Fatigue of Beta Processed and Beta Heat-treated Titanium Alloys

Contents.- 1 Introduction.- 1.1 Survey of fatigue life assessment methods.- 2 Metallurgy and microstructure.- 2.1 The general metallurgy of titanium alloys.- 2.2 Conventional thermomechanical processing of alloys like Ti-6Al-4V.- 2.3 beta processing and/or beta heat-treatment.- 2.4 Crystallography of the beta phase transition.- 2.5 Microstructure of beta annealed Ti-6Al-4V ELI thick plate.- 3 Fatigue crack initiation.- 3.1 Microstructural initiation sites in near- and - beta alloys: literature.- 3.2 Microstructural initiation sites: beta annealed Ti-6Al-4V ELI thick plate .- 3.3 Metallurgical defects.- 4 Fatigue initiation lives.- 4.1 Microstructural factors.- 4.2 Fatigue life - microstructure trends.- 4.2.1 Unnotched (smooth specimen) fatigue.- 4.2.2 Notched fatigue.- 4.3 Summary.- 5 Short/small fatigue crack growth.- 5.1 Introduction.- 5.1.1 Significance of short/small cracks.- 5.1.2 Definitions of short and small cracks.- 5.1.3 Size criteria.- 5.2 Short/small fatigue crack growth data from the literature.- 5.2.1 Coarse-grained fully lamellar IMI 685.- 5.2.2 Effects of microstructure: fully lamellar.- 5.2.3 Effects of microstructure: different types of microstructures.- 5.3 Summary.- 6 Long/large fatigue crack growth.- 6.1 Introduction.- 6.2 Fatigue thresholds.- 6.2.1 Fully lamellar microstructures.- 6.2.2 Different types of microstructures.- 6.3 Regions I and II fatigue crack growth in fully lamellar microstructures.- 6.4 Regions I and II fatigue crack growth in different types of microstructures.- 6.5 Region II bilinear log da/dN - log DeltaK fatigue crack growth.- 6.6 Summary.- 7 Concluding remarks .- 8 References.