High-strength bainitic cast iron with spheroidal graphite
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The change in the properties of high-strength cast iron in relation to isothermal holding time is extremal in character.
The best mechanical properties of cast iron with spheroidal graphite are obtained at 300–400° with 25–40% retained austenite.
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.
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.
The isothermal bainitic transformation is divided into three stages that differ in the average rate of the transformation.
KeywordsGraphite Austenite Martensite Ductility Average Rate
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