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Metallurgical and Materials Transactions B

, Volume 47, Issue 5, pp 2744–2753 | Cite as

Active Mg Estimation Using Thermal Analysis: A Rapid Method to Control Nodularity in Ductile Cast Iron Production

  • Ramon Suárez
  • Jon Sertucha
  • Pello Larrañaga
  • Jacques LacazeEmail author
Article

Abstract

Appropriate nodularity in ductile iron castings is strongly associated with the presence of high enough not combined Mg dissolved in the melt to cast. However, the residual Mg which is commonly measured for production control accounts for both dissolved Mg and Mg combined as oxides and sulfides. To account for the uncertainties associated with such a control, it is quite usual to over treat the melt with the risk of porosity appearance. A new methodology based on thermal analysis has been developed in the present work so as to estimate the amount of free Mg dissolved in the melt ready for pouring. A combination of Te mixture and a new “reactive mixture” composed of sulfur plus a commercial inoculant has been prepared for this purpose. This reactive mixture is able to transform the magnesium remaining dissolved in the melt to combined forms of this element. Experiments performed both during start of production (when Mg overtreatment is usual) and during normal mass production indicate that important variations of free Mg occur without relevant changes in residual Mg content as determined by spectrometry. The method developed in the present work has shown to be highly effective to detect those melt batches where active Mg content is not high enough for guaranteeing a correct nodularity of castings. Selection of proper active Mg thresholds and a correct inoculation process are critical to avoid “false”-negative results when using this new method.

Keywords

Ductile Iron Graphite Particle Metastable Solidification Gray Cast Iron Gray Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This paper is based on work supported by the Industry Department of the Spanish Government (PROFIT FIT-020600-2005-16). The authors would like to thank Betsaide, S.A.L. and Fuchosa, S.L. foundries for all the collaborating efforts made in the experimental work.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Ramon Suárez
    • 1
    • 2
  • Jon Sertucha
    • 1
  • Pello Larrañaga
    • 1
  • Jacques Lacaze
    • 3
    Email author
  1. 1.Ingeniería, I+D y Procesos de Fundición, IK4-AzterlanDurangoSpain
  2. 2.Veigalan Estudio 2010DurangoSpain
  3. 3.CIRIMAT, Université de ToulouseToulouse Cedex 4France

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