復炭に關する研究 (III) : 黄血鹽を含む固態滲炭劑による復炭について

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The various decarburized layers obtained by different decarburizing treatments were carburized with the solid carburizer containing 20% of dehydrated K_4Fe(CN)_6, and the merits of this carbnrizing material were disscussed, following results being obtained : - (1) The solid carburizer containing K_4Fe(CN)_6 was different from the common solid carburizer as K_4Fe(CN)_6 evolved (CN)_2 gas by being heated at 600℃∿700℃, and it acted as a nitriding agent as well as a carburizing one. This decomposition completed in a short time at about 700℃, and so the carbonitriding power was strong in an earlier time in the treatment. (2) The carbon-restoration of the decarburized layer of the specimen with the oxidation decarburization was attained more easily by this solid carburizer than that with the non-oxidation decarburization. With this carburizing material the surface hardness became very high and the penetration was considerably deep. While, as already mentioned in the previous paper, (Tetsu-to-Hagane, 38, 1952, Nos.8&9, pp.25&26) the restoration of the decarburized layer with the oxidation-decarburization was difficult. when treated with the common solid carburizer containing BaCO_3. (3) Considering the fact that the oxidized steel is hardened with this carburizer more easily than the non-oxidized steel, the hardening of steels treated with this carburizer containing Fe_2O_3 was examined. In this case the carburizing power of the common carburizer was suppressed, while carbonitriding power by a gas constituent composed of C-N-O, which would be explained in details lately, became markedly large. The carbonitriding power for non-oxidized steels became largest, and both the surface hardness and the increment of hardness ⊿H, calculated from the hardened area on the section of carburized specimen, became maximum at 5% Fe_2O_3. However if, Fe_2O_3 exceeded 5%, the carbonitriding power became reduced, and both the surface hardness and the ⊿H became small, which was caused by the excess oxygen. In practice, as the decarburization was always accompanied by the oxidation, the carbon-restoration was effciently attained with this carburizer, the common carburizer being not appropriate.
社団法人日本鉄鋼協会の論文
1953-04-25

復炭に關する研究 (III) : 黄血鹽を含む固態滲炭劑による復炭について

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