Microstructural characterization of vanadium carbide laser clad coatings
1998; Elsevier BV; Volume: 108-109; Linguagem: Inglês
10.1016/s0257-8972(98)00662-8
ISSN1879-3347
AutoresYiad Aurelia Cruces Herrera, I.C. Grigorescu, José Martin Herrera Ramirez, C Di Rauso, M.H. Staia,
Tópico(s)High-Temperature Coating Behaviors
ResumoThe microstructure of VC laser clad coatings on AISI 1045 steel substrate has been investigated by X-ray diffraction (XRD), optical and scanning electron microscopy (SEM), X-ray energy dispersive (EDS) and X-ray photoelectron spectroscopy (XPS), respectively. The crystalline structure is formed by an α-Fe matrix with dispersed cubic VCx carbides, mainly V8C7 and V4C3, which were probably produced by the partial dissolution of the VC in the melt during cladding and its subsequent precipitation. It can be concluded that a substantial mass transfer occurs across the carbide–matrix interface: the content of vanadium dissolved in the α-Fe matrix has been found to be between 11 to 23 wt.%, whereas the amount of substitutional iron in V8C7 carbides reaches 50 wt.%. Traces of vanadium oxides have been also detected at and beneath the surface of the clad layer.
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