Taha Hakan Demirci
Investigation of the effect of porosity on fatigue behavior for DMLS built parts using 3D X-ray Computed Tomography.
Rel. Luca Iuliano, Abdollah Saboori, Roland Lachmayer. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Meccanica (Mechanical Engineering), 2022
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Abstract
Following recent developments in manufacturing technology, Additive Manufacturing (AM) has become an important figure in the production of complex geometries in which conventional subtractive methods are typically incapable of producing or are excessively high costs. However, AM techniques have their capabilities and limitations. One limitation that affects mechanical properties, particularly fatigue strength under cyclic loads, is unwanted material porosity causing fatigue failure. Fatigue failure, due to its nature, is random, and a reason for this stochastic nature is the uncertainty of the porosity dispersion in the AM-built part. A commonly used AM process is Laser Powder Bed Fusion (LPBF), which can print near full-density (99.5+%) parts if process parameters are set correctly.
Therefore, EOSINT M 280 printer based on Direct Metal Laser Sintering (DMLS) technology, which is also an LPBF technique, was used to manufacture fatigue test specimens using 1.2709 metal powder with a chemical composition 18Ni9Co5Mo1Ti
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