Toughness evaluation of HVOF WC–Co coatings using non-linear regression analysis

Lima, Maria Luísa; Godoy, Cristina; Avelar-Batista, J.C.; Modenesi, Paulo José

doi:10.1016/s0921-5093(03)00204-1

Cited by 72 publications

(31 citation statements)

References 12 publications

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“…These microstructural changes were also studied by mechanical spectroscopy [26]. Depending on the chemical composition of the as-sprayed coating and heat treatment conditions, a replacement of the amorphous phase, metallic W, as well as the non-equilibrium phase W 2 C by the formation of g-phases was observed, e.g., [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

et al. 2017

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The potential to improve the tribomechanical performance of HVOF-sprayed WC-12Co coatings was studied by using aqueous WC-12Co suspensions as feedstock. Both as-sprayed and hot-isostatic-pressed (HIPed) coatings were studied. Mathematical models of wear rate based on the structure property relationships, even for the conventionally sprayed WC-Co hardmetal coatings, are at best based on the semiempirical approach. This paper aims to develop these semiempirical mathematical models for suspension sprayed nanocomposite coatings in as-sprayed and heat-treated (HIPed) conditions. Microstructural evaluations included transmission electron microscopy, X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy. The nanohardness and modulus of the coated specimens were investigated using a diamond Berkovich nanoindenter. Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that the HIPing post-treatment resulted in crystallization of amorphous coating phases and increase in elastic modulus and hardness. Influence of these changes in the wear mechanisms and wear rate is discussed. Results are also compared with conventionally sprayed high-velocity oxy-fuel hardmetal WC-Co coatings.

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Section: Introductionmentioning

confidence: 99%

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

et al. 2017

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“…Various authors have used crack patterns at, and beneath, the surface of indentations to assess the fracture toughness of ceramics (Ref [1][2][3][4][5][6], study the hardness of plasma-sprayed coatings (Ref [7][8][9], and evaluate the residual stress, adhesive strength, and fracture toughness of thermally sprayed high velocity oxygen fuel (HVOF) cermet coatings (Ref [10][11][12][13][14]. However, there has been no work on microfissuring of sprayed HVOF coating materials during the indentation process.…”

Section: Introductionmentioning

confidence: 99%

The Use of Acoustic Emission to Characterize Fracture Behavior During Vickers Indentation of HVOF Thermally Sprayed WC-Co Coatings

et al. 2009

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This paper describes how acoustic emission (AE) measurements can be used to supplement the mechanical information available from an indentation test. It examines the extent to which AE data can be used to replace time-consuming surface crack measurement data for the assessment of fracture toughness of brittle materials. AE is known to be sensitive to fracture events and so it was expected that features derived from the AE data may provide information on the processes (microscale and macroscale fracture events and densification) occurring during indentation. AE data were acquired during indentation tests on samples of a WC-12%Co coating of nominal thickness 300 lm at a variety of indentation loads. The raw AE signals were reduced to three stages and three features per stage, giving nine possible indicators per indentation. Each indicator was compared with the crack profile, measured both conventionally and using a profiling method which gives the total surface crack length around the indent. A selection of the indents was also sectioned in order to make some observations on the subsurface damage. It has been found that reproducible AE signals are generated during indentation involving three distinct stages, associated, respectively, with nonradial cracking, commencement of radial cracking, and continued descent of the indenter. It has been shown that AE can give at least as good a measure of cracking processes during indentation as is possible using crack measurement after indentation.

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“…The micro-hardness of the WC-Co was measured by a Vickers micro-hardness tester (HV-5, Taiming, Shanghai, China) under a load of 300 g for a loading duration of 30 s. The fracture toughness was estimated by diamond pyramid (Vickers) indentation test under a load of 5000 g for a loading duration of 30 s using Niihara's equation corresponding to Pamlqvist type crack [19,[30][31][32]. Ten measurements were carried out for each hardness or toughness.…”

Section: Characterization Of Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Mechanical property and wear performance dependence on processing condition for cold-sprayed WC-(nanoWC-Co)

Yang

Gao

2015

Applied Surface Science

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Toughness evaluation of HVOF WC–Co coatings using non-linear regression analysis

Cited by 72 publications

References 12 publications

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

The Use of Acoustic Emission to Characterize Fracture Behavior During Vickers Indentation of HVOF Thermally Sprayed WC-Co Coatings

Mechanical property and wear performance dependence on processing condition for cold-sprayed WC-(nanoWC-Co)

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