復炭に關する研究 (I) : 一般の固態滲炭劑による復炭について

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The Si-Mn and carbon steels were decarburized in H_2, CaO, CaO+10% Fe_2O_3 and in air, and then carburized at 1000℃ for 2hrs in charcoal+20% BaCO_3 : The results obtained were as follows : - (1) In the non-oxidation decarburization, carbon is more diffusible through the decarburized layer than through that of the oxidation decarburization. In the former carbon content-depth curves and hardness-depth ones have lower gradient from surface to inner part, the surface carbon content and surface hardness are higher and the decarburized layer becomes far thicker than those of the latter. The decarburized amount due to the non-oxidation decarburization is significantly smaller than that due to the oxidation decarburization. The decarburized amount in steels due to hydrogen is the smallest and that due to CaO is the next. On the other hand, the amount of weight-decrease in the latter is smaller than that in the former, probably because in the latter steels are oxidized slightly during the deoxidation treatment. (2) In the oxidation decarburization, carbon is not so diffusible through the surface layer due to the simultaneous oxidation ; hence, curves of carbon content and hardness have steep gradients from surface to inner part, and the surface carbon content and the surface hardness beccome markedly low. The decarburized amount is by far larger than that of a non-oxidation decarburization. But, the decarburized depth is not thick, especially in the specimen decarburized in air. The decarburized-layer and -amount in Si-Mn steels are larger than those in carbon steels. (3) In the carbon restoration, the carburized-depth and -amount are large in specimens of non-oxidation decarburization, especially in specimens decarburized with hydrogen, probably because of good carbon diffusion and of slight oxidation in the hydrogen-decarburized layer. In specimens of oxidation decarburization, both the carburized-depth and -amount are small, especially in specimens decarburized in air, which may be explained by the difficult diffusion of carbon and slight reduction in the decarburized layer. (4) Hardness of the decarburized layer can be recovered easily in non-oxidation specimens, while that of the decarburized layer by the oxidation decarburization is difficult to be restored and the surface hardness becomes high, but the carburized depth becomes thin. The phenomenon is explained by the little diffusion and surface accumulation of carbon in specimens received oxidation decarburization.
社団法人日本鉄鋼協会の論文
1952-08-25

復炭に關する研究 (I) : 一般の固態滲炭劑による復炭について

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