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Characterization of Microstructure and Mechanical Properties of High Chromium Cast Irons Using SEM and Nanoindentation

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Abstract

The effects of composition changes and heat treatment on the microstructure and mechanical properties of high-chromium white cast irons were studied in order to characterize possible improvements in product performance and machinability. Materials characterization was performed using nanoindentation, SEM, and EDS techniques. Present results show that changes in carbon and silicon contents as well as heat treatment strongly affect the mechanical properties and their variation in the material. In the as-cast condition, the sample with relatively lower carbon and silicon contents has an austenite-martensite matrix and is much harder than the sample with relatively higher carbon and silicon contents having more eutectic carbides in a bainite matrix. Annealing leads to softening of the materials relative to the as-cast condition, with the relatively higher carbon-silicon material being marginally harder due to the presence of more eutectic carbides. A similar trend is seen after the hardening treatment, and the presence of primary carbide can restrict the extent of hardening due to the loss of alloying elements from the matrix.

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Acknowledgments

This research is a part of the strategic research program the Sustainable Production Initiative SPI, cooperation between Lund University and Chalmers University of Technology. The authors would like to thank Xylem Water Solution AB for providing the work materials and support. One of the authors (L. C.) appreciates the financial support by Chinese Scholarship Council.

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Authors and Affiliations

  1. Division of Production and Materials Engineering, Lund University, Box 118, 22100, Lund, Sweden

    Ling Chen, Jinming Zhou & Jan-Eric Ståhl

  2. Division of Materials Engineering, Lund University, Box 118, 22100, Lund, Sweden

    Srinivasan Iyengar & Krystof Turba

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  1. Ling Chen
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  2. Srinivasan Iyengar
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  3. Jinming Zhou
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  4. Krystof Turba
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  5. Jan-Eric Ståhl
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Correspondence to Ling Chen.

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Chen, L., Iyengar, S., Zhou, J. et al. Characterization of Microstructure and Mechanical Properties of High Chromium Cast Irons Using SEM and Nanoindentation. J. of Materi Eng and Perform 24, 98–105 (2015). https://doi.org/10.1007/s11665-014-1245-8

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  • DOI: https://doi.org/10.1007/s11665-014-1245-8

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