Ti–6Al–4V welded joints via electron beam welding: Microstructure, fatigue properties, and fracture behavior

The effect of microstructural characteristics on the fatigue properties of electron beam-welded joints of forged Ti–6Al–4V and its fracture behavior were investigated. Tensile tests and fatigue tests were conducted at room temperature in air atmosphere. The test data were analyzed in relation to mic...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-03, Vol.597, p.225-231
Main Authors: Yang, Xiaoguang, Li, Shaolin, Qi, Hongyu
Format: Article
Language:English
Subjects:
Applied sciences
Base metal
Crack propagation
Electron beam welding
Exact sciences and technology
Fatigue
Fatigue (materials)
Fatigue crack propagation
Fatigue failure
Fatigue properties
Forming
Fracture behavior
Fracture mechanics
Fractures
High cycle fatigue
Joining, thermal cutting: metallurgical aspects
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Production techniques
Titanium base alloys
Welding
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Summary:The effect of microstructural characteristics on the fatigue properties of electron beam-welded joints of forged Ti–6Al–4V and its fracture behavior were investigated. Tensile tests and fatigue tests were conducted at room temperature in air atmosphere. The test data were analyzed in relation to microstructure, high-cycle fatigue properties, low-cycle fatigue properties, and fatigue crack propagation properties. The high-cycle fatigue test results indicated that the fatigue strength of the joint welded via electron beam welding was higher than that of the base metal because the former had a high yield strength and all high-cycle fatigue specimens were fractured in the base metal. Although the joint specimens had a lower low-cycle fatigue life than the base metal, they mainly ruptured at the fusion zone of the joint specimen and their crack initiation mechanism is load-dependent. The fatigue crack propagation test results show that the joint had a slower crack propagation rate than the base metal, which can be attributed to the larger grain in the fusion zone.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.12.089