Fatigue properties of Ti-based hard coatings deposited onto tool steels

Stoiber, Michael; Panzenböck, Michael; Mitterer, Christian; Lugmair, C.

doi:10.1016/s0257-8972(01)01220-8

Cited by 41 publications

(18 citation statements)

References 18 publications

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“…The interest of this material lays in its wide range of applications, such as protective material for industrial tools, 5 diffusion barriers in semiconductor technology, 6 a gate electrode in transistors, 7 a contact layer in solar cells, 8 etc. This high performance of TiN is due to its excellent physical properties: high hardness, excellent tribological behavior, thermal and chemical stability, etc., which in some cases can be related to the film morphology.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic anomalous surface roughening of TiN films deposited by reactive sputtering

et al. 2006

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We study surface kinetic roughening of TiN films grown on Si͑100͒ substrates by dc reactive sputtering. The surface morphology of films deposited for different growth times under the same experimental conditions were analyzed by atomic force microscopy. The TiN films exhibit intrinsic anomalous scaling and multiscaling. The film kinetic roughening is characterized by a set of local exponent values ␣ loc = 1.0 and ␤ loc = 0.39, and global exponent values ␣ = 1.7 and ␤ = 0.67, with a coarsening exponent of 1 / z = 0.39. These properties are correlated to the local height-difference distribution function obeying power-law statistics. We associate this intrinsic anomalous scaling with the instability due to nonlocal shadowing effects that take place during thin-film growth by sputtering.

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Section: Introductionmentioning

confidence: 99%

Intrinsic anomalous surface roughening of TiN films deposited by reactive sputtering

et al. 2006

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“…In combination with post-test scanning electron microscopy the proposed test method will give information about not only the critical normal loads and coating damage mechanisms at single pass scratch testing and a low number of loading cycles but also the fatigue and wear properties at a high number of loading cycles, N > 1000. Compared with the common used impact tests used for evaluating the fatigue properties of thin hard coatings the proposed test is believed to more closely simulate the contact conditions and prevailing stress states in sliding contact tribosystems although the number of cycles are significantly lower than in the impact tests [5,[19][20][21].…”

Section: Proposed Test Methodmentioning

confidence: 99%

“…All tests were performed in ambient air (20)(21)(22) • C, 25-26% RH) and repeated two times. During testing the friction coefficient was continuously recorded and, in combination with post-test characterisation of the wear track using optical microscopy, used in order to determine the number of cycles to coating failure.…”

Section: Tribologicalmentioning

confidence: 99%

“…This is to a large extent due to the fact that the coating deposition processes including substrate cleaning and pre-treatment of today result in excellent adhesion. An alternative test, able to evaluate the mechanical properties including the fatigue resistance of CVD and PVD coatings is the repetitive impact test [5,[19][20][21]. In this test the coated substrate is exposed to an oscillating indenter, usually a ceramic or a cemented carbide ball, impacting the surface at a constant maximum force during a large number of impacts, typically 10 6 .…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Tribological Properties of PVD-Coated Cemented Carbide as Evaluated by a New Multipass Scratch-Testing Method

Fallqvist

M’Saoubi²,

Andersson³

et al. 2012

Advances in Tribology

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A new test method based on multipass scratch testing has been developed for evaluating the mechanical and tribological properties of thin, hard coatings. The proposed test method uses a pin-on-disc tribometer and during testing a Rockwell C diamond stylus is used as the "pin" and loaded against the rotating coated sample. The influence of normal load on the number of cycles to coating damage is investigated and the resulting coating damage mechanisms are evaluated by posttest scanning electron microscopy. The present study presents the test method by evaluating the performance of Ti 0.86 Si 0.14 N, Ti 0.34 Al 0.66 N, and (Al 0.7 Cr 0.3 ) 2 O 3 coatings deposited by cathodic arc evaporation on cemented carbide inserts. The results show that the test method is quick, simple, and reproducible and can preferably be used to obtain relevant data concerning the fatigue, wear, chipping, and spalling characteristics of different coating-substrate composites. The test method can be used as a virtually nondestructive test and, for example, be used to evaluate the fatigue and wear resistance as well as the cohesive and adhesive interfacial strength of coated cemented carbide inserts prior to cutting tests.

