Influence of defects on the very high cycle fatigue behaviour of forged aeronautic titanium alloy
1 LEME, U. Paris Ouest Nanterre La Defense, 50 rue de Sèvres, 92410 Ville-d'Avray, France
2 Arts et Métiers ParisTech, I2M, CNRS, Université Bordeaux 1, Esplanade des Arts et Métiers, 33405 Talence, France
3 SCCAFS, Air. Sheremetevo-1, PO Box 54, Moscow reg., Chimkinskiy State 141426, Russia
a Corresponding author: e-mail: email@example.com
This paper is focused on fatigue failure of forged aeronautic titanium alloy Ti-6Al-4Mo under VHCF loading. Continuous fatigue tests were carried out in gigacycle fatigue regime (up to on 1010 cycles) on specimens machined from real aircraft compressor disk produced by forging. It has been shown, that crack initiation site shifts from surface to subsurface location with stress amplitude decreasing and fatigue life increasing. Microstructural inhomogeneities so that “hard” alpha particles, borders of large alpha lamella clusters and TiN particles are the cause of fatigue crack nucleation in forged Ti-6Al-4Mo titanium alloy under VHCF loading.
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