Journal of Materials Engineering and Performance
Fatigue crack initiation in Ti-6Al-4V has been investigated in high cycle fatigue (HCF) and low cycle fatigue (LCF) regimes at stress ratio R = 0.1 using the replication technique. In all four tested α/β microstructures, the crack was initiated by fracture of equiaxed alpha grain. Fractured alpha grains are seen on the fracture surface as flat facets with features characteristic of cleavage fracture. In the regime of low stress amplitudes and in the absence of reverse loading, cleavage fracture contributes to crack initiation and early stages of crack growth in Ti-6Al-4V. This mechanism is discussed in relation to the anomalous mean stress fatigue behavior exhibited by this alloy.
Ivanova, Svetlana G.
, Biederman, Ronald R.
, Sisson, Richard D.
(2002). Investigation of Fatigue Crack Initiation in Ti-6Al-4V During Tensile-Tensile Fatigue. Journal of Materials Engineering and Performance, 11(2), 226-231.
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Copyright 2002, ASM International. This paper was published in Journal of Materials Engineering and Performance Vol. 11 Iss. 2 pp. 226-231 and is made available as an electronic reprint with the permission of, ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.