This work presents the qualitative and quantitative changes in the products of isothermal transformation (reaction) in a ductile cast iron
austenite after supercooling to the temperature range Ar1. The austenitizing temperature considered in this work was 900, 960 or 1020°C.
The eutectoid reaction was investigated by metallographic examination at a holding temperature right below Ar11 (820°C) or right below
Ar12 (760°C). The quantitative metallographic examination was carried out with a light microscope (LM). The initial transformation stage
products were identified with a transmission electron microscope (TEM). The selected samples were studied for chemical
microsegregation of manganese, silicon, phosphorus, and carbon with an X-ray microanalyser (MAR). The tested cast iron material was
found to predominantly feature a eutectoid reaction in the metastable system the ratio of which was increasing with the austenitizing
temperature. The austenitizing temperature was found to be conducive to the evolution kinetics of individual phases and to the
graphitization kinetics of the eutectoid cementite that was formed during the contemplated reaction.