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

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  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

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    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.

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    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.

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

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    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).

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

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    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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  • Austenite
  • Fe2O3
  • Martensite
  • Wear Resistance
  • Cementite