Conclusions
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1.
The change in the properties of high-strength cast iron in relation to isothermal holding time is extremal in character.
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2.
The best mechanical properties of cast iron with spheroidal graphite are obtained at 300–400° with 25–40% retained austenite.
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3.
Cast iron with spheroidal graphite whose matrix consists of a structural mixture of bainite, martensite, and retained austenite, with a predominance of martensite, is susceptible to premature failure.
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4.
The reduction of the amount of retained austenite with prolonged isothermal holding times leads to a reduction of the ductility; the strength characteristics decrease negligibly in this case.
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5.
The isothermal bainitic transformation is divided into three stages that differ in the average rate of the transformation.
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Literature cited
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Additional information
Czechoslovakia. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 19–22, July, 1978.
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Dorazill, É., Barta, B., Crhak, J. et al. High-strength bainitic cast iron with spheroidal graphite. Met Sci Heat Treat 20, 532–535 (1978). https://doi.org/10.1007/BF00780324
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DOI: https://doi.org/10.1007/BF00780324