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Chunky graphite formation in ductile cast irons: effect of silicon, carbon and rare earths

De la Torre, Urko and Lacaze, Jacques and Sertucha, Jon Chunky graphite formation in ductile cast irons: effect of silicon, carbon and rare earths. (2016) International Journal of Materials Research, 107 (11). 1041-1050. ISSN 1862-5282

(Document in English)

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Official URL: http://dx.doi.org/10.3139/146.111434


Use of rare earths, high silicon and carbon contents, and low cooling rates are reported as possible reasons for formation of chunky graphite in ductile iron castings. The understanding of this graphite degeneration is however limited, and the above conclusions are still controversial. To get further insight into this topic, ductile cast iron melts have been prepared with various carbon and silicon contents and using nodularizing alloys with various rare earth levels. These melts have been cast in blocks with different sizes to include also the effect of cooling rate on graphite degeneration. Metallographic investigation revealed that the chunky-affected areas enlarge when decreasing the cooling rate, when increasing the silicon content and without low-level addition of rare earth. In the discussion, a schematic based on change of liquid/graphite interfacial energy with alloying elements is proposed which describes the conditions for the formation of chunky graphite instead of nodular graphite.

Item Type:Article
Additional Information:Thanks to Carl Hanser Verlag editor. The original PDF of the article can be found at http://www.hanser-elibrary.com/doi/10.3139/146.111434
HAL Id:hal-01581076
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > IK4 - Azterlan - Centro de Investigación Metalúrgica (SPAIN)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:01 Sep 2017 14:11

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