Effect of Niobium on Nitorogen Solubility in High Chromium steel

概要

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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 interactionparameters 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.
社団法人日本鉄鋼協会の論文
2002-06-15