Mechanism of porosity formation and influence on mechanical properties in selective laser melting of Ti-6Al-4V parts
Language
en
Article de revue
This item was published in
Materials & Design. 2018-10, vol. 156, p. 480-493
Elsevier
English Abstract
An original approach based on 2D fracture surface and 3D X-ray tomography analysis is proposed in this paper. Its application in selective laser melting of Ti-6Al-4V provides substantive clarifications regarding both ...Read more >
An original approach based on 2D fracture surface and 3D X-ray tomography analysis is proposed in this paper. Its application in selective laser melting of Ti-6Al-4V provides substantive clarifications regarding both mechanisms of porosity formation and their influence on mechanical properties. Unambiguously, a one-to-one relationship between the scanning strategy pattern and the 3D spatial distribution of porosities is highlighted. In an original manner, the 3D location of porosities, their morphology and their orientation are analyzed with respect to the laser spot path. The results show that pores are mainly localized on the overlay zones and support the lack of energy induced by the lower energy at the periphery of the laser spot as the main mechanism of porosity formation. Finally, both tensile properties and crack path are shown to be influenced by the presence and 3D distribution of porositiesRead less <
English Keywords
Porosity
Ti-6Al-4V
Selective laser melting
Fracture surface
X-ray tomography
Mechanical properties
Additive manufacturing
Scanning strategy
Origin
Hal imported