Damage mechanisms and cracking behavior of thermal sprayed WC-CoCr coating under scratch testing

A Ghabchi (Corresponding Author), S Sampath, Kenneth Holmberg, Tommi Varis

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)

Abstract

Evaluation of wear mechanisms of thick thermal sprayed cermet coatings is a challenging endeavor given the numerous process-induced structural and chemical changes as well as presence of residual stresses. In an effort to understand the damage processes under contact load and their sensitivity to the process induced microstructural attributes, controlled scratch testing was used. Detailed assessment of the resultant damage zone provided repeatable cracking patterns that are categorized as (i) Localized collapsing of material, (ii) angular cracks, (iii) primary semi-circular and developed semi-circular cracks and (iv) splat delamination. A correlation was established by linking observed damage mechanisms to the process induced microstructural descriptions including role of spray particle conditions and residual stresses. Quantitative correlations between delamination load for cracking and the process induced variable including particle properties as described by the non-dimensional melting index concept as well as residual stresses were established. Melting index captures the combined effect of particles[U+05F3] thermal and kinetic history and thus coating porosity and the process induced decarburization. The results highlight the critical role of coating density and stress evolution during the coating formation. The research points to scratch testing as a powerful evaluation method to characterize contact response of thick thermal spray cermet coatings including operative mechanisms
Original languageEnglish
Pages (from-to)97-105
JournalWear
Volume313
Issue number1-2
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Cermet Cements
damage
residual stress
coatings
Residual stresses
Coatings
Testing
Delamination
sprayers
Melting
cracks
melting
contact loads
decarburization
Cracks
Decarburization
sprayed coatings
Sprayed coatings
evaluation
Loads (forces)

Keywords

  • Damage mechanism
  • scratch test
  • sliding wear
  • thermal spray coating

Cite this

Ghabchi, A ; Sampath, S ; Holmberg, Kenneth ; Varis, Tommi. / Damage mechanisms and cracking behavior of thermal sprayed WC-CoCr coating under scratch testing. In: Wear. 2014 ; Vol. 313, No. 1-2. pp. 97-105.
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Damage mechanisms and cracking behavior of thermal sprayed WC-CoCr coating under scratch testing. / Ghabchi, A (Corresponding Author); Sampath, S; Holmberg, Kenneth; Varis, Tommi.

In: Wear, Vol. 313, No. 1-2, 2014, p. 97-105.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Damage mechanisms and cracking behavior of thermal sprayed WC-CoCr coating under scratch testing

AU - Ghabchi, A

AU - Sampath, S

AU - Holmberg, Kenneth

AU - Varis, Tommi

PY - 2014

Y1 - 2014

N2 - Evaluation of wear mechanisms of thick thermal sprayed cermet coatings is a challenging endeavor given the numerous process-induced structural and chemical changes as well as presence of residual stresses. In an effort to understand the damage processes under contact load and their sensitivity to the process induced microstructural attributes, controlled scratch testing was used. Detailed assessment of the resultant damage zone provided repeatable cracking patterns that are categorized as (i) Localized collapsing of material, (ii) angular cracks, (iii) primary semi-circular and developed semi-circular cracks and (iv) splat delamination. A correlation was established by linking observed damage mechanisms to the process induced microstructural descriptions including role of spray particle conditions and residual stresses. Quantitative correlations between delamination load for cracking and the process induced variable including particle properties as described by the non-dimensional melting index concept as well as residual stresses were established. Melting index captures the combined effect of particles[U+05F3] thermal and kinetic history and thus coating porosity and the process induced decarburization. The results highlight the critical role of coating density and stress evolution during the coating formation. The research points to scratch testing as a powerful evaluation method to characterize contact response of thick thermal spray cermet coatings including operative mechanisms

AB - Evaluation of wear mechanisms of thick thermal sprayed cermet coatings is a challenging endeavor given the numerous process-induced structural and chemical changes as well as presence of residual stresses. In an effort to understand the damage processes under contact load and their sensitivity to the process induced microstructural attributes, controlled scratch testing was used. Detailed assessment of the resultant damage zone provided repeatable cracking patterns that are categorized as (i) Localized collapsing of material, (ii) angular cracks, (iii) primary semi-circular and developed semi-circular cracks and (iv) splat delamination. A correlation was established by linking observed damage mechanisms to the process induced microstructural descriptions including role of spray particle conditions and residual stresses. Quantitative correlations between delamination load for cracking and the process induced variable including particle properties as described by the non-dimensional melting index concept as well as residual stresses were established. Melting index captures the combined effect of particles[U+05F3] thermal and kinetic history and thus coating porosity and the process induced decarburization. The results highlight the critical role of coating density and stress evolution during the coating formation. The research points to scratch testing as a powerful evaluation method to characterize contact response of thick thermal spray cermet coatings including operative mechanisms

KW - Damage mechanism

KW - scratch test

KW - sliding wear

KW - thermal spray coating

U2 - 10.1016/j.wear.2014.02.017

DO - 10.1016/j.wear.2014.02.017

M3 - Article

VL - 313

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EP - 105

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SN - 0043-1648

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