溶融 Fe-Cr および Fe-Cr-Ni 合金の窒素吸収速度

概要

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The rates of nitrogen absorption of inductively melted liquid Fe-Cr and Fe-Cr-Ni alloys have been measured at 1600℃ by Sieverts method. The apparent mass transfer coefficient of nitrogen absorption of those alloys, K_N, decreases with increasing oxygen concentration as already observed for liquid iron. In the range between 0.01 and 0.03% O__-, it has been observed that the values of k_N of those liquid alloys are smaller than those of liquid iron, although there are little differences between them below 0.01% O or above 0.03% O. The surface tensions of liquid Fe-Cr and Fe-Cr-Ni alloys were estimated from the experimental results of nitrogen absorption of those alloys, in order to ascertain the behavior of adsorbed oxygen at the gasmetal interface. According to the obtained surface tension for those liquid alloys, it is probable that the excess quantities of adsorbed oxygen at the gas-metal interface of liquid alloys may be higher than those of liquid iron in low oxygen level. On the contrary, in high oxygen level, they may be lower than those of liquid iron. Consequently, the values of k_N may change with the behavior of adsorbed oxygen at the interface. The differences of the apparent mass transfer coefficient among Fe-18Cr, Fe-18Cr-8Ni and Fe-25Cr-20Ni alloys are negligibly small. Silicon, vanadium and manganese have little effect on the values of k_N for liquid Fe-18Cr-8Ni alloy.
社団法人日本鉄鋼協会の論文
1976-03-01