Residual Stress Measurement in Coated Plates Using Layer Growing/ Removing Methods: 100&lt;sup&gt;Th&lt;/sup&gt; Anniversary of the Publication of Stoney’s Paper “the Tension of Metallic Films Deposited by Electrolysis”

Kõo, Jakub; Valgur, Jaak

doi:10.4028/www.scientific.net/msf.681.165

Cited by 6 publications

(7 citation statements)

References 8 publications

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“…From the deflection of the plate, residual stresses were determined using an equation that was based on Stoney's formula [17], but appropriately modified for a plate substrate by introducing the factor 1/(1 − µ 1 ) to account for the biaxial state of stress [12]:…”

Section: Methodsmentioning

confidence: 99%

Residual Stresses on Various PVD Hard Coatings on Tube and Plate Substrates

et al. 2020

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In this study, the average residual stresses were determined in hard PVD nACRo (nc-AlCrN/a-Si3N4), nACo (nc-AlTiN/a-Si3N4), AlCrN, TiAlN, and TiCN commercial coatings through the deflection of the plate substrates and the simultaneous measurement of length variation in thin-walled tubular substrates. The length measuring unit was used for the measurement of any length change in the tubular substrate. A change in tube length was reduced to the deflection of the middle cross-section of the elastic element for which deformation was measured using four strain gauges. The cross-sectional microstructure and thickness of the coatings were investigated by means of scanning electron microscopy (SEM), and a determination was made of the chemical composition of the coatings and substrate by means of energy dispersive X-ray spectroscopy (EDS). The values of average compressive residual stresses, as determined by both methods, were very high (with a variation of between 2.05 and 6.63 GPa), irrespective of coating thickness, but were dependent upon the shape of the substrate and on its position in relation to the axis of the rotating cathode. The thicknesses of the coatings that were deposited on the plates with two parallel fixings (such as the nACRo coatings on the front surface at 6.8 μm and on the rear surface at 2.9 μm) and on the tubular substrates (10.0 μm) were significantly different. The higher average compressive residual stresses in the coating correlate to the higher average relative wear resistance that was obtained during field wear testing.

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Section: Methodsmentioning

confidence: 99%

Residual Stresses on Various PVD Hard Coatings on Tube and Plate Substrates

et al. 2020

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“…1b) are only deposited from one side and should be placed gripped with a claw in the fixing device made of carbon steel [3]. Depending on the deflection of the plate, modified Stoney's formula will account for biaxial stresses [6]. In order to prevent deposition of the coating on the cross-section of the tube ends, they were closed by the nozzle (Fig.…”

Section: Evaluation Of Residual Stresses In the Coatingmentioning

confidence: 99%

Evaluation of Residual Stresses in PVD Coatings by means of Tubular Substrate Length Variation

Peetsalu

Kübarsepp

Mikli

et al. 2018

Materials Research Proceedings

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“…Also the conventional curvature method was used where a plate served as the substrate (Fig. 1) [9][10][11].…”

Section: Evaluation Of Residual Stresses In Coatingmentioning

confidence: 99%

“…Therefore, accurate measurement and prediction of residual stresses are crucial in manufacturing PVD hard coatings. There are various possible methods for determination of residual stresses in PVD coatings including deformation methods [6,[9][10][11][12]. The aim of the study was to determine residual stresses through measurement of the longitudinal deformations of strip substrates.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Residual Stresses in PVD Coatings by Means of Strip Substrate Length Variation and Curvature Method of Plate Substrate

Ryabchikov

Kõo

Adoberg

et al. 2017

SSP

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The aim of the study was to determine macroscopic residual stresses in Physical Vapor Deposits (PVD) coatings through measurement of the length variation of the strip substrates coated on both sides. The length change of the strip was reduced to the deflection of the middle cross-section of the elastic element and was recorded by four strain gauges. For validating the obtained results, the conventional curvature method was used. As an application, residual stresses in hard AlCrN PVD coatings were investigated. The coatings were nanolayered to achieve better coating toughness for blanking and punching applications. The steel strips and steel plates with two thicknesses were used as the substrate. The values of the compressive residual stresses, determined by both methods for the investigated coatings, were very high (3.3 -3.6 GPa) independent of coating thickness and practically equal within the measurement uncertainty of the method. Good agreement between the experimental results obtained with both methods suggests that the presented method, strip length variation, is applicable for determination of residual stresses in coatings. Compressive stresses in coatings are desirable as they strengthen the coating.

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Residual Stress Measurement in Coated Plates Using Layer Growing/ Removing Methods: 100<sup>Th</sup> Anniversary of the Publication of Stoney’s Paper “the Tension of Metallic Films Deposited by Electrolysis”

Cited by 6 publications

References 8 publications

Residual Stresses on Various PVD Hard Coatings on Tube and Plate Substrates

Residual Stresses on Various PVD Hard Coatings on Tube and Plate Substrates

Evaluation of Residual Stresses in PVD Coatings by means of Tubular Substrate Length Variation

Evaluation of Residual Stresses in PVD Coatings by Means of Strip Substrate Length Variation and Curvature Method of Plate Substrate

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