Fatigue Crack Propagation Resistance of Beta-Annealed Ti-6Al-4V Alloys of Differing Interstitial Oxygen Contents

Influence of second phases on fatigue crack growth behavior of nickel aluminum bronze

“…It was found that coarser a grains in the normalized sample had a better crack growth resistance even in closure free environment [26]. The fatigue crack growth rate decreases with an increase in grain size due to the increased crack deflection closure effects [27,28]. Of the three microstructures considered here, the normalized sample shows the most tortuous path, followed by the as-cast sample, and then the straightest propagation path in the annealed sample.…”

The Effect of Environment and Temperature on the Fatigue Behavior of Titanium Alloys

“…Much of this structure sensitivity is due to a greater tendency for the crack to deviate from a plane perpendicular to the tensile stress axis as it follows forward microstructural paths. 1 ,3,4,6-8, 65,70,73,74,82,85,89 Such an instance is shown in Fig. 14.…”

A Study on the Change of Fatigue Fracture Mode in Two Titanium Alloys

“…It has been shown in numerous studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14] that a change in fatigue fracture surface appearance or a slope change in fatigue crack growth curve (da/dN versus DK curve) may take place in titanium alloys, resulting from a transition in fatigue fracture mode. This transition corresponds to the fact that fracture is microstructure-sensitive at low DK levels, while it is microstructure-insensitive at higher DK levels (referred to as low and high DK in the present study), and is reported to correlate with the size of the plastic zone at the crack tip.…”

“…This transition corresponds to the fact that fracture is microstructure-sensitive at low DK levels, while it is microstructure-insensitive at higher DK levels (referred to as low and high DK in the present study), and is reported to correlate with the size of the plastic zone at the crack tip. The transition occurs at the stress intensity factor range at which either the cyclic plastic zone size [1][2][3][4][5][6][7] or monotonic plastic zone size [11,12] attains the average dimensions of the controlling microstructural features. These controlling scales were reported to be the a grain size [1,8], the size of Widmanstätten packets [3][4][5], the platelet a packet size [10] or the lamella width [11].…”

“…The transition occurs at the stress intensity factor range at which either the cyclic plastic zone size [1][2][3][4][5][6][7] or monotonic plastic zone size [11,12] attains the average dimensions of the controlling microstructural features. These controlling scales were reported to be the a grain size [1,8], the size of Widmanstätten packets [3][4][5], the platelet a packet size [10] or the lamella width [11]. The purpose of this paper is to examine the controlling microstructural features for the fracture mode transition in different microstructures of two titanium alloys, and to analyse possible mechanisms for the transition.…”