Influence of the Heat Treatment on the Microstructure and Corrosion Resistance of Austempered Ductile Iron (ADI)

Halina Krawiec (1) , Vincent Vignal (2) , Janusz Lelito (1) , A. Krystianiak (2) , Tyrala E (1)

1 AGH UST - AGH University of Science and Technology [Krakow, PL]
2 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne

The influence of the hold time of the austempering heat treatment at 280°C on the microstructure and corrosion resistance in NaCl-based media of austempered ductile iron was investigated using X-ray diffraction, micro-hardness measurements, corrosion tests and surface observations. Martensite was only found in the sample which was heat treated for a short period (10 minutes). Corrosion tests revealed that this phase does not play any role in the anodic processes. Numerous small pits were observed in the α-phase which is the precursor sites in all samples (whatever the value of the hold time of the austempering heat treatment).

Mots clés: austempered ductile iron; corrosion; microstructure; heat treatment

Domaines: Chimie

Halina Krawiec, Vincent Vignal, Janusz Lelito, A. Krystianiak, Tyrala E. Influence of the Heat Treatment on the Microstructure and Corrosion Resistance of Austempered Ductile Iron (ADI). Archives of Metallurgy and Materials, 2020, ⟨10.24425/amm.2019.131108⟩. ⟨hal-03024566⟩