滲炭平衡に就て

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The following equations of the carburizing equilibrium have been confirmed by many investigators. 3Fe+2CO⇌Fe_3C+CO_2 [Fe-C-O System] 3Fe+CH_4⇌Fe_3C+2H_2 [Fe-C-H System] Lately Mr. Madono presented the opinion in which be asserted the carburizing equation should be represented as follows : (Solid Sol.)+2CO⇌(Solid Sol.)+CO_2 (Solid Sol.)+CH_4⇌(Solid Sol.)+2H_2 On account of the unstableness of Fe_3C, after iron or steel is saturated with carbon the equilibria coincide with 2CO⇌C+CO_2 or CH_4⇌C+2H_2. He carried out experiments on carburizing of the electrolytic iron sheet for a long time at various temperatures with the solid carburizing mixture, and the result obtained was that C contents absorbed in the iron sheet coincided with the saturated concentration of graphite in austenite. He cosidered that this result proved the truth of his own theory. The authors also carried out carburizing experiments with the electrolytic iron wire, 0.5 mm thick, by pure CO gas, and found that at a temperature below A_1 point the formation of Fe_3C was surely recognized by means of magnetic and X-ray analyses, and at a temperature above A_1 point C was absorbed over the saturation value of that in austenite. In considering this fact, the authors supports the old theory of carburization. In the case of the pack carburizing, however, the carburizing action stops when C% reaches the saturation value at any temperature, but this fact does not suggest the carburizing equilibrium to be 2CO⇌C+CO_2 in all cases.
社団法人日本鉄鋼協会の論文
1939-08-25

滲炭平衡に就て

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