Determination of processing-induced stresses and properties of layered and graded coatings: Experimental method and results for plasma-sprayed NiAl2O3

Kesler, Olivera; Finot, M.; Suresh, S.; Sampath, Sanjay

doi:10.1016/s1359-6454(97)00015-3

Cited by 65 publications

(21 citation statements)

References 20 publications

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“…If the crack-face contact and friction were taken into account, the incumbent problem would become highly nonlinear and more complicated. In consideration of the processing-induced internal stress gradients, however, that may be residing inside the coated medium (Kesler et al 1997) and within the context of linear elasticity, the effect of any pre-existing residual stresses can be superimposed on the present solutions. The negative values of K I in this study can then be applicable when the superposition with uncoupled solutions due to the large enough residual and/or other external tensile stresses gives rise to the positive resultant K I and thus keeps the crack open at any load.…”

Section: Resultsmentioning

confidence: 99%

Interfacial cracking in a graded coating/substrate system loaded by a frictional sliding flat punch

Choi

Paulino

2009

Proc. R. Soc. A.

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An analysis of a coupled plane elasticity problem of crack/contact mechanics for a coating/substrate system with functionally graded properties is performed, where the rigid flat punch slides over the surface of the coated system that contains a crack. The graded material is treated as a non-homogeneous interlayer between dissimilar, homogeneous phases of the coated medium and the crack is assumed to exist along the interface between the interlayer and the substrate. Based on the Fourier integral transform method and the transfer matrix approach, formulation of the current coupled mixed boundary value problem lends itself to the derivation of a set of three simultaneous Cauchy-type singular integral equations. In the numerical results, the emphasis is placed on the investigation of interactions between the contact stress field and the crack-tip behaviour for various combinations of material, geometric and loading parameters of the coated system. Specifically, effects of interfacial cracking on the distributions of the contact pressure and the in-plane stress component along the coating surface are examined and the mixed-mode stress intensity factors evaluated from the crack-tip stress field with the square-root singularity are provided as a function of punch location. Further addressed is the quantification of the singular character of contact pressure distributions at the trailing and leading edges of the flat punch in terms of the punch-edge stress intensity factors. Implicit in this particular analysis of the coupled crack/contact problem presented henceforth is that the crack closure behaviour under the compressive contact stress field is not taken into account, ignoring the influence of crack-face contact and friction.

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Section: Resultsmentioning

confidence: 99%

Interfacial cracking in a graded coating/substrate system loaded by a frictional sliding flat punch

Choi

Paulino

2009

Proc. R. Soc. A.

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“…The process parameters during deposition may also influence the coating behavior [9] and therefore the knowledge of residual stress profiles allows the optimization of the spraying techniques. Several different techniques have been developed and applied to measure the residual stress of metallic coatings; these include X-ray diffraction (XRD) [13], neutron diffraction [14], layer-by-layer removal [15],hole drilling [16] and in-situ curvature-monitoring technique [17]. However, to date, only a few studies have been conducted to evaluate residual stress on amorphous materials, particularly for AMCs.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

The effect of residual stress on the electrochemical corrosion behavior of Fe-based amorphous coatings in chloride-containing solutions

Wang

Scenini

et al. 2016

Surface and Coatings Technology

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The electrochemical corrosion and passive behavior of activated combustion high-velocity air fuel FeCrMoMnWBCSi amorphous metallic coatings (AMCs) under different geometries that produced a variable tensile residual stresses were investigated in chloride-containing solutions by using electrochemical measurements and X-ray photoelectron spectroscopy. The tensile residual stresses of AMCs were determined by the mechanical method of sharp indentation testing. A systematic detrimental effect of tensile residual stress on passive current density and localized corrosion was found. The detrimental effect of residual stress was aggravated at higher temperatures and acidity. The implication of high donor density on the passive film stability, derived from Mott-Schottky analysis, is also discussed.

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“…Therefore, the P-h curves in the elastic regime are not affected by prior residual stresses. This consideration is important in the context of this work as it is well-known from X-ray and neutron diffraction as well as curvature measurements that large residual stresses (with magnitudes of several hundred MPa) are induced in plasma-sprayed coatings during deposition [12,13]. Thus, it is desirable that the measured value of E not be influenced by such stresses.…”

Section: Elastic Moduli Of Coatingsmentioning

confidence: 99%

Instrumented spherical micro-indentation of plasma-sprayed coatings

Alcalá

Gaudette

Suresh

et al. 2001

Materials Science and Engineering: A

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The mechanical response of plasma-sprayed coatings is studied by recourse to instrumented spherical micro-indentation. It is shown that the elastic moduli of the coatings can be determined in a more reliable and reproducible manner with instrumented spherical indentation than prior (Knoop) indentation methods, while at the same time minimizing damage to the coating during indentation. The results show that the values of the elastic moduli, E, of air plasma-sprayed (APS) materials are much lower than those of vacuum plasma-sprayed (VPS) materials. The VPS deposits are more homogeneous at a microstructural level as splat formation, microcracking and the development of oxide scales are suppressed. Such homogenization increases the value of E to the point where it becomes similar to that of fully dense materials. Larger amounts of inelastic flow occur in APS deposits as compared with VPS deposits. This flow is associated with fracture and sliding of splats.

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Determination of processing-induced stresses and properties of layered and graded coatings: Experimental method and results for plasma-sprayed NiAl2O3

Cited by 65 publications

References 20 publications

Interfacial cracking in a graded coating/substrate system loaded by a frictional sliding flat punch

Interfacial cracking in a graded coating/substrate system loaded by a frictional sliding flat punch

The effect of residual stress on the electrochemical corrosion behavior of Fe-based amorphous coatings in chloride-containing solutions

Instrumented spherical micro-indentation of plasma-sprayed coatings

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