Al および N を含む鋼の水素雰囲気中加熱による窒化物窒素と固溶窒素の分別定量の可能性についての検討

概要

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Hydrogen hot extraction for the determination of metallurgically dissolved nitrogen was investigated. Alminium-killed steel with nitride-nitrogen and dissolved nitrogen was heated in hydrogen stream at 500-1000℃, and after the extraction, total nitrogen retained in steel, nitride-nitrogen and nitrogen as NH_3 in hydrogen collected in diluted sulfuric acid were determined. A kinetic consideration shows that the technique is only successful when the rate of dissociation of nitride, k_1 and that of precipitation, k_2 are negligibly smaller than that of formation of NH_3, k_3. In this case (k_1+k_2≪k_3), nitride-nitrogen remains unchanged in steel after hot extraction, while dissolved nitrogen is removed from steel as NH_3. Experimental results of aluminium-killed steel showed that the relation (k_1+k_2≪k_3) was not valid and this technique was unsuccessful. In steel having dissolved nitrogen only, aluminium-nitride precipitated during hot extraction, while dissolving of the nitride and removal of nitrogen were observed in steel with nitride-nitrogen during hot extraction ; this technique did not give the original contents of nitrogen of various states.
社団法人日本鉄鋼協会の論文
1972-07-01