Comparative study of fatigue properties of Ti-6Al-4V specimens built by electron beam melting (EBM) and selective laser melting (SLM)
- Thales Global Services, 19/21 avenue Morane Saulnier, Vélizy-Villacoublay 78140 (France)
- Laboratoire de Mécanique de Lille (LML), CNRS, UMR 8107, Ecole Centrale de Lille, Cité Scientifique, Villeneuve d’Ascq 59655 (France)
- Laboratoire de Mécanique des Solides (LMS), CNRS, UMR 7649, Ecole Polytechnique, Palaiseau Cedex 91128 (France)
Highlights: • EBM and SLM parts have similar fatigue properties, equivalent to cast alloys. • Surface defects are more critical than unmelted zones and internal small defects. • HIP treatment largely improves lifetimes compared to as-built specimens. - Abstract: Electron Beam Melting (EBM) and Selective Laser Melting (SLM) are two of the most developed powder bed fusion based additive manufacturing processes. In this paper, fatigue properties of Ti-6Al-4V specimens built by EBM and SLM are compared. Several parameters are assessed: processes, manufacturing direction, surface roughness, HIP treatment. Fatigue properties are analyzed in relation with the crack initiation mechanisms identified on each specimen's post-mortem micrographs. Machined specimens show better fatigue properties as surface defects are removed. HIP treatment improves fatigue properties by decreasing the defects size. Small differences in lifetime are observed between horizontal and vertical building directions because of different defect shapes regarding the loading axis. Finally, EBM and SLM parts have approximately the same fatigue properties, which are equivalent to conventional casting processes.
- OSTI ID:
- 22805759
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 143; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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