Cracking behaviour of thick composite coatings under scratch testing

Arash Ghabchi, Aino Helle, Marleen Rombouts, Kenneth Holmberg, Kati Rissa, Tommi Varis, Simo Varjus, Toivo Lepistö

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    A set of thermal sprayed and laser cladded WC-metal matrix thick coatings were studied by scratch testing to address the cracking behaviour. Failure mechanisms at different loadings have strong dependency on microstructure and stresses applied by rigid indenter sliding on the coating. Scratch tracks were studied by optical microscope and generated cracks were studied by SEM. In thermal sprayed coatings collapsing of material, formation of angular cracks, semi-circular cracks and delamination of material were observed. For laser cladded coatings due to higher binder content, plastic deformation of binder was dominant failure mechanism. Additionally, cracking of big carbides, carbide-binder interface cracking and limited binder fracture were observed.
    Original languageEnglish
    Title of host publicationProceedings of Nordtrib 2010: 14th Nordic Symposium on Tribology
    Subtitle of host publicationStorforsen, Sweden 8.-11.6.2010
    PublisherLuleå University of Technology
    Number of pages8
    ISBN (Electronic)978-91-7439-124-4
    Publication statusPublished - 2010
    MoE publication typeA4 Article in a conference publication

    Keywords

    • coatings
    • thermal spray
    • laser cladding
    • scratch testing
    • failure mechanism
    • tribology

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