A study of cyclic fatigue, damage initiation, damage propagation, and fracture of welded titanium alloy plate

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 527; no. 24; pp. 6649 - 6659
• Main Authors: Srivatsan, T.S., Bathini, U., Patnaik, A., Quick, T.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 25.09.2010; Elsevier
• Subjects: Alloy plating; Applied sciences; Crack initiation; Crack propagation; Damage; Damage initiation; Damage propagation; Elasticity. Plasticity; Exact sciences and technology; Fatigue; Fatigue failure; Fatigue life; Fracture; Fracture mechanics; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Scanning electron microscopy; Titanium base alloys; Welded titanium alloy; Damage initiation; Fatigue life; Fracture; Welded titanium alloy; Microstructure; Damage propagation; Scanning electron microscopy; Ultimate strength method; Fatigue; Microscopic model; Fatigue fracture; Titanium base alloys; Tension test; Transition metal alloy; Fractography; Fracture mode; Butt weld; Crack initiation; Damaging
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.06.086

In this paper, the influence of test specimen orientation and microstructure on cyclic stress-amplitude controlled fatigue response, damage initiation, damage propagation and fracture behavior of samples taken from a welded plate of titanium alloy is presented and discussed. Test specimens from the chosen alloy were prepared from an as-welded plate of the material with the stress axis both parallel (longitudinal) and perpendicular (transverse) to the deformed (rolling) direction of the plate. The test specimens were cyclically deformed at different values of maximum stress at a constant load ratio of 0.1, and the resultant cycles-to-failure was recorded. The fracture surfaces of the deformed and failed test specimens were examined in a scanning electron microscope to establish the macroscopic fracture mode, the intrinsic features on the fatigue fracture surface and the role of applied stress-microstructural feature interactions in establishing the microscopic mechanisms governing failure.