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Article

Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion

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Universite de Lorraine, CNRS, LEM3, Arts et Metiers ParisTech, 57070 Metz, France
2
Universite de Lorraine, CNRS, LEM3, IMT, GIP InSIC, 88100 Saint Die des Vosges, France
*
Authors to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Materials 2022, 15(2), 509; https://doi.org/10.3390/ma15020509
Received: 8 November 2021 / Revised: 29 December 2021 / Accepted: 30 December 2021 / Published: 10 January 2022
(This article belongs to the Topic Metallurgical and Materials Engineering)
In order to simulate micromachining of Ti-Nb medical devices produced in situ by selective laser melting, it is necessary to use constitutive models that allow one to reproduce accurately the material behavior under extreme loading conditions. The identification of these models is often performed using experimental tension or compression data. In this work, compression tests are conducted to investigate the impact of the loading conditions and the laser-based powder bed fusion (LB-PBF) building directions on the mechanical behavior of β-Ti42Nb alloy. Compression tests are performed under two strain rates (1 s1 and 10 s1) and four temperatures (298 K, 673 K, 873 K and 1073 K). Two LB-PBF building directions are used for manufacturing the compression specimens. Therefore, different metallographic analyses (i.e., optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), electron backscatter diffraction (EBSD) and X-ray diffraction) have been carried out on the deformed specimens to gain insight into the impact of the loading conditions on microstucture alterations. According to the results, whatever the loading conditions are, specimens manufactured with a building direction of 45 exhibit higher flow stress than those produced with a building direction of 90, highlighting the anisotropy of the as-LB-PBFed alloy. Additionally, the deformed alloy exhibits at room temperature a yielding strength of 1180 ± 40 MPa and a micro-hardness of 310 ± 7 HV0.1. Experimental observations demonstrated two strain localization modes: a highly deformed region corresponding to the localization of the plastic deformation in the central region of specimens and perpendicular to the compression direction and an adiabatic shear band oriented with an angle of ±45 with respect to same direction. View Full-Text
Keywords: Ti-Nb alloy; additive manufacturing; selective laser melting; characterization; thermomechanical behavior Ti-Nb alloy; additive manufacturing; selective laser melting; characterization; thermomechanical behavior
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MDPI and ACS Style

Ben Boubaker, H.; Laheurte, P.; Le Coz, G.; Biriaie, S.-S.; Didier, P.; Lohmuller, P.; Moufki, A. Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion. Materials 2022, 15, 509. https://doi.org/10.3390/ma15020509

AMA Style

Ben Boubaker H, Laheurte P, Le Coz G, Biriaie S-S, Didier P, Lohmuller P, Moufki A. Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion. Materials. 2022; 15(2):509. https://doi.org/10.3390/ma15020509

Chicago/Turabian Style

Ben Boubaker, Housseme, Pascal Laheurte, Gael Le Coz, Seyyed-Saeid Biriaie, Paul Didier, Paul Lohmuller, and Abdelhadi Moufki. 2022. "Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion" Materials 15, no. 2: 509. https://doi.org/10.3390/ma15020509

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