TY - JOUR
T1 - Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti-6Al-4V alloy
AU - Cassar, G.
AU - Avelar-Batista Wilson, J. C.
AU - Banfield, S.
AU - Housden, J.
AU - Fenech, M.
AU - Matthews, A.
AU - Leyland, A.
PY - 2011/9/1
Y1 - 2011/9/1
N2 - 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 μm 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.
AB - 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 μm 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.
KW - Physical vapour deposition
KW - Rotating-bending fatigue
KW - Ti-6Al-4V
KW - Triode plasma diffusion
UR - http://www.scopus.com/inward/record.url?scp=79956093173&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2011.04.004
DO - 10.1016/j.ijfatigue.2011.04.004
M3 - Article
AN - SCOPUS:79956093173
SN - 0142-1123
VL - 33
SP - 1313
EP - 1323
JO - International Journal of Fatigue
JF - International Journal of Fatigue
IS - 9
ER -