicable for actual solution involving short range order was applied to the results, the theoretical values could be estimated to be in good agreement with the experimental values.<BR>3) In ternary iron alloy systems where the alloying constituents were transition elements j, a definite correlation was found between eO(j) and eN(j) asfollows.<BR>eO(j)times;102=0.278[eN(j)]2×104+0.994<BR>4) The tantalum nitride which appeared in the liquid Fe-Ta-N system was identified as hexagonal TaN (η) by Debye-Scherrer X-ray diffraction analysis. The standard free energy of decomposition was determined as<BR>TaN(s)=Ta+ N<BR>ΔG=70500-35.7T±260(cal)<BR>5) The values of γX(0) in liquid Fe-X binary system were derived by thermodynamic calculation and found a tendency to being more negative for the smaller atomic number elements in IV-a and V-a groups.<BR>6) It was found that there was a correlation between the bonding characteristics of nitrogen with V-a group elements in liquid iron and those in austenite

収録刊行物

  • 鉄と鋼

    鉄と鋼 59 (2), 214-221, 1973

    一般社団法人 日本鉄鋼協会

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