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Effect of Cr/C Ratio on Microstructure and Corrosion Performance of Cr3C2-NiCr Composite Fabricated by Laser Processing

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Abstract

The present study focuses on the effect of different Cr/C ratios on the microstructure, microhardness, and corrosion resistance of Ni-based laser clad hardfacings, reinforced by in situ synthesized chromium carbide particles. Cr3C2-NiCr composites have been laser processed with graphite/Cr/Ni powder blends with varying Cr/C ratios. Following phase analysis (x-ray diffraction) and microstructure investigation (scanning electron microscopy; energy dispersive x-ray analysis; transmission electron microscopy), the solidification of laser melt pool is discussed, and the corrosion resistances are examined. Several different zones (planar, dendritic, eutectic and re-melt zone) were formed in these samples, and the thicknesses and shapes of these zones vary with the change of Cr/C ratio. The sizes and types of carbides and the content of reserved graphite in the composites change as the Cr/C ratio varies. With the content of carbides (especially Cr3C2) grows, the microhardness is improved. The corrosive resistance of the composites to 0.2M H2SO4 aqueous solution decreases as the Cr/C ratio reduces owing to not only the decreasing Cr content in the NiCr matrix but also the galvanic corrosion formed within the carbide and graphite containing Ni matrix.

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Acknowledgments

This research was financially supported by the National Natural Science Foundation of P. R. China (51171118, 11204071/A040405) and Research Project of HBUT (337234).

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Authors and Affiliations

  1. Laser Group, Department of Mechanical Engineering, Hubei University of Technology, Wuhan, 430068, People’s Republic of China

    Deyuan Lou, Dun Liu, Peter Bennett, Lie Chen & Qibiao Yang

  2. Liaoning Provincial Key Laboratory of Advanced Materials, Shenyang University, Shenyang, 110044, People’s Republic of China

    Chunlin He

  3. Laser Group, Department of Engineering, University of Liverpool, Liverpool, L693GQ, UK

    Eamonn Fearon & Geoff Dearden

Authors
  1. Deyuan Lou
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  2. Dun Liu
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  3. Chunlin He
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  4. Peter Bennett
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  5. Lie Chen
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  7. Eamonn Fearon
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Correspondence to Deyuan Lou or Dun Liu.

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Lou, D., Liu, D., He, C. et al. Effect of Cr/C Ratio on Microstructure and Corrosion Performance of Cr3C2-NiCr Composite Fabricated by Laser Processing. J. of Materi Eng and Perform 25, 312–319 (2016). https://doi.org/10.1007/s11665-015-1843-0

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  • DOI: https://doi.org/10.1007/s11665-015-1843-0

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