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Real-time X-ray Radiography and Computational Modeling of Shrinkage Porosity Formation in Aluminum Alloy Castings

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Abstract

The formation of shrinkage porosity in an A356 aluminum alloy wedge casting is investigated using real-time video radiography. An image processing technique is developed to quantify the amount of porosity observed in the video. The transient temperature field is obtained using casting simulation. The results show that initially, sinks develop in the low solid fraction regions on the surface of the wedge. Once the surface becomes sufficiently solid to be rigid, the subsequent solidification shrinkage is accommodated by internal porosity. The internal porosity is found to nucleate and grow in the central part of the wedge where the solid fraction is the lowest. A computational model is developed to predict the formation of the surface sinks and the internal porosity. The model is validated using the experimental measurements and a parametric study is performed to investigate the sensitivity of the predictions to changes in the model parameters.

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Acknowledgments

The authors wish to thank Anil Sachdev, Gene Tuohy, Mike Walker, and Jason Traub for their support of the foundry real-time X-ray room at GM R&D and the work on this project.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, IA, 52242, USA

    Vahid Khalajzadeh & Christoph Beckermann

  2. GM Manufacturing Engineering, Global Propulsion System Center, Pontiac, MI, 48340, USA

    David D. Goettsch

Authors
  1. Vahid Khalajzadeh
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  2. David D. Goettsch
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  3. Christoph Beckermann
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Corresponding author

Correspondence to Christoph Beckermann.

Additional information

Manuscript submitted August 24, 2018.

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Khalajzadeh, V., Goettsch, D.D. & Beckermann, C. Real-time X-ray Radiography and Computational Modeling of Shrinkage Porosity Formation in Aluminum Alloy Castings. Metall Mater Trans A 50, 757–771 (2019). https://doi.org/10.1007/s11661-018-5018-0

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