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Effect of surface preparation on the quality of components after low-temperature carbonitriding

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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    For the technological LTCN conditions that we investigated, a carbonitride layer 20–24 μm thick is formed on steel 45Kh, irrespective of the method of surface preparation: turning, grinding, polishing, and plastic surface deformation. The surface condition is downgraded as a result of LTCN (the greater the initial roughness, the greater the surface roughness).

  2. 2.

    The condition of the carbonitride layer (thickness, phase composition) of the diffusion zone (thickness, hardness distribution, lattice microdistortions, residual-stress distribution) is independent of the surface condition of the metal after preliminary (prior to LTCN) machining.

  3. 3.

    When a carbonitride layer up to 80 μm thick is formed, the dimensions of the component increase on a side by up to 33–35% of the thickness of the carbonitride layer.

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Literature cited

  1. Yu. V. Maksimov et al., "Mossbauer and radiographic investigation of the thermal decomposition of ɛ-iron nitride," Fiz. Met. Metalloved.,37, No. 2 (1974).

  2. V. E. Paranjpe, J. Met.,188, 20 (1950).

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Authors
  1. V. B. Fridman
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  2. T. V. Egorshina
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  3. T. I. Kirpicheva
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  4. E. E. Chesalova
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Additional information

Scientific-Research Institute of the Technology of Tractor and Farm-Machine Building. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 30–32, May, 1984.

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Fridman, V.B., Egorshina, T.V., Kirpicheva, T.I. et al. Effect of surface preparation on the quality of components after low-temperature carbonitriding. Met Sci Heat Treat 26, 354–356 (1984). https://doi.org/10.1007/BF00707408

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  • DOI: https://doi.org/10.1007/BF00707408

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