Evaluation on the tension and fatigue behavior of various PVD coated materials

Su, Yan; Yao, Shuhuai; Wei, C.S.; Wu, C.T.

doi:10.1016/s0040-6090(97)01013-4

Cited by 20 publications

(16 citation statements)

References 8 publications

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“…In other words, depending on the cyclic load level, the coating's inability to deform plastically (encouraging brittle cracks) can affect the overall structure's resistance to fatigue crack initiation. Such thin coatings, however, were found not to largely influence the bulk property of the coating‐substrate system because of their extremely small area compared with the dimensions of the substrate …”

Section: Introductionmentioning

confidence: 99%

Fatigue life behaviour of TiAlN and TiAlN/CrN coated notched P20 steel specimens

Rahmat

Ibrahim

Oskouei

et al. 2015

Fatigue Fract Eng Mat Struct

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The performance of single layer TiAlN and multilayered TiAlN/CrN physical vapour deposition coatings deposited on AISI P20 steel substrate in affecting overall fatigue resistance of notched specimens was assessed and compared with the performance of the uncoated counterparts. V‐shaped circumferential notches on cylindrical specimens were adopted for fatigue tests. Surface coating characteristics such as hardness, elastic modulus and microstrains were measured and found to be different and often larger than those of the steel substrate. Unlike the un‐notched (smooth) coated specimens, which are known to exhibit large improvements in fatigue life in the high cycle fatigue regime, considerable reductions in fatigue life of the coated notched samples were observed. This was understood to be because of the coating's brittleness, which induces at the notch tip early and frequent fatigue crack initiations, especially in the case of multiple layered coatings. Scanning electron microscope images showed more crack initiation sites in both the coated specimens compared with the uncoated specimen. Also, presence of dimples on the surface confirmed dimple rupture mechanism in the ductile steel substrate in the coated and uncoated specimens.

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Section: Introductionmentioning

confidence: 99%

Fatigue life behaviour of TiAlN and TiAlN/CrN coated notched P20 steel specimens

Rahmat

Ibrahim

Oskouei

et al. 2015

Fatigue Fract Eng Mat Struct

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“…The extensive use of coated structures has led to an increasing interest in the fracture and time‐ or cycle‐dependent failure of composite parts, particularly those involving surface ceramic films 1–7 . Among these research works, fatigue failure of bi‐material interfaces involving ceramic layers and metallic substrates involves different mechanisms and requires different interpretations 8–10 . Murakami et al 8 .…”

Section: Introductionmentioning

confidence: 99%

“…show an increase in the fatigue life with increasing film thickness. Su et al 9 . underline the strong relationship between the capability of improving the fatigue resistance of the coated part and the absence of damage (cracks) associated with the thin film, pointing out that the brittle PVD coating will be fractured when the applied deformation exceeds the critical strain of the film.…”

Section: Introductionmentioning

confidence: 99%

Fatigue resistance of CrN thin films deposited by arc evaporation process on H11 tool steel and 2205 duplex stainless steel

Baragetti

Gelfi

Vecchia

et al. 2005

Fatigue Fract Eng Mat Struct

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A B S T R A C T Notwithstanding the wide use of PVD coated components, not only in fields where tribological behaviour is important and well assessed, fatigue behaviour is still an object of research in applications where enhanced fatigue resistance is required. The aim of this paper is to analyse fatigue crack growth mechanisms and to relate their nucleation sites to the microstructure and to residual stress data. Two structural steels were used as the substrate (H11 tool steel grade and 2205 duplex stainless steel grade), while a monolayer of CrN, 5 µm deep, was deposed as a coating. Four-point bending fatigue tests were carried out in order to obtain the bending fatigue limit. Experimental results obtained by scanning electron microscopy analyses, residual stresses measurements and hardness evaluations carried out using a nanoindenter device were considered to explain the fatigue mechanisms involving a PVD coated part in terms both of nucleation site and crack growth process.

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“…The increase in surface roughness results from the formation of macroparticles on the film surfaces caused by splashing of the melted and unevaporated cathode material under arc discharge [28,29]. The presence of these particles affects the fatigue strength since they can act as crack nucleation sites [17]. However, the influence of surface roughness on the multilayer coating properties was small in this study because only a small difference in the surface morphology and roughness for the different multilayer coatings was observed.…”

Section: Methodsmentioning

confidence: 71%

“…There are many factors that can cause small or negative effects on the fatigue strength. These include defects in the film such as macroparticles [16], low critical fracture strain of the film [17], internal fracture from inclusions in the substrate [18] and degradation of the mechanical properties of the substrate due to a high deposition temperature [19]. To maintain and improve the fatigue strength of coatings, the effects of these negative factors need to be reduced.…”

Section: Introductionmentioning

confidence: 99%