On the correlation between microstructural parameters and the thermo-mechanical fatigue performance of cast iron

Strain-controlled out-of-phase thermo-mechanical fatigue tests at 100–500 °C and various strain ranges were conducted on five cast iron grades, including one lamellar, three compacted spheroidal graphite iron. Investigations of morphology matrix characteristics performed to associate parameters, such as geometrical features inclusions the microhardness, performance each grade. From this, life a function maximum stress half-life, is found decrease consistently with increasing average inclusion length irrespective content. In contrast, no evident correlation between microhardness observed.