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

Fingerprint

Composite coatings
Binders
Testing
Cracks
Coatings
Carbides
Sprayed coatings
Lasers
Delamination
Plastic deformation
Microscopes
Microstructure
Scanning electron microscopy
Metals
Hot Temperature

Keywords

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

Cite this

Ghabchi, A., Helle, A., Rombouts, M., Holmberg, K., Rissa, K., Varis, T., ... 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.
Ghabchi, Arash ; Helle, Aino ; Rombouts, Marleen ; Holmberg, Kenneth ; Rissa, Kati ; Varis, Tommi ; Varjus, Simo ; Lepistö, Toivo. / Cracking behaviour of thick composite coatings under scratch testing. Proceedings of Nordtrib 2010: 14th Nordic Symposium on Tribology: Storforsen, Sweden 8.-11.6.2010. Luleå University of Technology, 2010.
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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.",
keywords = "coatings, thermal spray, laser cladding, scratch testing, failure mechanism, tribology",
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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.

Cracking behaviour of thick composite coatings under scratch testing. / Ghabchi, Arash; Helle, Aino; Rombouts, Marleen; Holmberg, Kenneth; Rissa, Kati; Varis, Tommi; Varjus, Simo; Lepistö, Toivo.

Proceedings of Nordtrib 2010: 14th Nordic Symposium on Tribology: Storforsen, Sweden 8.-11.6.2010. Luleå University of Technology, 2010.

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

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T1 - Cracking behaviour of thick composite coatings under scratch testing

AU - Ghabchi, Arash

AU - Helle, Aino

AU - Rombouts, Marleen

AU - Holmberg, Kenneth

AU - Rissa, Kati

AU - Varis, Tommi

AU - Varjus, Simo

AU - Lepistö, Toivo

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N2 - 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.

AB - 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.

KW - coatings

KW - thermal spray

KW - laser cladding

KW - scratch testing

KW - failure mechanism

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ER -

Ghabchi A, Helle A, Rombouts M, Holmberg K, Rissa K, Varis T et al. 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. 2010