Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 33, Issue 9, Pages 1313-1323Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2011.04.004
Keywords
Rotating-bending fatigue; Triode plasma diffusion; Physical vapour deposition; Ti-6Al-4V
Funding
- UK Technology Strategy Board [TP/22076]
- EPSRC [EP/H050124/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H050124/1] Funding Source: researchfish
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The effect of triode-plasma enhanced low-pressure oxygen and/or nitrogen diffusion treatments, either as a single process or in conjunction with plasma-assisted physical vapour deposition (PAPVD) on Ti-6Al-4V has been studied under rotating-bending fatigue testing. Following the diffusion treatment, samples exhibit a hardened case, more than 30 pm deep. Semi-logarithmic S-N plots are used to demonstrate and compare the significant changes in fatigue resistance obtained from each process. Fractography and residual stress measurements show that, compared to annealed samples, the fatigue strength of the diffusion-treated samples was superior; although the result changed depending on the processing parameters and microstructure of the substrate material. Also, unsupported and mechanically uncompliant ceramic coatings, such as TiN, promote the initiation of multiple crack sites, which lead to premature failure of the Ti-alloy substrate and a consequent reduction in endurance limit. (C) 2011 Elsevier Ltd. All rights reserved.
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