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Diego Omar Fernandino https://orcid.org/0000-0003-4647-2663 Vittorio Di Cocco https://orcid.org/0000-0002-1668-3729 Nicolas Tenaglia https://orcid.org/0000-0001-6372-8881 Costanzo Bellini https://orcid.org/0000-0003-4804-6588 Francesco Iacoviello https://orcid.org/0000-0002-9382-6092 Roberto Enrique Boeri https://orcid.org/0000-0001-7083-579X

Abstract

The goal of this work is to improve the understanding of the relation between the microstructural characteristics of Intercritical Austempered Ductile Cast Iron (IADI) and the damage micromechanisms observed during its tensile loading. The experimental methodology involves heat treatments to obtain IADI and the assessment of the damage mechanisms (sequence and occurrence) during step by step tensile testing. The damage evaluation was carried out by observing the surface of the tensile test specimen with optical and scanning electron microscopy.


The results show that small cracks start forming soon after the yield stress is surpassed. The crack initiation is preferentially located at matrix-nodule interface. As loading increases, cracks also develop at the ferritic grain boundaries and the ausferritic/ferritic interfaces. Consequently, at higher strain values, a competition between the plastic deformation on internodular zones and crack propagation along ausferritic phase is observed.


Finally, the final fracture is produced by the propagation of cracks across the internodular ligaments and through the ausferritic/ferritic interface that later coalesce into a single dominant crack leading to the material failure.

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Section
Fracture

How to Cite

Fernandino, D. O., Di Cocco, V., Tenaglia, N., Bellini, C., Iacoviello, F. and Boeri, R. E. (2019) “Microstructural damage evaluation of ferritic-ausferritic spheroidal graphite cast iron”, Frattura ed Integrità Strutturale, 14(51), pp. 477-485. doi: 10.3221/IGF-ESIS.51.36.