Electron Microscopy Characterization of Ni-Cr-B-Si-C Laser Deposited Coatings

I. Hemmati, J. C. Rao, V. Ocelik*, J. Th. M. De Hosson

*Bijbehorende auteur voor dit werk

    OnderzoeksoutputAcademicpeer review

    44 Citaten (Scopus)
    21 Downloads (Pure)

    Samenvatting

    During laser deposition of Ni-Cr-B-Si-C alloys with high amounts of Cr and B, various microstructures and phases can be generated from the same chemical composition that results in heterogeneous properties in the clad layer. In this study, the microstructure and phase constitution of a high-alloy Ni-Cr-B-Si-C coating deposited by laser cladding were analyzed by a combination of several microscopy characterization techniques including scanning electron microscopy in secondary and backscatter imaging modes, energy dispersive spectroscopy (EDS), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). The combination of EDS and EBSD allowed unequivocal identification of micron-sized precipitates as polycrystalline orthorhombic CrB, single crystal tetragonal Cr5B3, and single crystal hexagonal Cr7C3. In addition, TEM characterization showed various equilibrium and metastable Ni-B, Ni-Si, and Ni-Si-B eutectic products in the alloy matrix. The findings of this study can be used to explain the phase formation reactions and to tune the microstructure of Ni-Cr-B-Si-C coatings to obtain the desired properties.

    Originele taal-2English
    Pagina's (van-tot)120-131
    Aantal pagina's12
    TijdschriftMicroscopy and Microanalysis
    Volume19
    Nummer van het tijdschrift1
    DOI's
    StatusPublished - feb.-2013

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