Influence of porosity on the fatigue behaviour of additively fabricated TA6V alloys

This work is focused on the influence of porosity when dealing with the fatigue behaviour of the TA6V alloys fabricated by the selective laser melting (SLM) process. The presence of porosity is one of the major issue facing additive manufacturing (AM) of metallic components subjected to fatigue load...

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Bibliographic Details
Published inMATEC Web of Conferences Vol. 165; p. 2008
Main Authors Le, Viet-Duc, Pessard, Etienne, Morel, Franck, Edy, François
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 01.01.2018
Subjects
Additive manufacturing
Crack propagation
Fatigue failure
Fatigue life
Fatigue strength
Laser beam melting
Pore size
Porosity
Titanium base alloys
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Summary:This work is focused on the influence of porosity when dealing with the fatigue behaviour of the TA6V alloys fabricated by the selective laser melting (SLM) process. The presence of porosity is one of the major issue facing additive manufacturing (AM) of metallic components subjected to fatigue loading. In order to study the effect of porosity on the fatigue behaviour, a vast experimental campaign has been undertaken. These materials are fabricated by the SLM process with different building directions (horizontal, vertical and diagonal) thanks to which specimen batches with different pore sizes are obtained. It is observed that despite a low porosity fraction (around 0.01%), the influence of pores on the fatigue strength of the materials is pronounced. A mapping approach is presented, which links the applied stress, the pore size and the fatigue life. This approach makes it possible to accurately characterize the effect of the porosity size, and also to construct Kitagawa-Takahashi diagrams from S-N data.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/201816502008