Abstract
1. The effect of spheroidal graphite inclusions on the failure of ferritic cast iron depends on the condition of the matrix: in a ductile matrix spheroidal graphite particles are centers of microcavity generation and they lead as a result of this to a reduction in the level of cast iron properties; in a brittle matrix graphite particles have a favorable tendency of retarding brittle crack development and under certain conditions they lead to a change in failure mechanism. 2. The effect of crack retardation at spheroidal graphite particles develops particularly clearly at low loading rates thus providing properties in cast iron comparable with steel.
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