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Defect-based assessment of 'as-built' surfaces for Ti6Al6V produced by SLM

Design of load-carrying components obtained by additive manufacturing subjected to

cyclic load is widely investigated. Factors such as surface quality, microstructural defects, printing

orientation, residual stress, heat treatment, geometry and size are the main variables involved

in the fatigue assessment of these components. A deeper understanding of the aforementioned

variables effects is necessary and it has been mainly investigated by experimental studies.

This study investigated the effects of of the 'as-built' condition on the fatigue properties of

an Ti6Al4V alloy manufactured by SLM in different orientations and annealed . The bending

fatigue results and surface quality assessment did not evidence a strong correlation with roughness

parameters. On the other hand, an analysis based on the size of the features at the fracture origin

proved to be successfull as a surface rating.

Analyses including the 'short crack effect' [1] allowed us to estimate Equivalent Initial Flaw

Size (EIFS) close to the real critical features [2, 3]. The EIFS allowed to fairly predict the life of

specimens tested in the different orientations.

Lucia Barricelli
Politecnico di Milano
Additional Authors:
  • Prof. Dr. Stefano Beretta
    Politecnico di MIlano
  • Dr. Luca Patriarca
    Politecnico di MIlano
  • M. Riccio