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“…Thin, hard coatings with excellent tribological properties, like TiN, TiAlN, CrN, etc., have already outperformed and successfully replaced traditional high-speed steel tools in the majority of cutting operations. 17,18 Despite this, the majority of forming tools are still uncoated. Besides the complex geometry, which makes it difficult to obtain uniform coating deposition, commercial hard wear-resistant coatings show a relatively high coefficient of friction and a high tendency for galling against typical formed materials.…”

Section: Introductionmentioning

confidence: 99%

Wear mechanisms and surface engineering of forming tools

Podgornik¹,

Leskovšek²

2015

Mater. Tehnol.

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The manufacturing of parts is faced with ever-increasing demands for higher strength (hardness) and toughness of the work material, as well as higher productivity and environmental concerns. At the same time, the quality requirements are high and will continue to grow in the future. This leads to restrictions in terms of the type and use of lubricants and especially to increased requirements relating to the wear and fatigue resistance of tools. The main focus on improving the wear resistance and tribological properties of forming tools has mainly been on developing tool steels with an improved fracture toughness and then modifying the lubricants for better retention and permeability at the tool/work-piece contact area. Nevertheless, the wear resistance of forming tools can also be successfully improved by surface-engineering techniques. In recent years, hard coatings in particular have shown enormous potential for improving the tribological properties of contact surfaces. This paper reviews the wear mechanisms encountered in forming processes, as well as various surface-engineering techniques designed to improve the wear resistance and the anti-sticking properties of forming tools. The possible benefits and restrictions of different surface-engineering techniques are presented for the example of sheet-metal forming, fine blanking and forging. Keywords: surface engineering, forming, hard coatings, topography, friction, wear Preoblikovalna industrija se spopada z nenehno nara{~ajo~imi zahtevami po vi{ji trdnosti (trdoti) in`ilavosti preoblikovanih materialov, kakor tudi ve~ji produktivnosti in skrbi za okolje. Isto~asno se pove~ujejo zahteve po kvaliteti izdelkov, kjer predvsem kvaliteta povr{ine postaja vedno bolj pomembna. To pomeni omejitve pri uporabi maziv ter seveda ve~je zahteve po obrabni odpornosti in vzdr`ljivosti preoblikovalnih orodij. Do nedavnega je izbolj{evanje obrabne obstojnosti in tribolo{kih lastnosti preoblikovalnih orodij temeljilo predvsem na razvoju bolj`ilavih in~istej{ih orodnih jekel ter modifikaciji maziv z bolj{imi mazalnimi lastnostmi. V zadnjih letih pa tudi na podro~ju preoblikovalnih orodij tehnike in`eniringa povr{in, {e posebej nanos trdih za{~itnih prevlek, omogo~ajo nadaljnje izbolj{anje tribolo{kih lastnosti kontaktnih povr{in. V prispevku so tako predstavljeni obrabni mehanizmi, ki so jim izpostavljena preoblikovalna orodja, kakor tudi razli~ne tehnike in`eniringa povr{ine, namenjene izbolj{anju obrabne obstojnosti in tornih lastnosti preoblikovalnih orodij. Problemi in prednosti uporabe in`eniringa povr{ine so poudarjene na primeru hladnega preoblikovanja plo~evine, {tancanja in kovanja.

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Fatigue properties of Ti-based hard coatings deposited onto tool steels

Cited by 41 publications

References 18 publications

Intrinsic anomalous surface roughening of TiN films deposited by reactive sputtering

Intrinsic anomalous surface roughening of TiN films deposited by reactive sputtering

Mechanical and Tribological Properties of PVD-Coated Cemented Carbide as Evaluated by a New Multipass Scratch-Testing Method

Wear mechanisms and surface engineering of forming tools

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