期刊
MATERIALS & DESIGN
卷 156, 期 -, 页码 480-493出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.06.049
关键词
Additive manufacturing; Selective laser melting; Ti-6Al-4V; Porosity; Mechanical properties; Fracture surface; X-ray tomography; Scanning strategy
资金
- We are-3D Materials and Prismadd Grenoble
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 porosities. (C) 2018 Elsevier Ltd. All rights reserved.
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