The sliding wear behavior of Carbidic Austempered Ductile Iron

GENTILI, M.; PEDRO, D. I.; DOMMARCO, R. C.

Florianópolis

Conferencia; 3rd International Brazilian Conference on Tribology - TriBoBR 2018; 2018

Universidad Tecnológica Federal do Paraná y otras

Austempered ductile iron with carbides (CADI) arises from the attempts of increasing the abrasive wear resistance of Austempered ductile irons (ADI). There are many studies on the abrasion performance of CADI, particularly considering its relation to the chemical composition and hence, its carbide content, casting procedure and heat treatment parameters [1]. However, its behavior under different wear mechanisms as contact fatigue or sliding has not been fully evaluated yet. CADI has a good balance of abrasive wear resistance and other mechanical properties when compared to competitive materials. Thus, its behavior under different wear mechanisms must be studied to evaluate its potential as a candidate material for different applications or tribosystems. Therefore, in this work, the sliding wear performance of CADI is studied, the mechanism of damage and its relationship to the microstructural characteristics. ADI is known by its good resistance to sliding or adhesive wear due to the presence of the graphite nodules. With the addition carbide forming elements in CADI the graphite content decreases but at the same time, carbides appear in the microstructure. This new phase is supposed to have a good resistance to adhesion due to a lack affinity to iron-based matrices and, at the same time, good resistance to penetration by hard particles and higher load carrying capacity.