Microstructural characterization of Co-based coating deposited by low power pulse laser cladding

A. Farnia, F. Malek Ghaini*, V. Ocelik, J. Th. M. De Hosson

*Bijbehorende auteur voor dit werk

    OnderzoeksoutputAcademicpeer review

    38 Citaten (Scopus)
    36 Downloads (Pure)

    Samenvatting

    A detailed microstructural study of Stellite 6 coating deposited on a low carbon ferritic steel substrate using preplaced powder method and low power Nd:YAG pulse laser is performed. The grain structure and solidification texture of the coating are investigated by orientation imaging microscopy (OIM) and scanning electron microscopy. In addition, the effect of consecutive pulses on the microstructure of the coating is examined. The orientation relationship (OR) at coating/substrate interface and the solid state phase transformation in heat-affected zone are studied as well as the Vickers microhardness profile measurement in order to support the microstructural observations. An important conclusion is reached that the shape of solidification front during pulsed laser cladding is similar to the shape of solidification front during continuous cladding with a doubled laser beam scanning speed. Further, OIM reveals the Greninger-Troiano OR between the face centered cubic coating and bcc substrate grains. It is concluded that at the moment of solidification epitaxial growth of the grains in the coating occur on the austenitic grains of the substrate and that an austenite-ferrite transformation occurs in the heat-affected zone upon subsequent cooling.

    Originele taal-2English
    Pagina's (van-tot)2714-2723
    Aantal pagina's10
    TijdschriftJournal of Materials Science
    Volume48
    Nummer van het tijdschrift6
    DOI's
    StatusPublished - mrt.-2013

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