Features of the structure and heat treatment of cast iron with vermicular graphite
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Due to a developed chemical inhomogeneity, ChVG has quite a wide intercritical temperature range Ac 1 s -Ac 1 f , which may be used, e.g., in heating for normalizing with the aim of increasing mechanical properties.
A ferrite-austenite structure is formed with heating in the intercritical temperature range, which makes it possible to obtain after air cooling of up to 750–780 MPa, δ up to 10–12%, anda up to 0.40–0.45 MJ/m2.
Cast iron ChVG may be recommended to replace cast iron forgings for the manufacture of engine components. The advantages of ChVG are simpler component production technology and higher mechanical properties.
KeywordsIron Mechanical Property Graphite Heat Treatment Cast Iron
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