The Solubility of Nitrogen and the Equilibrium of Nb-Nitride Forming Reaction in Liquid Fe-Nb Alloys

Morita, Zen-ichirô; Hachisuka, Kunio; Iwanaga, Yuji; Adachi, Akira

doi:10.2320/jinstmet1952.35.9_831

Cited by 9 publications

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“…[16][17][18][19][20] The e Nb N values measured at niobium content in liquid iron below 10 mass% show little discrepancy in the range of À0:067$ À 0:068. [18][19][20] The recommended value of the Japan Society for the Promotion of Science (JSPS) for e Nb N is À0:068 at 1873 K and À280=T þ 0:0816 in the temperature range of 1873$1973 K at niobium content below 9.7 mass% in liquid iron.…”

Section: Effect Of Nb On the Solubility Product Of Tin In Liquid Ironmentioning

confidence: 99%

Thermodynamic Interactions of Nb and Mo on Ti in Liquid Iron

et al. 2008

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Thermodynamic interactions of niobium and molybdenum on titanium in liquid iron were studied in the temperature range of 1873$1973 K by measuring the effects of niobium and molybdenum on the solubility product for TiN formation in liquid iron using the metalnitride-gas equilibration technique. The experimental results were thermodynamically analyzed using Wagner's interaction parameter formalism to determine the first-order interaction parameters of niobium and molybdenum on titanium in liquid iron as 0:0495 AE 0:0049 and 0:01 AE 0:0026, respectively, at 1873 K. Temperature dependence of these parameters was also determined as follows.

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Section: Effect Of Nb On the Solubility Product Of Tin In Liquid Ironmentioning

confidence: 99%

Thermodynamic Interactions of Nb and Mo on Ti in Liquid Iron

et al. 2008

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“…5, the values obtained in present study is in good agreement with the values reported by Turnock and Pehlke 2) and Pehlke and Elliott. 1) In this figure the line of Ishii et al 3) and Morita et al, 4) which is recalculated in this study using the first order interaction parameter between chromium and nitrogen, e N Cr (Ϫ0.046) of Fe-Cr binary system reported by Ishii et al 3) and that between niobium and nitrogen, e N Nb (Ϫ0.086) of Fe-Nb binary system reported by Morita et al, 4) is higher than the others determined in the ternary system of Fe-Cr-Nb at the higher content of niobium.…”

Section: Nitrogen Solubility In Fe-cr-nb Alloymentioning

confidence: 73%

Effect of Niobium on Nitrogen Solubility in High Chromium Steel.

et al. 2002

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The interaction parameters of alloying elements on nitrogen in liquid Fe-Cr alloys containing niobium have been determined. The equilibrium nitrogen solubility in the liquid iron alloy was measured by metal-gas equilibrium technique under 0.04 to 1.0 atm of nitrogen atmosphere at 1 823 to 1 923K. Nitrogen solubility in Fe-Cr-Nb melts obeyed Sieverts' law for all compositions studied in present study.The results obtained are summarized as follows;(1) The solubility of nitrogen markedly increased with increasing chromium and niobium. The interaction parameters in liquid iron alloys containing 10-18 % of Cr and 0.2-2 % of Nb are obtained. (2) The solubility of nitrogen was lower at a higher temperature in Fe-Cr melts in this study. (3) Test results indicated that it is not likely to form niobium nitride in Fe-Cr-Nb-N alloys and it was confirmed by EDS.

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“…This niobium concentration was determined as to be slightly higher than the equilibrium niobium concentration to precipitate niobium nitride at 1813K under an atmospheric pressure of nitrogen. The equilibrium concentration of niobium was estimated at 9.8 mass% by extrapolation of the data reported by Morita et al (2). Liquid Fe-Nb alloy was held in the stream of Ar-40%H2 for 3.6-7.2ks for deoxidation, then nitrogen gas of an atmospheric pressure, in place of Ar-40%H2, was introduced over the surface of the melt at 1813 K to form niobium nitride on it.…”

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Direct Determination of the Structure of Niobium Nitride in Equilibrium with Liquid Fe–Nb–N Alloy by High Temperature X-Ray Diffractometry

et al. 1986

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From the viewpoint of fundamental study of steelmaking, the direct determination of the structure and composition of niobium nitride in equilibrium with liquid Fe-Nb-N alloy has been attempted by means of high temperature X-ray diffraction technique. X-ray analysis has also been carried out at room temperature for niobium nitride powder extracted from the solidified alloy ingot.It was found from a high temperature X-ray diffraction pattern that the niobium nitride equilibrating with liquid Fe-(11.5-14.3) mass%Nb-N alloy at 1813 K under an atmospheric pressure of nitrogen 14.3) mass%Nb-N alloy seemed to be morphologically invariant during the cooling and solidification at the rate of 3-5K/s or 0.2-0.5K/s.The lattice parameter of niobium nitride was determined to be 0.4385nm at room temperature, and its composition was estimated to be Nb1 .1N from the relation between the lattice parameter and the ratio N/ Nb. Provided that the composition of niobium nitride does not change in the course of cooling and solidification, the niobium nitride forming reaction in liquid Fe-(11.5-14.3) mass%Nb-N alloy at 1813 K under an atmospheric pressure of nitrogen is expressed as follows:1.1Nb+N=Nb1.1N(s).

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The Solubility of Nitrogen and the Equilibrium of Nb-Nitride Forming Reaction in Liquid Fe-Nb Alloys

Cited by 9 publications

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Thermodynamic Interactions of Nb and Mo on Ti in Liquid Iron

Thermodynamic Interactions of Nb and Mo on Ti in Liquid Iron

Effect of Niobium on Nitrogen Solubility in High Chromium Steel.

Direct Determination of the Structure of Niobium Nitride in Equilibrium with Liquid Fe–Nb–N Alloy by High Temperature X-Ray Diffractometry

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The Solubility of Nitrogen and the Equilibrium of Nb-Nitride Forming Reaction in Liquid Fe-Nb Alloys

Cited by 9 publications

References 0 publications

Thermodynamic Interactions of Nb and Mo on Ti in Liquid Iron

Thermodynamic Interactions of Nb and Mo on Ti in Liquid Iron

Effect of Niobium on Nitrogen Solubility in High Chromium Steel.

Direct Determination of the Structure of Niobium Nitride in Equilibrium with Liquid Fe&ndash;Nb&ndash;N Alloy by High Temperature X-Ray Diffractometry

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Direct Determination of the Structure of Niobium Nitride in Equilibrium with Liquid Fe–Nb–N Alloy by High Temperature X-Ray Diffractometry