滲炭平衡及鐵炭素状態圖に就て

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概要

• 論文の詳細を見る

• An accurate consideration is given on the carburizing of iron by gases which has heretofore been wrongly represented thus : 3Fe+2CO=Fe_3C+CO_2……(1) Since solid cementite is unstable and is decomposed at all temperatures into graphite, the reaction Fe_3C⇾3Fe+C……(2) is complete. Then by adding the equilibrium (3), i. e., 2CO⇌C+CO_2……(3) to (2), we obtain Fe_3C+CO_2⇾3Fe+2CO……(4) which does not permit solid cementite to be produced by the reaction of iron with CO. The carburizing reaction must be represented as follows : - (Solid soln.)+2CO⇌C(Solid soln.)+CO_2 The carbon content in the solid solution rises with the increase in the partial pressure of CO, until it becomes saturated with carbon. The equilibrium taking place over the saturated solid solution CO-existing with carbon is 2CO⇌C+CO_2……(5) These behaviors are shown in Fig.2. Combining Fig. 2 with the Fe-C diagram, in which the solid solubility of oxygen may be neglected, the carburizing equilibria may be understood. From the above considerations, it is possible to determine, by resorting to a method where thin iron plates are carburized and the saturation content of carbon analyzed, the solubility curve of carbon in Austenite, that is, the ES curve in the Fe-C diagram which has already been obtained by thermal analyses. The experimental results are shown in Fig.4. The solubility of carbon in α-iron is so small that below the eutectoid temperature carburizing can scarcely occur and only up to 0.03%C. Consequently, at these temperatures, decarburizing of steel is inevitable in spite of the reducing nature of the atmosphere.

• 社団法人日本鉄鋼協会の論文
• 1938-05-25

著者

• 眞殿 統

  理化學研究所

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• 11) 滲炭平衡及鐵炭素状態圖に就て(日本鐵鋼協會第拾八囘講演大會)

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