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.
|Title of host publication||Proceedings of Nordtrib 2010: 14th Nordic Symposium on Tribology|
|Subtitle of host publication||Storforsen, Sweden 8.-11.6.2010|
|Publisher||Luleå University of Technology|
|Number of pages||8|
|Publication status||Published - 2010|
|MoE publication type||A4 Article in a conference publication|
- thermal spray
- laser cladding
- scratch testing
- failure mechanism
Ghabchi, A., Helle, A., Rombouts, M., Holmberg, K., Rissa, K., Varis, T., Varjus, S., & Lepistö, T. (2010). Cracking behaviour of thick composite coatings under scratch testing. In Proceedings of Nordtrib 2010: 14th Nordic Symposium on Tribology: Storforsen, Sweden 8.-11.6.2010 Luleå University of Technology.