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Microhardness changes of inclusions of phosphorus compounds in gray irons between 20 and 300°C

  • Cast Irons
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Metal Science and Heat Treatment of Metals Aims and scope

Conclusions

An increase of temperature to 300°C results in a substantial decrease of the microhardness of certain phosphorus compound-type inclusions in gray irons. The attendant changes in microhardness of pearlite and ferrite were insignificant. The most pronounced softening was observed in the ternary eutectic Feα (P,C)+Fe3P+Cr23C6 and binary eutectic Fe3P+Fe3C. The relative difference of the microhardnesses (δ H) decreased uniformly. At 300°C it fell to 0 and 0.6, respectively.

For the ternary eutectic Feα (P,C)+Fe3P+Fe3C and carbide Cr23C6, the factor δ H assumed a certain intermediate value.

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References

  1. V. N. Svechnikov and Z. D. Panchenko, Effect of Manganese on the Structure of the Phosphide Eutectic, (Vliyanie Margantsa na Str. Fosf. Evt.) Reports of Kiev's Lenin Order Polytechnic Institute, Vol. XI 1952.

  2. V. P. Grechin, Piston Rings for Aircraft Engines, [Book] (Porshnevye Kol'tsa Aviat. Mot.), Oborongiz Press, 1939.

  3. K. N. Ipatov, Piston Rings for Transport Engines [Book] (Porshnevye Kol'tsa Transp. Mot.) Mashgiz Press, 1947.

  4. A. L. Baboshin, Metal Science and Heat Treatment of Pure Iron, Steel and Cast Iron [Book], Part II, ONTI Press, 1935. (Metallogr. i Term. Obr. Zhel. Stali i Chuguna).

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Authors and Affiliations

  1. Odessa Naval Engineering Institute, Odessa, USSR

    M. M. Snitkovskii & I. I. Silaev

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  1. M. M. Snitkovskii
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  2. I. I. Silaev
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Snitkovskii, M.M., Silaev, I.I. Microhardness changes of inclusions of phosphorus compounds in gray irons between 20 and 300°C. Met Sci Heat Treat 2, 285–289 (1960). https://doi.org/10.1007/BF00649671

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  • DOI: https://doi.org/10.1007/BF00649671

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