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

Rongxiang Liu (), Tingquan Lei and Lixin Guo
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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

Surface Review and Letters (SRL), 2004, vol. 11, issue 03, 291-295

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.

Keywords: Titanium alloys; coating; interface; mechanism; boundary layer (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X04006190

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