Fatigue Behaviour of Additive Manufactured Metallic Materials

Dear Colleagues,

Additively Manufactured metals are produced for several industries (biomedical, aeronautics, energy, …) using different alloys (Steel, Aluminum, Titanium, …). Aeronautical components such as TiAl turbine blades are certified to fly and Titanium dental implants are regularly produced. One of the major characteristics of Additively Manufactured components is the direct link between the production of the final component and the initial CAD design. The design constraints are also relatively limited compared to more traditional processes, allowing to produce optimized geometries. Like for all other manufacturing processes, a qualification stage must be carefully developed in order to insure that the final component is within the specifications related to six major characteristics: density, 3D geometry, surface roughness, residual stresses, microstructure and mechanical properties. Other specifications can be requested depending on the final application. When the component is submitted to fatigue loading, a special attention must be paid to the surface roughness, the defect population, residual stresses and microstructure.

This special issue will focus on the fatigue behavior of additively manufactured metals with a special attention to the following parameters: microstructure, defect population, roughness and residual stresses. Different modelling strategies (deterministic and probabilistic) regarding crack initiation and growth from surface, defects or microstructural inhomogeneities will also be addressed. As the metal produced is inherited from this process, the relation to the process parameter must be clearly specified. Heat treatment must also be considered as a major parameter (HIP, stress release, …). Each of these parameters can have an influence on the fatigue behavior and this influence can vary from a material to another (Titanium appears to be more sensitive to defects compared to Aluminum for example), from a process to another (SLM generates more internal defects compared to WAAM) and also depending on the fatigue regime (Crack initiation shifts from the surface to the bulk when the stress level is low enough to reach fatigue lives larger than 10⁸-10⁹ cycles)

The objectives of this special issue are to present recent advances from both experimental and modelling perspectives in order to help the emergence of important new topics and approaches in this fast evolving field.

Prof. Dr. Yves Nadot
Prof. Dr. Jean-Yves Buffière
Prof. Dr. Franck Morel
Guest Editors

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