Wear of TiC-coated carbide tools in dry turning

Lim, C.Y.H.; Lim, S.C.; Lee, K.S.

doi:10.1016/s0043-1648(98)00366-4

Cited by 56 publications

(32 citation statements)

References 31 publications

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“…Due to the high loads and high temperature, the crater originates at this position and eventually results in substrate material exposure. The crater wear is often referred to as a combination of chemical wear due to diffusion [42], abrasive wear from the chip sliding [43], and plastic deformation of the coating [44,45], and it depends on work material and cutting parameters. Due to the nature of the crater wear it is also influenced by the coating thickness but in this study the coating thicknesses for the bias-layered coatings are all smaller than the bias monoliths (Table 1).…”

Section: Microstructure and Cutting Propertiesmentioning

confidence: 99%

Improved metal cutting performance with bias-modulated textured Ti0.50Al0.50N multilayers

Norrby

Johansson-Jöesaar

Odén

2014

Surface and Coatings Technology

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Section: Microstructure and Cutting Propertiesmentioning

confidence: 99%

Improved metal cutting performance with bias-modulated textured Ti0.50Al0.50N multilayers

Norrby

Johansson-Jöesaar

Odén

2014

Surface and Coatings Technology

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“…Such maps link the observed wear mechanisms to the actual conditions. These maps demonstrate clearly that transitions from one dominant wear mechanism to another may also be identified by changes in measured wear rates [22]. 4.1.1.…”

Section: Wear Mapsmentioning

confidence: 80%

“…Wear maps can represent the mechanistic changes on the worn surfaces of material and the counterpart over a range of operating conditions [22]. Knowledge of both wear mode and wear mechanisms of the material of the worn surface and counterface is also essential in order to understand the material degradation mechanisms and chemical effects in the contact [17].…”

Section: Wear Mapsmentioning

confidence: 99%

Mapping wear mechanisms of TiC/Ti composite coatings

Rasool

Mridha

Stack

2015

Wear

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In this work, a fundamental study of the wear transition regimes with respect to sliding speed and normal load was carried out for a pin-on-disk sliding couple, involving hardened steel (disks) and titanium base titanium carbide composite coatings (pins). The coating was deposited using a Tungsten Inert Gas (TIG) welding torch melting process. The sliding speed was varied from 0.38 to 1.5m s-1, and the normal load was varied from 10 to 50N. Dry sliding wear behaviour of the disks was characterized by abrasive-oxidative wear at lower normal loads while adhesive-oxidative wear predominated at higher loads with iron oxide transfer to the TiC composite coated pins. In contrast, micro-polishing and adhesive wear predominated for the TiC composite coatings pins along with very mild abrasive wear in evidence. However, the wear regime depended on the conditions with a range of transitions observed over the sliding speeds and loads tested. Wear maps have been constructed to represent the wear mode transitions and the observed wear mechanisms have been discussed.

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“…During cutting, the crater wear gradually evolves with time towards the cutting edge, where the rake and flank face meet, as is illustrated in Figure 29. The origin of the crater wear is dependent on the work material and cutting parameters but is often referred to as a combination of chemical wear from diffusion [149], abrasive wear from the chip sliding [150] and plastic deformation of the coating [151,152]. A direct improvement of the crater wear resistance is also obtained by increasing the thickness of the coatings.…”

Section: Wearmentioning

confidence: 99%

Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures

Norrby¹

2014

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LINKÖPING 2014The cover image shows nine two-dimensional x-ray diffractograms of TiAlN merged into one quarter circle. Going counterclockwise from an as-deposited sample, the parts show different stages of annealing. The color scheme is chosen to represent the motto "Stort hjärta, hårt arbete".Niklas Norrby, unless otherwise stated ISBN: 978-91-7519-372-4 ISSN: 0345-7524 Printed by LiU-Tryck, Linköping, Sweden, 2014 i Abstract A typical hard coating on metal cutting inserts used in for example turning, milling or drilling operations is TiAlN. At elevated temperatures, TiAlN exhibits a well characterized spinodal decomposition into coherent cubic TiN and AlN rich domains, which is followed by a transformation from cubic to hexagonal AlN. Using in-situ synchrotron x-ray radiation, the kinetics of the second transformation was investigated in this thesis and the strong temperature dependence on the transformation rate indicated a diffusion based nucleation and growth mechanism. The results gave additional information regarding activation energy of the transformation and the critical wavelength of the cubic domains at the onset of hexagonal AlN. After nucleation and growth, the hexagonal domains showed a striking resemblance with the preexisting cubic AlN microstructure.During metal cutting, the tool protecting coating is subjected to temperatures of ~900 ºC and pressure levels in the GPa range. The results in this thesis have shown a twofold effect of the pressure on the decomposition steps. Firstly, the spinodal decomposition was promoted by the applied pressure during metal cutting which was shown by comparisons with annealed samples at similar temperatures. Secondly, the detrimental transformation from cubic to hexagonal AlN was shown to be suppressed at elevated hydrostatic pressures. A theoretical pressure/temperature phase diagram, validated with experimental results, also showed suppression of hexagonal AlN by an increased temperature at elevated pressures.The spinodal decomposition during annealing and metal cutting was in this work also shown to be strongly affected by the elastic anisotropy of TiAlN, where the phase separation was aligned along the elastically softer <100> directions in the crystal. The presence of the anisotropic microstructure enhanced the mechanical properties compared to the isotropic case, mainly due to a shorter distance between the c-AlN and c-TiN domains in the anisotropic case. Further improvement of the metal cutting behavior ii was realized by depositing individual layers with an alternating bias. The individual bias layers exhibited microstructural differences with different residual stress states. The results of the metal cutting tests showed an enhanced wear resistance in terms of both crater and flank wear compared to coatings deposited with a fixed bias.iii Populärvetenskaplig sammanfattningI den här avhandlingen presenteras forskningsresultat på en keramisk beläggning, TiAlN (titanaluminiumnitrid), som ligger som ett skyddande skikt på svarvskär. Tjockleken på beläggni...

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Wear of TiC-coated carbide tools in dry turning

Cited by 56 publications

References 31 publications

Improved metal cutting performance with bias-modulated textured Ti0.50Al0.50N multilayers

Improved metal cutting performance with bias-modulated textured Ti0.50Al0.50N multilayers

Mapping wear mechanisms of TiC/Ti composite coatings

Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures

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