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STRATIFICATION MECHANISM AND INTERFACE CHARACTERIZATION OF(TiN),(TiC)/NiCrBSiCOMPOSITE COATINGS SYNTHESIZED BY LASER REMELTING

Author

Listed:
  • RONGXIANG LIU

    (School of Materials Science and Engineering, Harbin Institute of Technology, P. O. Box 433, Harbin 150001, P. R. China)

  • TINGQUAN LEI

    (School of Materials Science and Engineering, Harbin Institute of Technology, P. O. Box 433, Harbin 150001, P. R. China)

  • LIXIN GUO

    (School of Materials Science and Engineering, Harbin Institute of Technology, P. O. Box 433, Harbin 150001, P. R. China)

Abstract

TiC/TiN-reinforced composite coatings were fabricated on the substrate ofTi–6Al–4Valloy using laser remelting. X-ray diffraction (XRD) was used to identify the phases in the laser-clad composite coating; the interface characterization of the dilution zone-clad zone (IDC) and the dilution zone-heat-affected zone (IDH) was observed with a scanning electron microscope (SEM). The results show that the microstructure of a cross-section has stratification characterization, and consists of the clad zone (CZ), the dilution zone (DZ), the diffusion layer (DL) and the heat-affected zone (HAZ). The layer-by-layer microstructure results from the boundary layer phenomenon of viscous melt-fluid and diffusion. The kind of reinforced particle has an effect on the interface morphology, microstructure and flow characterization of the melt-fluid. The phase constitution in the clad zone consists of(Cr–Ni–Fe),TiC,Ni4B3,Ti2Ni,Cr2BandM23C6forTiC+NiCrBSicoating, and(Cr–Ni–Fe),TiN,NiB,Cr2TiandTi2NiforTiN+NiCrBSicoating. The interfaces of the IDC in theNiCrBSi-clad layer is clear and clean; those ofTiC+NiCrBSiandTiN+NiCrBSiare illegible.Ti–Niphases with acicular microstructure link dilution zone and clad zone, and two kinds of phase with acicular microstructure, are similar in composition and shape.

Suggested Citation

  • Rongxiang Liu & Tingquan Lei & Lixin Guo, 2004. "STRATIFICATION MECHANISM AND INTERFACE CHARACTERIZATION OF(TiN),(TiC)/NiCrBSiCOMPOSITE COATINGS SYNTHESIZED BY LASER REMELTING," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 11(03), pages 291-295.
    • Handle: RePEc:wsi:srlxxx:v:11:y:2004:i:03:n:s0218625x04006190
    DOI: 10.1142/S0218625X04006190
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