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Effects of Very Low Pressures on Fatigue Fracture Surface Features in Ti-6Al-4V
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This study investigated how hydrogen content and cyclic loading frequency affect fatigue fracture surface features in Ti-6Al-4V titanium alloy tested in vacuum, finding that quasi-cleavage and crack growth rates both increase with hydrogen. Precise matching of fracture surface features suggests that certain pseudo-striations are not true fatigue markings, and that quasi-cleavage proceeds by combined micro-cleavage and microplastic crack coalescence.
The amount and quality of quasi-cleavage and possibly the crack growth rates caused by fatigue of Ti-6Al-4V in vacuum were enhanced by increasing hydrogen content and decreasing cyclic loading frequency. Precision matching studies of pseudo-striations on mating vacuum fatigue fracture surfaces lead to the tentative conclusion that these do not mark successive positions of the crack front, hence are not fatigue striations. Similar studies of quasi-cleavage areas show that tear ridges mate exactly, suggesting that such cracking proceeds by a combination of micro-cleavage crack initiation and microplastic coalescence of the micro-cracks.
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Microstructural Origin of Flutes and Their Use in Distinguishing Striationless Fatigue Cleavage from Stress-Corrosion Cracking in Titanium Alloys
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This study compared titanium alloy (Ti-8Al-1Mo-1V) specimens fractured by both low-stress striationless fatigue and stress-corrosion cracking (SCC) to determine distinguishing fracture features. The presence of microplastic fracture features called flutes was found to be uniquely characteristic of SCC and absent from low-stress fatigue fractures, arising from planar slip tendency and multiple cleavage during crack propagation.
Influence of operational factors on the patterns of distribution of discrete deformations of the surface layer of metal structures for multi-cycle loading of samples
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This study investigated how structural material heterogeneity and microplastic strain localization in the surface layers of metal structures affect fatigue under multi-cycle loading. It found that non-uniform micro-stress states drive irregular development of micro-plastic strains that form a dissipative structure in the polycrystalline subsurface layer, which is critical for fatigue performance.
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