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Title: Comparative study of fatigue properties of Ti-6Al-4V specimens built by electron beam melting (EBM) and selective laser melting (SLM)

Abstract

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.

Authors:
 [1];  [2];  [1];  [3]
  1. Thales Global Services, 19/21 avenue Morane Saulnier, Vélizy-Villacoublay 78140 (France)
  2. Laboratoire de Mécanique de Lille (LML), CNRS, UMR 8107, Ecole Centrale de Lille, Cité Scientifique, Villeneuve d’Ascq 59655 (France)
  3. Laboratoire de Mécanique des Solides (LMS), CNRS, UMR 7649, Ecole Polytechnique, Palaiseau Cedex 91128 (France)
Publication Date:
OSTI Identifier:
22805759
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 143; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM COMPOUNDS; CASTING; CRACK PROPAGATION; ELECTRON BEAM MELTING; FATIGUE; LASER RADIATION; ROUGHNESS; SURFACES; TERNARY ALLOY SYSTEMS; TITANIUM COMPOUNDS; VANADIUM COMPOUNDS

Citation Formats

Chastand, Victor, Quaegebeur, Philippe, Maia, Wilson, and Charkaluk, Eric. Comparative study of fatigue properties of Ti-6Al-4V specimens built by electron beam melting (EBM) and selective laser melting (SLM). United States: N. p., 2018. Web. doi:10.1016/J.MATCHAR.2018.03.028.
Chastand, Victor, Quaegebeur, Philippe, Maia, Wilson, & Charkaluk, Eric. Comparative study of fatigue properties of Ti-6Al-4V specimens built by electron beam melting (EBM) and selective laser melting (SLM). United States. https://doi.org/10.1016/J.MATCHAR.2018.03.028
Chastand, Victor, Quaegebeur, Philippe, Maia, Wilson, and Charkaluk, Eric. Sat . "Comparative study of fatigue properties of Ti-6Al-4V specimens built by electron beam melting (EBM) and selective laser melting (SLM)". United States. https://doi.org/10.1016/J.MATCHAR.2018.03.028.
@article{osti_22805759,
title = {Comparative study of fatigue properties of Ti-6Al-4V specimens built by electron beam melting (EBM) and selective laser melting (SLM)},
author = {Chastand, Victor and Quaegebeur, Philippe and Maia, Wilson and Charkaluk, Eric},
abstractNote = {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.},
doi = {10.1016/J.MATCHAR.2018.03.028},
url = {https://www.osti.gov/biblio/22805759}, journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 143,
place = {United States},
year = {2018},
month = {9}
}