Fatigue behavior of PVD coated Ti–6Al–4V alloy

The aim of the present work is to identify an environmentally clean coating process that will present lower influence in the Ti–6Al–4V fatigue strength. Axial fatigue tests of Ti–6Al–4V alloy TiN, CrN and WC:H (tungsten containing diamond-like carbon) Physical Vapor Deposition (PVD) coated was evalu...

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Veröffentlicht in:	International journal of fatigue 2011-06, Vol.33 (6), p.759-765
Hauptverfasser:	Costa, M.Y.P., Venditti, M.L.R., Cioffi, M.O.H., Voorwald, H.J.C., Guimarães, V.A., Ruas, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Chromium Coating Cracks Diamond-like carbon films Exact sciences and technology Fatigue Fatigue (materials) Fatigue failure Fatigue strength Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Metals. Metallurgy Physical vapor deposition Production techniques PVD coatings Surface treatment Titanium alloys Titanium base alloys
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Beschreibung
Zusammenfassung:	The aim of the present work is to identify an environmentally clean coating process that will present lower influence in the Ti–6Al–4V fatigue strength. Axial fatigue tests of Ti–6Al–4V alloy TiN, CrN and WC:H (tungsten containing diamond-like carbon) Physical Vapor Deposition (PVD) coated was evaluated. Decrease in fatigue life was observed for coated specimens in comparison to base metal. Scanning Electron Microscopy technique was used to observe crack origin sites and coating thickness. DLC coating provides higher Ti–6Al–4V alloy PVD coated fatigue strength due to lower defects presence and the chromium interlayer, which acts as a barrier to fatigue crack propagation.
ISSN:	0142-1123 1879-3452
DOI:	10.1016/j.ijfatigue.2010.11.007