Small scale fracture behaviour of multilayer TiN/CrN systems: Assessment of bilayer thickness effects by means of ex-situ tests on FIB-milled micro-cantilevers

Roa, J.J.; Rodriguez, R.I.; Lamelas, V.; Martı́nez, R.; Jiménez‐Piqué, E.; Llanes, L.

doi:10.1016/j.surfcoat.2016.06.093

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…Microcantilever bending and micropillar splitting methods have been used for investigating fracture behaviour of brittle materials and coatings at small scales. Regarding the former, with the flexibility of FIB instruments enabling a variety of possible testing setups, many different cantilever geometries have been reported in literature [22][23][24][25][26][27]. During cantilever bending (induced through loading applied by means of a diamond tip within a nanoindenter unit), cleavage and instantaneous cracking may occur for many brittle materials, enabling then the measurement of K Ic .…”

Section: Introductionmentioning

confidence: 99%

Measuring the fracture toughness of single WC grains of cemented carbides by means of microcantilever bending and micropillar splitting

Ortiz-Membrado

Cuadrado

Casellas

et al. 2021

International Journal of Refractory Metals and Hard Materials

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Section: Introductionmentioning

confidence: 99%

Measuring the fracture toughness of single WC grains of cemented carbides by means of microcantilever bending and micropillar splitting

Ortiz-Membrado

Cuadrado

Casellas

et al. 2021

International Journal of Refractory Metals and Hard Materials

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“…Hence, when multilayer coatings deform as a beam, surface cracks induced by high bending tensile stress represent different growth paths. Previous studies on the fracture investigations on the free-standing multilayer coatings, prepared as a single cantilever beam and subjected to bending loads, reveal improved fracture toughness for coatings with superlattice structures [16,17,43].…”

Section: Fracture Investigationmentioning

confidence: 95%

Deformation and Cracking Mechanism in CrN/TiN Multilayer Coatings

et al. 2019

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In this study, the effects of the microstructural properties on the deformation and damage mechanism of CrN/TiN multilayer coatings deposited on Custom 450 steel using the unbalanced reactive magnetron sputtering PVD process were studied. All coatings were fabricated with an overall thickness of 1.5 µm, but different bilayer periods (Λ). Structural and mechanical properties of coatings were investigated by XRD analysis and nanoindentation experiment, respectively. Indentation tests at three loads of 100, 300, and 450 mN were performed on the coatings’ surface and then, cross-sections of fractured imprints were analyzed with SEM and TEM. Measuring the length of the cracks induced by indentation loads and analyzing the load-displacement curves, apparent fracture energy values of multilayer coatings were calculated. We observed that multilayer systems with bilayer periods of 4.5–15 nm possess superlattice structure, which also results in higher values for Young’s modulus and hardness as well as higher fracture energy. Comparison of cross-sectional SEM and TEM observations showed that coatings with smaller bilayer periods tend to deform by shear sliding mechanism due to the existence of the long-grown columns, while short dispersed grains—growing in the coatings with a larger bilayer period—led to deformation via local grain boundary sliding and grain rotation.

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“…bilayer coating formed on high-speed steel by physical vapor deposition was presented by J.J. Roa et al [23]. Chromium-based coatings may also be composed of additional elements like aluminum and/or silica.…”

Section: Chromium-based Layersmentioning

confidence: 99%

The structure and formation of functional hard coatings: a short review

Diciuc

Kazek-Kęsik

2017

MATEC Web Conf.

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Abstract. Turning tools come in different shapes and sizes, geometry, base material and coating, according to their destination. They are widely used both for obtaining parts and for machinability tests. In this paper a short review about high-speed steel (HSS) turning tools and their coatings is presented. Hard coatings formed on the tool material should be functional depending on the tool final application. Requirements for hard coatings and technological problems for layer formation on the real cutting tool are discussed. Techniques and production of hard coatingsIn a statistical study made for the year 2013 [1] the 16.33 billion US-Dollars estimated industry of cutting tools includes 39% milling tools followed by 30% of turning tools, with an annual growth assumed to be 4-5%. The same study shows that in 53% of the cases, the cutting tool substrate is represented by cemented carbide and in 20% of the cases by highspeed steel (HSS).Coatings on cutting tools are widely spread due to the improvement they provide during the cutting process. In the early 2000's made statistic 50% of HSS tools, 85% of carbide tools and 40% of super-hard tools used in industry were coated [2]. Due to the more complex phenomenology which accompanies the intermittent cutting process, in this study only coatings of HSS turning tools will be treated.The use of coatings is expected to yield a better protection of the tool against abrasion and adhesion, diffusion, oxidation and to produce a heat barrier for the intensive heat flowing from the cutting area into the tool material [3], thus increasing productivity and tool's life. However, regarding the heat insulation the opinions are divided, as in the paper [4] it was proven that the coatings of continuous cutting tools are not able to insulate the substrate.Mainly, depending on the method and the coating structure, the same coatings can be applied to both HSS and carbide tools, each substrate having its advantages and disadvantages according to the cutting application. The properties of the tools surface should be improved according their novelty, application and to achieve higher productivity for the manufacturing process. Depending on the turning tools destination various hard coatings can be formed on its surface. The shape of the turning tool is usually not complicated, thus techniques like physical or chemical vapor deposition for layer formation are applied. Hard *

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Small scale fracture behaviour of multilayer TiN/CrN systems: Assessment of bilayer thickness effects by means of ex-situ tests on FIB-milled micro-cantilevers

Cited by 7 publications

References 27 publications

Measuring the fracture toughness of single WC grains of cemented carbides by means of microcantilever bending and micropillar splitting

Measuring the fracture toughness of single WC grains of cemented carbides by means of microcantilever bending and micropillar splitting

Deformation and Cracking Mechanism in CrN/TiN Multilayer Coatings

The structure and formation of functional hard coatings: a short review

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