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在本文中,作者首先计算了铁、碳化铁的共晶平衡,得出共晶温度为1148°;这在以前因为缺乏液态铁碳合金内的活度数据是不可能计算的。其次作者综合分析了前人数据,主要根据1148°的介稳共晶温度及723°的介稳共析温度,算出碳化铁的热力学函数。根据这样算出的碳化铁热力学函数及有关热力学数据,作者(i)复核了碳化铁的共析温度及共析点成分;(ii)计算了碳化铁在奥氏体内的溶解度;(iii)计算了碳化铁在铁液内的溶解度及碳化铁液相线与石墨液相线的相交温度。最后,根据本文及稳定平衡部分的计算结果,作者将现行铁碳相图加以修正,俾合于热力学的要求。但关于碳化铁在铁液内溶解度的计算仅属于初步近似性质,有待将来研究。
In this paper, the authors first calculated the eutectic balance of iron and iron carbide, resulting in a eutectic temperature of 1148 °; this was previously impossible to calculate because of a lack of activity data in liquid iron-carbon alloys. Secondly, the author comprehensively analyzed the previous data, and calculated the thermodynamic function of iron carbide based on the metastable eutectic temperature of 1148 ° and the metastable eutectoid temperature of 723 °. Based on the calculated iron carbide thermodynamic functions and related thermodynamic data, the author (i) reviews the eutectoid temperature and eutectoid composition of the iron carbide; (ii) calculates the solubility of the iron carbide in austenite; (iii) calculates The solubility of iron carbide in molten iron and the intersection temperature of the carburized iron liquidus and graphite liquidus were studied. Finally, based on the results of this paper and the calculation of stable equilibrium, the author revised the current iron-carbon phase diagram so as to meet the requirements of thermodynamics. However, the calculation of the solubility of iron carbide in molten iron is only a preliminary approximation, which is to be studied in the future.