Properties and Performance of Hard Coatings on Tool Steels under Cyclic Indentation

Sivitski, Alina; Gregor, Andre; Saarna, Mart; Kulu, Priit; Sergejev, Fjodor

doi:10.2478/v10147-010-0050-0

Cited by 5 publications

(7 citation statements)

References 15 publications

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“…According to Bhowmick et al , 36 the edge cracks are the result of stretching of top membrane of the coating influenced by plastic deformation of the substrate as well as additional bending effects on the surface layer at the edge of the indentation impression. It is reported by Sivitski et al , 20 that the brittle coatings (nanocomposite) fail in tensile driven cracking mode while the tougher coatings (TiN) would fail in quasi-plastic or shear cracking mode, which support the present findings.…”

Section: Semsupporting

confidence: 91%

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Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coating during nanoimpact test

Ravi

Markandeya

Joshi

2017

Surface Engineering

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Cyclic nanoimpact tests were carried on nc-TiAlN/a-Si 3 N 4 nanocomposite, TiN and multilayered TiN/nanocomposite (NC) coatings to evaluate their resistance to fracture under cyclic impact loads. Fracture behaviour of the coatings was ascertained from fracture probability obtained from time-depth curves and focus ion beam milling images of resulting indentation impressions. TiN coating mainly showed intercolumnar cracks while the other coatings showed other modes of cracking, that is, lateral, inclined, bending, edge cracks, during testing. The performance ranking of the coatings, TiN > TiN/NC > nc-TiAlN/a-Si 3 N 4 , is linked to their β 0 value, representing relative indentation depth of the coating-substrate composite hardness system at which the fractional hardness improvement equal to 50% of the maximum is retained and also their corresponding microstructure. Apart from enabling prediction of fracture resistance of the coatings, these studies provide useful insights into design and selection of coating materials for targeted machining applications.

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Section: Semsupporting

confidence: 91%

“…It has been observed 20 that TiN with higher E / H ratio performs better during cyclic indentation tests than nc-TiAlN/a-Si 3 N 4 nanocomposite with lower E / H ratio. On the contrary, a reverse trend was reported by Chen et al 21 for coatings with similar chemistry during cyclic nanoimpact tests.…”

Section: Introductionmentioning

confidence: 99%

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coating during nanoimpact test

Ravi

Markandeya

Joshi

2017

Surface Engineering

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“…The same tendencies can be seen in the indentational response of the coating systems being studied, along with impact wear and indentation surface fatigue behavior [25][26][27]. The nACo and nACRo coatings reveal lower coating failed area ratios (FR, %) when they are compared to TiCN, at a level of 24-42% for 10 3 and 5 × 10 6 for the of impact figures, respectively [27].…”

Section: Discussionsupporting

confidence: 52%

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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“…According to them, crystalline films are more brittle than the amorphous films. In converse, Sivitski et al [33] have reported that TiN has performed better than the nanocomposite coating during nanoindentation tests. Argon [34] report that, during plastic deformation in nanocrystalline or amorphous materials, localised shear transformations takes place within a few nanometers range at low strain rates (typical of nanoindentation) while at high strain rates (typical of cyclic nanoimpact test), catastrophic growth of micro- and nano-cracks lead to their brittle fracture.…”

Section: Resultsmentioning

confidence: 99%

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coatings under cyclic nano impact testing

Babu

Venkatesh

Rao

et al. 2019

Surface Engineering

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TiN, nanocomposite nc-TiAlN/a-Si 3 N 4 (NC) and multi-layered TiN/NC coatings were deposited on commercially used tungsten carbide-cobalt (WC-Co) based tool material substrates by cathodic arc physical vapour deposition (CA-PVD) technique. The coatings were subjected to cyclic nanoimpact testing with impact loads of 1 and 5 mN. Properties such as fracture probability, (h 1 -h s )/(h f -h 1 ) index and crack morphologies were analysed based on which, the performance order of the coatings was evaluated. It was observed that the multi-layer coating performed better followed by monolithic titanium nitride and nanocomposite coating (TiN/NC > TiN > NC). The order of the coatings so obtained was further compared with their relative performance during real-time machining studies. It was observed during machining that the order was changed to TiN/NC > NC > TiN. The better performance in TiN/ NC coating was due to arresting of cracks formed in NC layer by TiN layer.

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Properties and Performance of Hard Coatings on Tool Steels under Cyclic Indentation

Cited by 5 publications

References 15 publications

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coating during nanoimpact test

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coating during nanoimpact test

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

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coatings under cyclic nano impact testing

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Properties and Performance of Hard Coatings on Tool Steels under Cyclic Indentation

Cited by 5 publications

References 15 publications

Fracture behaviour of nc-TiAlN/a-Si3N4 nanocomposite coating during nanoimpact test

Fracture behaviour of nc-TiAlN/a-Si3N4 nanocomposite coating during nanoimpact test

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

Fracture behaviour of nc-TiAlN/a-Si3N4 nanocomposite coatings under cyclic nano impact testing

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Product

Resources

About

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coating during nanoimpact test

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coating during nanoimpact test

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coatings under cyclic nano impact testing