Observations on microstructurally sensitive fatigue crack growth in a widmanstätten Ti-6Al-4V alloy

Effect of Microstructure Transformations on Fatigue Properties of Laser Beam Welded Ti‐6Al‐4V Butt Joints Subjected to Postweld Heat Treatment

“…Increased colony size and consequently larger efective slip length leads to a more bifurcated crack growth proile and increased crack propagation resistance of the material. This result is consistent with the works of Yoder et al [41][42][43] and L(tjering and Williams [28].…”

“…A comprehensive study on the inluence of microstructural variables on near-threshold fatigue behaviour of macrocracks in titanium Ti-6Al-4V was conducted by Yoder et al [41][42][43]. Bilinear crack growth rate behaviour was observed, with two distinct branches that independently obey the power law and join together in the transition point ∆K T ).…”

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

“…(2) Structure-Sensitive, Crystallographic Bifurcation (1AK < AKT)--The similarity in behavior of the four alloys is further illustrated by crack-path sectioning normal to the fracture surface. Below their respective transition points, alloys 1 through 3 exhibit crystallographic bifurcation in the Widmanstilitten packets similar to that we noted previously in alloy 4 [5]. Thus within packets that border the Mode I crack plane, multiple parallel cracks appear with a distinct relation to the orientation of a-phase platelets, as illustrated in VFig.…”

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.…”