ガス浸炭窒化処理による表面生成相に関する研究

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  • On the Phase Formed on Surface by Gas Carbo-Nitriding
  • ガス シンタン チッカ ショリ ニ ヨル ヒョウメン セイセイソウ ニ カンスル ケンキュウ

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Steel foil samples were used so as to reach the equilibrium value by short treatment with the carbo-nitride gas, which is a mixture of CO and NH3 in various ratios. The reactions were made at 600∼900°C, and the following results were obtained:—(1) C,N contents reached the equilibrium value after 1∼2 hours of treatment, and afterwards the N contents made no change, but the C contents had the tendency of increasing variously according to the conditions of treatment. (2) The equilibrium C content showed a higher value than in carburized steel. Under the mixing ratio of CO:NH3=6:4,it was 0.58% at 600°C and at higher treating temperature, it increased and showed the highest value of 3.60% at 800°C. (3) Again under the same mixing ratio, the equilibrium N content was 10.28% at 600°C and with the rise of the treating temperature it decreased suddenly. (4) The high C,N contents are caused by the formation of ε-carbo-nitride, and to prevent the formation of this phase, because of this phase is not hardened by quenching, the treating temperature must be kept at 800∼830°C. (5) The change in C, N contents by change of the mixing ratio of CO, NH3 is small. (6) ε-phase precipitates Fe3C, graphite, and because of that, the C content increases as the time passes and these precipitating phenomena move to low temperature as the CO content increases. (7) ε-phase is a close-packed hexagonal lattice and as the treating temperature falls the lattice constant grows larger, and the axial ratio (c⁄a) approaches 1.633.

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