Damaging micromechanisms in ferritic ductile cast iron in as-cast and ferritized condition

DIEGO O. FERNANDINO; VITTORIO DI COCCO; LAURA D' AGOSTINO; FRANCESCO IACOVIELLO

Procedia Structural Integrity

ELSEVIER SCIENCE BV

Año: 2017

2452-3216

Mechanical behavior and damaging micromechanisms in Ductile Cast Irons (DCIs) are strongly effected by matrix microstructure (e.g., phases volume fraction, grains size and grain distribution) and graphite nodules morphology peculiarities (e.g., nodularity level, dimension, distribution etc.). The influence of the graphite nodules depends both on the matrix microstructure and the loading conditions (e.g., static, quasi-static or cyclic loadings). According to the most recent results, these graphite nodules show a mechanical properties gradient inside the graphite nodules, with the graphite elements ? matrix debonding as only one of the possible damaging micromechanisms. In this work, two different DCIs were investigated (with a ferritic and a ferritized matrix) focusing the damaging micromechanisms in graphite nodules due to tensile stress. Specimens lateral surfaces were observed using a Scanning Electron Microscope (SEM) during the tests following a step by step procedure.