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Effect of different thermal treatments and hardening amounts on several physical and mechanical properties of a spheroidal graphite cast iron

Kamel Meridja, Patrice Berthod

Several properties of cast irons may depend on the temperature history as some physical and mechanical ones. In this work the evolutions of microstructure, volume mass, compression properties and hardness resulting fromdifferent heat-treatment and cooling conditions were studied for a same initial spheroidal cast iron. Samples cut in a same ingot were subjected to austenitization then cooling at very different rates, eventually followed by medium temperature stage. Some of them were additionally compressed until reaching 800 to 1000 GPa. Their microstructure, volume mass, plastic deformation amount and hardness were characterized and compared to analyse the effects of thermal treatment and hardening in compression on the microstructure, hardness and density.