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Statistical Study to Evaluate the Effect of Processing Variables on Shrinkage Incidence During Solidification of Nodular Cast Irons

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Abstract

The study of shrinkage incidence variations in nodular cast irons is an important aspect of manufacturing processes. These variations change the feeding requirements on castings and the optimization of risers’ size is consequently affected when avoiding the formation of shrinkage defects. The effect of a number of processing variables on the shrinkage size has been studied using a layout specifically designed for this purpose. The β parameter has been defined as the relative volume reduction from the pouring temperature up to the room temperature. It is observed that shrinkage size and β decrease as effective carbon content increases and when inoculant is added in the pouring stream. A similar effect is found when the parameters selected from cooling curves show high graphite nucleation during solidification of cast irons for a given inoculation level. Pearson statistical analysis has been used to analyze the correlations among all involved variables and a group of Bayesian networks have been subsequently built so as to get the best accurate model for predicting β as a function of the input processing variables. The developed models can be used in foundry plants to study the shrinkage incidence variations in the manufacturing process and to optimize the related costs.

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Acknowledgments

The present work has been supported by the Centro para el Desarrollo Tecnológico Industrial (CDTI) of the Spanish Government (Ref. IDI-20150535). The authors would also like to thank Casting Ros, S. A. Foundry for all the collaborating efforts made in the experimental work.

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Authors and Affiliations

  1. Ingeniería, I+D y Procesos Metalúrgicos, IK4-AZTERLAN, Aliendalde auzunea 6, 48200, Durango, Bizkaia, Spain

    J. M. Gutiérrez, A. Natxiondo, J. Nieves, A. Zabala & J. Sertucha

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  1. J. M. Gutiérrez
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  2. A. Natxiondo
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  3. J. Nieves
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  4. A. Zabala
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Correspondence to J. Sertucha.

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Manuscript submitted August 14, 2016.

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Gutiérrez, J.M., Natxiondo, A., Nieves, J. et al. Statistical Study to Evaluate the Effect of Processing Variables on Shrinkage Incidence During Solidification of Nodular Cast Irons. Metall Mater Trans A 48, 1827–1840 (2017). https://doi.org/10.1007/s11661-017-3969-1

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