Microstructure and mechanical properties of as-cast ferritic spheroidal cast iron for heavy section
DOI:
https://doi.org/10.3989/revmetalm.2006.v42.i1.3Keywords:
Ferritic spheroidal cast iron, As-cast, Heavy section, Cooling rate, Mechanical propertiesAbstract
In order to carry out a study of the effect of the cooling rate, the composition and the microstructure upon the mechanical properties of a cast iron with nodular graphite and ferrite matrix for heavy sections, one cube with an edge of 300 mm was manufactured through casting in sand molds. This cube contains, as it is habitual, silicon and magnesium which proceed from the inoculant (ferrosilicon) and from the nodulizant (Fe-Si-Mg). The effects of the size, shape and distribution of the graphite nodules and of the microstructure of the matrix upon the mechanical resistance, impact behaviour and fracture toughness of this cast iron are investigated in two zones of the cube which have been casted with a different cooling rate: the thermal centre and the surface. The chemical compositions and the techniques used to perform the mechanical tests and the metallographic analysis are suplied.
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