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Changes in the structure and properties of cylinder sleeves of internal combustion engines after laser treatment

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Conclusions

  1. 1.

    With a high rate of crystallization from the liquid state one finds FeO, Fe2O3, and Fe3O4 (total concentration ∼40%), 10% austenite, 30% cementite, and 20% martensite in a layer 0.1 μm thick on the surface of SCh24-44 gray cast iron. At a depth of ∼1 μm the austenite and martensite comprise 20% and cementite the remainder.

  2. 2.

    X-ray analysis showed that in addition to cementite austenite, and martensite the cast iron also contains metastable phases, austenite, and ε phase after laser treatment, although the intensities of the reflections decrease sharply after tempering at 300°.

  3. 3.

    A layer as deep as 50 μm contains 8–10% C, which points to saturation of the solid solution with carbon not only with solution of graphite but also from the carbon-containing paint applied to blacken the surface before the laser treatment.

  4. 4.

    The hardness of the melted zone is H50 1000–1200, the hardness of the heat-affected zone H50 800–1100.

  5. 5.

    Bench tests for 50 h showed that the laser treatment of cylinder sleeves of gray cast iron SCh24-44 in V engines increases the wear resistance to the level of cylinder sleeves with Niresist inserts.

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Literature cited

  1. 1.

    S. I. Reiman, K. P. Mitrofanov, and V. S. Shpinel', Use of Mössbauer Spectroscopy to Analyze the Phase Composition of the Surface of Massive Samples [in Russian], No. 9, Nauka, Moscow (1979), p. 170.

  2. 2.

    S. Hanna et al., "Spectra obtained with polarized radiation from57Fe nuclei and the hyperfine structure," in: The Mössbauer Effect [Russian translation], Yu. Kagan (ed.), IL, Moscow (1962), p. 444.

  3. 3.

    R. Ruhl and M. Cohen, Trans. Met. Soc. AIME,245, 241 (1968).

  4. 4.

    N. V. Edneral, V. A. Lyakishev, and Yu. A. Skakov, "Structure and phase composition of Fe+3.8% C+4.7% Si quenched from the liquid condition," Fiz. Met. Metalloved.,43, No. 2, 426 (1977).

  5. 5.

    I. N. Bogachev, Metallography of Cast Iron [in Russian], Metallurgizdat, Sverdlovsk (1962), p. 17.

  6. 6.

    D. Swoboda and K. Swoboda, Radex Rundschau, No. 3, 204 (1970).

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Additional information

Moscow Automobile Factory. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 10–13, September, 1980.

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Sedunov, V.K., Andriyakhin, V.M., Chekanova, N.T. et al. Changes in the structure and properties of cylinder sleeves of internal combustion engines after laser treatment. Met Sci Heat Treat 22, 630–634 (1980). https://doi.org/10.1007/BF00700684

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Keywords

  • Austenite
  • Fe2O3
  • Martensite
  • Wear Resistance
  • Cementite