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

  • Urko de la Torre , Jacques Lacaze and Jon Sertucha
Published/Copyright: November 3, 2016
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 107 Issue 11

Abstract

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.

Keywords: Ductile cast iron; Heavy section casting; Chunky graphite; Rare earth; Silicon
*Correspondence address, Jacques Lacaze, CIRIMAT, Université de Toulouse, ENSIACET, 4 rue Monso, CS 44362, Toulouse 31030, France, Tel.: +33-5-34-32-34-15, Fax: +33-5-34-32-33-99, E-mail: , Web: http://cirimat.cnrs.fr/

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Received: 2016-06-07
Accepted: 2016-08-26
Published Online: 2016-11-03
Published in Print: 2016-11-10

© 2016, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111434
Keywords for this article
Ductile cast iron; Heavy section casting; Chunky graphite; Rare earth; Silicon

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. In-situ annealing and computation study of cube texture development in a commercial aluminum alloy
  5. Dislocation dynamics modeling of plastic deformation in single-crystal copper at high strain rates
  6. Investigation of mechanical properties of tubular aluminum foams
  7. Dependence of microstructure, microhardness, tensile strength and electrical resistivity on growth rates for directionally solidified Zn-Al-Sb eutectic alloy
  8. Effects of temperature on fatigue limits and fracture morphologies of 40Cr steels formed by warm extrusion
  9. Synthesis of an oxidation-resistant SiC coating on graphite and modeling analysis with thermodynamics calculations
  10. Improved corrosion inhibition of 3-amino-1,2,4-triazole on mild steel electrode in HCl solution using surface nanocrystallization
  11. Chunky graphite formation in ductile cast irons: effect of silicon, carbon and rare earths
  12. Fabrication of 3D porous MoS2–GO nanocomposite monolith as a promising adsorbent
  13. Short Communications
  14. Two-stage method of synthesis of ultrafine powder of α-phase metallic cobalt
  15. Developing a multifunctional bio-ceramics composite based on β-tricalcium phosphate working as a single carrier for calcium supplement and low-dose drugs
  16. DGM News
  17. DGM News
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