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Nodularity Control of Spheroid Ductile Cast Iron by Rayleigh Backscattering

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Abstract

Spheroid Ductile Cast Iron finds increasingly industrial use as a high strength material of high fatigue resistance. The material properties can be designed by density, shape and size of the graphite spheres—the nodularity—and the matrix microstructure. Until today, the near surface nodularity cannot be controlled nondestructively to take full advantage of the material quality especially at high loaded surface areas. A viable nondestructive approach we propose is based on ultrasonic backscattering preferably in the Rayleigh regime. First experiments with model samples proved significant contrast to distinguish materials with different graphite morphology and matrices. The claim of our tests is a fast and easy industrial control of nodularity in reference to a validated sample. The results encourage us for the development of a prototype equipment with optimized probe systems and inspection parameters. Quantified acceptance criteria still require systematic tests for optimized parameter settings and probe configurations on more representative samples provided by industry.

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Notes

  1. Siempelkamp Maschinen- und Anlagenbau GmbH, Krefeld, Germany.

  2. Q-NET Engineering GmbH, Saarbruecken, Germany.

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Acknowledgements

The research was funded by the Governmental program “Science”, Research Projects No. 11.3683.2017/4.6 and No. 11.6342.2017/8.9 and as well as by Tomsk Polytechnic University Competitiveness Enhancement Program grant, the Project No. VIU-IShNKB-77/2019. The sponsoring makes possible the collection, analysis and interpretation of data. We thank our industrial partners, Q-NET Engineering GmbH, Saarbruecken, Germany, and Siempelkamp Maschinen- und Anlagenbau GmbH, Krefeld, Germany for their professional support. The research would have not been possible without the European INTAS program through which a young scientist could work in a foreign laboratory. Cooperation and exchange of ideas create trust and friendship and good results.

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Authors and Affiliations

  1. National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk, Russia, 634050

    I. Bolotina, M. Kroening & D. Sednev

  2. Fraunhofer Institute Nondestructive Testing, University Campus, 66123, Saarbrücken, Germany

    I. Veile

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  1. I. Bolotina
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  2. M. Kroening
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  3. D. Sednev
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  4. I. Veile
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Correspondence to I. Bolotina.

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Bolotina, I., Kroening, M., Sednev, D. et al. Nodularity Control of Spheroid Ductile Cast Iron by Rayleigh Backscattering. J Nondestruct Eval 39, 4 (2020). https://doi.org/10.1007/s10921-019-0645-y

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  • DOI: https://doi.org/10.1007/s10921-019-0645-y

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