Residual stresses in structures coated by a high velocity oxy-fuel technique

Hashmi, M.S.J.; Pappalettere, Carmine; Ventola, Fabrizio

doi:10.1016/s0924-0136(97)00295-1

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…The bond strength of the coating is mainly changed as a result of residual stresses generated in deposition process (Ref [16][17][18][19]. The residual stresses are caused by shrinkage of the particles sprayed after solidification (primary cooling process) or differences between the thermal expansion coefficients of the coating and of the substrate (secondary cooling process).…”

Section: Discussionmentioning

confidence: 99%

Bond Strength of Multicomponent White Cast Iron Coatings Applied by HVOF Thermal Spray Process

et al. 2009

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Multicomponent white cast iron is a new alloy that belongs to system Fe-C-Cr-W-Mo-V, and because of its excellent wear resistance it is used in the manufacture of hot rolling mills rolls. To date, this alloy has been processed by casting, powder metallurgy, and spray forming. The high-velocity oxyfuel process is now also considered for the manufacture of components with this alloy. The effects of substrate, preheating temperature, and coating thickness on bond strength of coatings have been determined. Substrates of AISI 1020 steel and of cast iron with preheating of 150°C and at room temperature were used to apply coatings with 200 and 400 lm nominal thickness. The bond strength of coatings was measured with the pull-off test method and the failure mode by scanning electron microscopic analysis. Coatings with thickness of 200 lm and applied on substrates of AISI 1020 steel with preheating presented bond strength of 87 ± 4 MPa.

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Section: Discussionmentioning

confidence: 99%

Bond Strength of Multicomponent White Cast Iron Coatings Applied by HVOF Thermal Spray Process

et al. 2009

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“…In destructive tests, the thermal spray coating is subjected to strain release as a result of material removal. The measurement of change in the stressed coating microstructure can be performed by means of (i) conventional, physically attached strain gauges, 196,197 (ii) XRD, 68 or (iii) optical displacement measurements. 198,199 The destructive techniques are unable to differentiate the source of the induced stress.…”

Section: Thermal Spray Coating Testing Methodsmentioning

confidence: 99%

“…It is possible to calculate the strain state by means of an analytical model. 197 However, since thermal spray coatings display nonuniform through-thickness residual stresses, it is recommended to measure the stress profile through the coating. Therefore, the technique can be modified to perform incremental hole drilling.…”

Section: Destructive Methodsmentioning

confidence: 99%

A review of testing methods for thermal spray coatings

Ang

Berndt

2014

International Materials Reviews

165

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The primary focus of this review concerns the test methods used to evaluate thermal spray coatings. Techniques to measure coating intrinsic properties such as (i) porosity and (ii) residual stress state; as well as extrinsic mechanical properties that include (iii) hardness, (iv) adhesion, (v) elastic modulus, (vi) fracture toughness, and (vi) the Poisson's ratio of thermal spray coatings are presented. This review also encompasses the feedstock and thermal spray method since process variants create a specific microstructure. An important aspect of this work is to highlight the extrinsic nature of mechanical property measurements with regard to thermal spray coatings. Thermal spray coatings exhibit anisotropic behaviour and microstructural artefacts such as porosity and the splat structure of coatings influence the mechanical characterisation methods. The analysis of coating data variability evolving from the different measurement techniques is of particular relevance to interpret the character of thermal spray deposits. Many materials can be thermal sprayed but this review focuses on alumina and partially stabilised zirconia since (i) these materials have many proven applications, and (ii) there is a wealth of information that has been reported on these ceramics.

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“…[4][5][6][7][8][9] However, the through-thickness residual stress distribution is rarely reported. 10) One of the authors applied the concept of the estimation method for residual stress using the inherent strain distribution to the thermal sprayed materials and found that this method is very effective to estimate residual stress distribution in thermal sprayed coatings.…”

Section: )mentioning

confidence: 99%

Residual Stress Distribution in Thermally Sprayed Self-Fluxing Alloy Coatings

2005

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The self-fluxing alloy was thermal sprayed by using combustion flame spraying (FS) and high energy plasma spraying (HPS) as well as high velocity oxy-fuel spraying (HVOF) processes under different combustion chamber pressures of 0.56, 0.70 and 0.84 MPa. As-sprayed HVOF (0.56 MPa) coating contained a large amount of non-melted particles. Whereas, the as-sprayed HVOF (0.70 MPa) and (0.84 MPa) coatings were composed of melted and non-melted particles similar to the FS and HPS coatings. The compressive residual stress distributed through-thickness in the as-sprayed HVOF (0.56 MPa) coating. On the other hand, the tensile residual stress distributed through-thickness in the HVOF (0.70 MPa) and (0.84 MPa) coatings as well as the FS and HPS coatings. However, the through-thickness residual stress distribution of the HVOF coatings exhibited a low value under 100 MPa in the whole area of coating.

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Residual stresses in structures coated by a high velocity oxy-fuel technique

Cited by 8 publications

References 1 publication

Bond Strength of Multicomponent White Cast Iron Coatings Applied by HVOF Thermal Spray Process

Bond Strength of Multicomponent White Cast Iron Coatings Applied by HVOF Thermal Spray Process

A review of testing methods for thermal spray coatings

Residual Stress Distribution in Thermally Sprayed Self-Fluxing Alloy Coatings

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