Abstract
The forged titanium alloys Ti6-2-4-2 and IMI834 were tested in fatigue at high temperature to determine the crack initiation and propagation behavior. Under simulated aero engine conditions the α/β-alloys showed a sensitivity to many types of mechanical and chemical damage of the surface. In addition a strong effect of test atmosphere (air, saltwater) on crack initiation and growth behavior was observed. At relatively low load amplitudes and with no surface damage, cracking took place internally. Typical crack initiation sites are quasi-cleavage facets which originate mainly at globular primary-α-phase.
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References
Yuen, A. et al, Correlations between Fracture Surface Appearance and Fracture Mechanics Parameters for Stage II Fatigue Crack Propagation in Ti-6A1-4V. Metallurgical Transaction, 1974, 5, 1833–1842.
Powell, B.E., Henderson, J. and Hall, R.F., The Growth of Corner Cracks under the Conjoint Action of High- und Low Cycle Fatigue. 1988, Air Force Wright Aeronautical Laboratories, Report No. AFWAL-TR-87–4130.
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© 1992 Elsevier Science Publishers Ltd
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Specht, J.U. (1992). The Low Cycle Fatigue Behaviour of Titanium Alloys. In: Rie, KT., et al. Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2860-5_4
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DOI: https://doi.org/10.1007/978-94-011-2860-5_4
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5269-6
Online ISBN: 978-94-011-2860-5
eBook Packages: Springer Book Archive