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Directed Energy Deposition versus Wrought Ti‐6Al‐4V: A Comparison of Microstructure, Fatigue Behavior, and Notch Sensitivity
Author(s) -
Razavi Seyed Mohammad Javad,
Berto Filippo
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900220
Subject(s) - materials science , microstructure , fatigue limit , classification of discontinuities , composite material , lens (geology) , fatigue testing , work (physics) , sensitivity (control systems) , structural engineering , mechanical engineering , optics , mathematical analysis , physics , mathematics , electronic engineering , engineering
Laser Engineered Net Shaping (LENS), a Direct Energy Deposition (DED) additive manufacturing process is a 3D manufacturing process generally used to produce fully dense parts or to repair/add additional material to an existing component. The main aim of this work is to evaluate the fatigue behavior of LENS specimens in the presence of geometrical discontinuities and to compare its performance to the one obtained from wrought specimens. For this aim, axial fatigue tests are carried out on three sets of specimens namely, smooth, semi‐circular and V‐notched specimens to determine the fatigue strength and notch sensitivity of the LENS and wrought Ti‐6Al‐4V materials. The LENS material shows higher fatigue strength and notch sensitivity compared to wrought material which is attributed to the unique microstructural features leading to different fatigue failure mechanisms. Further, the fatigue data is assessed by use of strain energy density as a failure criterion.