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Open AccessArticle

The Role of Microstructure on the Tensile Plastic Behaviour of Ductile Iron GJS 400 Produced through Different Cooling Rates—Part II: Tensile Modelling

1
National Research Council of Italy (CNR)—Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), via R. Cozzi 53, 20125 Milan, Italy
2
Faculty of Foundry Engineering, Department of Cast Alloys and Composites Engineering, AGH University of Science and Technology, 30-059 Krakow, Poland
3
Zanardi Fonderie S.p.A., via Nazionale 3, 37046 Minerbe (VR), Italy
*
Author to whom correspondence should be addressed.
Metals 2019, 9(9), 1019; https://doi.org/10.3390/met9091019
Received: 30 August 2019 / Revised: 16 September 2019 / Accepted: 17 September 2019 / Published: 19 September 2019
(This article belongs to the Special Issue Cast Irons: Properties and Applications)
Tensile testing on ductile iron GJS 400 with different microstructures produced through four different cooling rates was performed in order to investigate the relevance of the microstructure’s parameters on its plastic behaviour. Tensile flow curve modelling was carried out with the Follansbee and Estrin-Kocks-Mecking approach that allowed for an explicit correlation between plastic behaviour and some microstructure parameters. In the model, the ferritic grain size and volume fraction of pearlite and ferrite gathered in the first part of this investigation were used as inputs, while other parameters, like nodule count and interlamellar spacing in pearlite, were neglected. The model matched very well with the experimental flow curves at high strains, while some mismatch was found only at small strains, which was ascribed to the decohesion between the graphite nodules and the ferritic matrix that occurred just after yielding. It can be concluded that the plastic behaviour of GJS 400 depends mainly on the ferritic grain size and pearlitic volume fraction, and other microstructure parameters can be neglected, primarily because of their high nodularity and few defects. View Full-Text
Keywords: ductile cast irons; tensile tests; microstructure; plasticity modelling ductile cast irons; tensile tests; microstructure; plasticity modelling
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Angella, G.; Donnini, R.; Ripamonti, D.; Górny, M.; Zanardi, F. The Role of Microstructure on the Tensile Plastic Behaviour of Ductile Iron GJS 400 Produced through Different Cooling Rates—Part II: Tensile Modelling. Metals 2019, 9, 1019.

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