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Article

In Situ Formation of a Metastable β-Ti Alloy by Laser Powder Bed Fusion (L-PBF) of Vanadium and Iron Modified Ti-6Al-4V

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Institute of Photonic Technologies, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany
2
Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordan-Straße 6, 91052 Erlangen, Germany
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Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 8, 91058 Erlangen, Germany
4
Institute of Manufacturing Technology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Egerlandstraße 11–13, 91058 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Metals 2018, 8(12), 1067; https://doi.org/10.3390/met8121067
Received: 27 November 2018 / Revised: 12 December 2018 / Accepted: 13 December 2018 / Published: 14 December 2018
The aim of this work is to investigate the β-Ti-phase-stabilizing effect of vanadium and iron added to Ti-6Al-4V powder by means of heterogeneous powder mixtures and in situ alloy-formation during laser powder bed fusion (L-PBF). The resulting microstructure was analyzed by metallographic methods, scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). The mechanical properties were characterized by compression tests, both prior to and after heat-treating. Energy dispersive X-ray spectroscopy showed a homogeneous element distribution, proving the feasibility of in situ alloying by LPBF. Due to the β-phase-stabilizing effect of V and Fe added to Ti-6Al-4V, instead of an α’-martensitic microstructure, an α/β-microstructure containing at least 63.8% β-phase develops. Depending on the post L-PBF heat-treatment, either an increased upsetting at failure (33.9%) compared to unmodified Ti-6Al-4V (28.8%), or an exceptional high compressive yield strength (1857 ± 35 MPa compared to 1100 MPa) were measured. The hardness of the in situ alloyed material ranges from 336 ± 7 HV0.5, in as-built condition, to 543 ± 13 HV0.5 after precipitation-hardening. Hence, the range of achievable mechanical properties in dependence of the post-L-PBF heat-treatment can be significantly expanded in comparison to unmodified Ti-6Al-4V, thus providing increased flexibility for additive manufacturing of titanium parts. View Full-Text
Keywords: laser powder bed fusion (L-PBF); additive manufacturing; titanium alloys; microstructure; compression test laser powder bed fusion (L-PBF); additive manufacturing; titanium alloys; microstructure; compression test
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MDPI and ACS Style

Huber, F.; Papke, T.; Scheitler, C.; Hanrieder, L.; Merklein, M.; Schmidt, M. In Situ Formation of a Metastable β-Ti Alloy by Laser Powder Bed Fusion (L-PBF) of Vanadium and Iron Modified Ti-6Al-4V. Metals 2018, 8, 1067. https://doi.org/10.3390/met8121067

AMA Style

Huber F, Papke T, Scheitler C, Hanrieder L, Merklein M, Schmidt M. In Situ Formation of a Metastable β-Ti Alloy by Laser Powder Bed Fusion (L-PBF) of Vanadium and Iron Modified Ti-6Al-4V. Metals. 2018; 8(12):1067. https://doi.org/10.3390/met8121067

Chicago/Turabian Style

Huber, Florian, Thomas Papke, Christian Scheitler, Lukas Hanrieder, Marion Merklein, and Michael Schmidt. 2018. "In Situ Formation of a Metastable β-Ti Alloy by Laser Powder Bed Fusion (L-PBF) of Vanadium and Iron Modified Ti-6Al-4V" Metals 8, no. 12: 1067. https://doi.org/10.3390/met8121067

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