The kinetics of the nitrogen reaction with liquid iron-chromium alloys

Kinetic Study on Surface Dissolution of Nitrogen on Liquid Steel by Isotope Exchange Technique

“…9 along with the results measured by Glaws and Fruehan,18) Tsukihashi and Fruehan, 20) Ono et al, 33) and Morita et al 30) when the content of each additive elements is less than 1 mass% (Here, Cr 33) and V are exceptions.). The rate constant of nitrogen dissolution on the liquid steel is demonstrated as a relative value, k 0 pure iron where indicates the one for pure iron.…”

“…13,14) Previous experimental results from the isotope exchange technique indicated that nitrogen dissolution was a first order reaction 15) in terms of nitrogen partial pressure and that its rates strongly depended on surface active elements such as oxygen and sulfur. 11,13,16) Glaws and Fruehan [17][18][19] reported the effects of S, Cr and Ni on the rate of nitrogen dissolution reaction on the surface of liquid iron alloys, and Tsukihashi and Fruehan,20) using a carbon-saturated liquid iron specimen, found the effect of some alloying elements (P, Pb, Bi, Te, and S) on the rate of the nitrogen dissolution reaction.…”

Surface tension of liquid Fe-Cr-O alloys at 1823 K

“…[4]. [4] where the values used of density of pure liquid iron (7.10 g/cm 3 ) and the concentration dependence (Ϫ0.0033) were those obtained, respectively, by Jimbo and Cramb [34] at 1823 K and Mittag and Lange [19] at 1883 K, assuming that the concentration dependence would not be changed very much by the difference in temperature of 60 K. Cr 2 O 3 is formed by Reaction [5] if chromium content is higher than 2.1 wt pct in the Fe-Cr-O system. [35] [5] [6] The activities of chromium and oxygen were calculated from consideration of the activity coefficients of chromium (f Cr ) and oxygen (f O ).…”

“…For example, the nitrogen absorption (or desorption) [1][2][3][4][5][6][7][8][9][10][11][12] kinetics is related to the surface tension of liquid steels. When the interfacial chemical reaction in nitrogen absorption is the rate-determining step, surface-active elements occupy the reaction sites, so that the reaction only (or preferentially) occurs on the vacant sites.…”

A Kinetic Study on Carburization of Fe by Using 13CO Isotope Gas

“…However, due to the isotope exchange technique, the interfacial reaction can be separated from the overall reaction since the isotope exchange reaction is not affected by liquid phase mass transfer. Recently, several investigators have used the isotope gases to clarify the reaction mechanisms of nitrogen dissolution into iron 13,14) and into Fe-Cr alloys, 15) and CO2 reaction with iron 16) was investigated from a viewpoint of decarburization.…”