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Structure of carbonitrided layers containing increased concentrations of nitrogen

Conclusions

  1. 1.

    Under conditions which prevent denitrogenation it is possible to obtain good carbonitrided layers having increased hardness and residual austenite containing nitrogen.

  2. 2.

    The presence of an increased amount of nitrogen in the carbonitrided layers transforms the system Fe−C−N into the region having a higher solubility of nitrogen in iron. The total concentration of nitrogen and carbon in the solid solution increased to 1.8%, and there is a simultaneous increase in the amount of carbonitride phases based on the nitride of the alloying elements.

  3. 3.

    The total amount of carbon and nitrogen in the carbonitrided layers and the temperature of the final zone of the furnace has a significant effect on the concentration of nitrogen in the solid solution.

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Literature cited

  1. 1.

    L. M. Semenova, M. P. Sidel'kovskii, and A. N. Minkevich, "The nature of the dark-field component-defects in the carbonitrided layers," Izv. Vyssh. Uchebn. Zaved., Chern. Metal., No. 6, 114–118 (1972).

  2. 2.

    V. I. Krylov, L. M. Semenova, B. Z. Slobin, and G. E. Kucheruk, "The effect of carbonitride defects on the fatigue strength of pinion gears made of steel 25KhGT," Metalloved. Term. Obrab. Met., No. 12, 33–37 (1971).

  3. 3.

    V. I. Shapochkin and L. M. Semenova, "Studies on the ‘dark-field component’ in carbonitrided layers," Izv. Vyssh. Uchebn. Zaved., Chern. Met., No. 5, 125–129 (1985).

  4. 4.

    E. D. Gyulikhandanov, L. M. Semenova, and V. I. Shapochkin, "The effect of high-temperature carbonitriding on the structure, phase composition, and properties of lowalloy steels," Metalloved. Term. Obrab. Met., No. 4, 10–14 (1984).

  5. 5.

    L. M. Semenova, S. A. Pegisheva, L. V. Yudina, et al., "Experimental work VgTZ on the carbonitriding of pinions with high concentration of nitrogen in the layer," Doctoral Thesis, All-Union Scientific Research Seminar "Technology and Equipment for newly developed tractor and agricultural machine components," Ministry of Agricultural Machine Building, Volgograd (1988).

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Additional information

Leningrad Polytechnic Institute, NPO "VNIITMASh". Volgograd State Teacher's Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 12–15, May, 1990.

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Gyulikhandanov, E.L., Semenova, L.M. & Shapochkin, V.I. Structure of carbonitrided layers containing increased concentrations of nitrogen. Met Sci Heat Treat 32, 326–330 (1990). https://doi.org/10.1007/BF00700035

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Keywords

  • Nitrogen
  • Iron
  • Furnace
  • Austenite
  • Solid Solution