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Analysis of stress triaxiality influence: ferritic DCI damaging micromechanisms
Last modified: 2013-06-27
Abstract
Ductile cast irons are characterized by an interesting mechanical properties combination (high
ductility, high tensile strength, good wear resistance). Graphite nodules morphological peculiarities and matrix
microstructure (both chemical composition and heat treatment controlled) strongly affect the mechanical
behaviour and the damaging micromechanisms, also considering very simple loading conditions (e.g. tensile test
conditions). Focusing ferritic ductile irons, matrix - graphite nodule debonding is often identified as the main
damaging micromechanism, and numerous studies provided analytical laws to describe growth of a single void,
depending on the void geometries and matrix behaviour. In this work, ferritic DCI damaging micromechanisms
were investigated, under uniaxial tensile tests, considering the triaxiality influence
ductility, high tensile strength, good wear resistance). Graphite nodules morphological peculiarities and matrix
microstructure (both chemical composition and heat treatment controlled) strongly affect the mechanical
behaviour and the damaging micromechanisms, also considering very simple loading conditions (e.g. tensile test
conditions). Focusing ferritic ductile irons, matrix - graphite nodule debonding is often identified as the main
damaging micromechanism, and numerous studies provided analytical laws to describe growth of a single void,
depending on the void geometries and matrix behaviour. In this work, ferritic DCI damaging micromechanisms
were investigated, under uniaxial tensile tests, considering the triaxiality influence
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