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Automated Classification and Analysis of Non-metallic Inclusion Data Sets

  • Topical Collection: Metallurgical Processes Workshop for Young Scholars
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Abstract

The aim of this study is to utilize principal component analysis (PCA), clustering methods, and correlation analysis to condense and examine large, multivariate data sets produced from automated analysis of non-metallic inclusions. Non-metallic inclusions play a major role in defining the properties of steel and their examination has been greatly aided by automated analysis in scanning electron microscopes equipped with energy dispersive X-ray spectroscopy. The methods were applied to analyze inclusions on two sets of samples: two laboratory-scale samples and four industrial samples from a near-finished 4140 alloy steel components with varying machinability. The laboratory samples had well-defined inclusions chemistries, composed of MgO-Al2O3-CaO, spinel (MgO-Al2O3), and calcium aluminate inclusions. The industrial samples contained MnS inclusions as well as (Ca,Mn)S + calcium aluminate oxide inclusions. PCA could be used to reduce inclusion chemistry variables to a 2D plot, which revealed inclusion chemistry groupings in the samples. Clustering methods were used to automatically classify inclusion chemistry measurements into groups, i.e., no user-defined rules were required.

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Acknowledgments

The authors gratefully acknowledge the support of the member companies of the Center for Iron and Steelmaking Research and the use of the Materials Characterization Facility at Carnegie Mellon University, supported by Grant MCF-677785.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Center for Iron and Steelmaking Research, Carnegie Mellon University, Pittsburgh, PA, 15213, USA

    Mohammad Abdulsalam, Tongsheng Zhang & Bryan A. Webler

  2. Nucor Castrip Arkansas LLC, Blytheville, AR, 72315, USA

    Jia Tan

Authors
  1. Mohammad Abdulsalam
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  2. Tongsheng Zhang
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  3. Jia Tan
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  4. Bryan A. Webler
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Correspondence to Mohammad Abdulsalam.

Additional information

Manuscript submitted September 01, 2017.

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Abdulsalam, M., Zhang, T., Tan, J. et al. Automated Classification and Analysis of Non-metallic Inclusion Data Sets. Metall Mater Trans B 49, 1568–1579 (2018). https://doi.org/10.1007/s11663-018-1276-x

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  • DOI: https://doi.org/10.1007/s11663-018-1276-x

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