Fretting fatigue crack initiation and propagation in Ti6Al4V sheets under tribocorrosive conditions of artificial seawater and physiological solutions

摘要: The interaction of mechanical components experiencing relative movements and cyclic loads in a corrosive environment is known as fretting corrosion or tribocorrosion. In the current work, mechanism crack initiation propagation dovetail slots Ti6Al4V samples (in contact with carbide rods) under conditions was investigated. A newly developed test rig installed on universal testing machine used to conduct tests at 20 Hz frequency 5 7.5 kN loads. Tests were conducted room temperature 3.5% NaCl phosphate-buffered saline solutions. Crack all examined by metallurgical microscope, detailed analysis fractured carried out scanning electron microscope. comparison dry conditions, early faster observed salt physiological solution environments. Colored spots large amounts chlorine, sodium, oxygen found around cracks, plastically deformed regions provided evidence attack. Large oxygen, phosphorous, potassium, sodium detected environment.