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Effect of As-cast Surface on Oxidation Behavior of High-Si Ductile Irons

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Abstract

The as-cast components in ductile iron have external and internal surfaces formed during solidification in the mold, and a significant portion of the original or modified as-cast surface is present during casting service. In foundry practice, the as-cast surface is referred to as “casting skin.” A casting skin has specific features which principally differ from the casting bulk: (i) finer micro-structure, determined by higher cooling rate, (ii) internally formed defects (crack, porosity), (iii) incorporated phases from metal–mold–gas interactions, (iv) near surface chemistry depletion, and much more. The role of the casting skin on mechanical integrity of the entire cast component at room temperature has been determined previously for many cases. However, the effect of the casting skin in ductile iron on high-temperature performance has not been determined because, as a rule, high-temperature oxidation tests are performed using specimens with a perfect surface after removing casting skin by machining. Considering the specific structure of the casting skin, its high-temperature oxidation behavior could be significantly different when compared to the main casting bulk. In this article, the effect of the casting skin was evaluated during high-temperature oxidation tests of several high-Si-alloyed ductile irons that were designed for high-temperature applications. This study sheds light on high-temperature performance of ductile iron components that are used in service with a high proportion of the as-cast surface intact.

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References

  1. S. Boonmee, Ductile and compacted graphite iron casting skin – evaluation effect on fatigue strength and elimination (Ohio State University, 2013)

    Google Scholar 

  2. J. Sertucha, J. Lacaze, Review casting defects in sand-mold cast irons—an illustrated review with emphasis on spheroidal graphite cast irons. Metals 12, 504 (2022)

    Article  CAS  Google Scholar 

  3. W. Kurz, B. Giovanola, R. Trivedi, Theory of microstructural development during rapid solidification. Acta Melall. 34, 823 (1986)

    CAS  Google Scholar 

  4. D.M. Stefanescu, Science and engineering of casting solidification, 3rd edn. (Springer, Cham, Switzerland, 2015)

    Book  Google Scholar 

  5. M. Holtzer, M. Gorny, R. Danko, Microstructure and properties of ductile iron and compacted graphite iron casting. The Effect of Mold Sand/Metal Interface Phenomena, Springler Int. Publ. (2015)

  6. S. Boonmee, B. Gyesi, D. Stefanescu, Casting skin of compacted graphite iron part I: evaluation and mechanism for formation. AFS Trans. 118, 205 (2010)

    CAS  Google Scholar 

  7. A. Kutz et al., Microstructural adjustment of the degenerated graphite layer in ductile iron for targeted evaluation on the fatigue properties. Int. J. Metalcast 14, 1183 (2020)

    Article  CAS  Google Scholar 

  8. D. Anca et al., Sulfur and oxygen effects on high-Si ductile iron casting skin formation. Coatings 10(7), 618 (2020)

    Article  CAS  Google Scholar 

  9. S. Boonmee, D. Stefanescu, Effect of casting skin on fatigue properties of CG iron. Int J Metacast 7, 15–26 (2013). https://doi.org/10.1007/BF03355550

    Article  CAS  Google Scholar 

  10. D. Stefanescu, S. Wills, J. Massone et al., Quantification of casting skin in ductile and compacted graphite irons and its effect on tensile properties. Int. J. Metalcast. 2, 7–28 (2008). https://doi.org/10.1007/BF03355433

    Article  CAS  Google Scholar 

  11. S. Boonmee, M. Moran, D. Stefanescu, On the effect of the casting skin on the fatigue properties on CG iron. AFS Trans. 119, 421 (2011)

    CAS  Google Scholar 

  12. W. Peach et al., Effect of Near-Surface Metallurgy on Machinability of Gray Cast Iron, Paper 08-139, AFS Trans. (2008)

  13. W. Peach et al. Near-surface machinability of gray cast iron, paper 09-035, AFS Trans. (2009)

  14. S. Lekakh et al., Prevention of high-temperature surface degradation in SiMo cast irons by Cr and Al alloying. Met. Mater. Trans. B 51B, 2542 (2020)

    Article  Google Scholar 

  15. S. Lekakh et al., High temperature oxidation and decarburization of SiMo cast iron in air and combustion atmospheres. Oxid. Met. 95, 251 (2021)

    Article  CAS  Google Scholar 

  16. S. Lekakh et al., Effect of micro-structural dispersity of SiMo ductile iron on high temperature performance during static oxidation. Metals 12, 661 (2022)

    Article  CAS  Google Scholar 

Download references

Funding

This research was supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Award Number DE-EE0008458.

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Authors and Affiliations

  1. Missouri University of Science and Technology, Rolla, MO, 65409, USA

    Simon Lekakh, Asebi Bofah, Ron O’Malley & Laura Bartlett

  2. Research and Innovation Center, Ford Motor Company, Dearborn, MI, 48124, USA

    Larry Godlewski & Mei Li

Authors
  1. Simon Lekakh
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  2. Asebi Bofah
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  3. Ron O’Malley
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  4. Laura Bartlett
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  5. Larry Godlewski
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  6. Mei Li
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Correspondence to Simon Lekakh.

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Lekakh, S., Bofah, A., O’Malley, R. et al. Effect of As-cast Surface on Oxidation Behavior of High-Si Ductile Irons. Inter Metalcast 18, 60–68 (2024). https://doi.org/10.1007/s40962-023-01072-z

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  • DOI: https://doi.org/10.1007/s40962-023-01072-z

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