Formation Mechanisms, Structure, and Properties of HVOF-Sprayed WC-CoCr Coatings: An Approach Toward Process Maps

Tommi Varis (Corresponding Author), Tomi Suhonen, A. Ghabchi, A. Valarezo, S. Sampath, X. Liu, S.-P. Hannula

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

Our study focuses on understanding the damage tolerance and performance reliability of WC-CoCr coatings. In this paper, the formation of HVOF-sprayed tungsten carbide-based cermet coatings is studied through an integrated strategy: First-order process maps are created by using online-diagnostics to assess particle states in relation to process conditions. Coating properties such as hardness, wear resistance, elastic modulus, residual stress, and fracture toughness are discussed with a goal to establish a linkage between properties and particle characteristics via second-order process maps. A strong influence of particle state on the mechanical properties, wear resistance, and residual stress stage of the coating was observed. Within the used processing window (particle temperature ranged from 1687 to 1831 °C and particle velocity from 577 to 621 m/s), the coating hardness varied from 1021 to 1507 HV and modulus from 257 to 322 GPa. The variation in coating mechanical state is suggested to relate to the microstructural changes arising from carbide dissolution, which affects the properties of the matrix and, on the other hand, cohesive properties of the lamella. The complete tracking of the coating particle state and its linking to mechanical properties and residual stresses enables coating design with desired properties.
Original languageEnglish
Pages (from-to)1009-1018
Number of pages10
JournalJournal of Thermal Spray Technology
Volume23
Issue number6
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

coatings
Coatings
residual stress
Residual stresses
wear resistance
Wear resistance
hardness
Cermet Cements
mechanical properties
Hardness
tungsten carbides
Mechanical properties
Damage tolerance
lamella
fracture strength
Tungsten carbide
linkages
carbides
coating
modulus of elasticity

Keywords

  • coatings
  • fracture toughness
  • HVOF
  • process maps
  • residual stress
  • ProperTune

Cite this

Varis, Tommi ; Suhonen, Tomi ; Ghabchi, A. ; Valarezo, A. ; Sampath, S. ; Liu, X. ; Hannula, S.-P. / Formation Mechanisms, Structure, and Properties of HVOF-Sprayed WC-CoCr Coatings : An Approach Toward Process Maps. In: Journal of Thermal Spray Technology. 2014 ; Vol. 23, No. 6. pp. 1009-1018.
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abstract = "Our study focuses on understanding the damage tolerance and performance reliability of WC-CoCr coatings. In this paper, the formation of HVOF-sprayed tungsten carbide-based cermet coatings is studied through an integrated strategy: First-order process maps are created by using online-diagnostics to assess particle states in relation to process conditions. Coating properties such as hardness, wear resistance, elastic modulus, residual stress, and fracture toughness are discussed with a goal to establish a linkage between properties and particle characteristics via second-order process maps. A strong influence of particle state on the mechanical properties, wear resistance, and residual stress stage of the coating was observed. Within the used processing window (particle temperature ranged from 1687 to 1831 °C and particle velocity from 577 to 621 m/s), the coating hardness varied from 1021 to 1507 HV and modulus from 257 to 322 GPa. The variation in coating mechanical state is suggested to relate to the microstructural changes arising from carbide dissolution, which affects the properties of the matrix and, on the other hand, cohesive properties of the lamella. The complete tracking of the coating particle state and its linking to mechanical properties and residual stresses enables coating design with desired properties.",
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Formation Mechanisms, Structure, and Properties of HVOF-Sprayed WC-CoCr Coatings : An Approach Toward Process Maps. / Varis, Tommi (Corresponding Author); Suhonen, Tomi; Ghabchi, A.; Valarezo, A.; Sampath, S.; Liu, X.; Hannula, S.-P.

In: Journal of Thermal Spray Technology, Vol. 23, No. 6, 2014, p. 1009-1018.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Varis, Tommi

AU - Suhonen, Tomi

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AU - Valarezo, A.

AU - Sampath, S.

AU - Liu, X.

AU - Hannula, S.-P.

PY - 2014

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AB - Our study focuses on understanding the damage tolerance and performance reliability of WC-CoCr coatings. In this paper, the formation of HVOF-sprayed tungsten carbide-based cermet coatings is studied through an integrated strategy: First-order process maps are created by using online-diagnostics to assess particle states in relation to process conditions. Coating properties such as hardness, wear resistance, elastic modulus, residual stress, and fracture toughness are discussed with a goal to establish a linkage between properties and particle characteristics via second-order process maps. A strong influence of particle state on the mechanical properties, wear resistance, and residual stress stage of the coating was observed. Within the used processing window (particle temperature ranged from 1687 to 1831 °C and particle velocity from 577 to 621 m/s), the coating hardness varied from 1021 to 1507 HV and modulus from 257 to 322 GPa. The variation in coating mechanical state is suggested to relate to the microstructural changes arising from carbide dissolution, which affects the properties of the matrix and, on the other hand, cohesive properties of the lamella. The complete tracking of the coating particle state and its linking to mechanical properties and residual stresses enables coating design with desired properties.

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