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18.04.2021 | Full Research Article

Microstructure and mechanical properties of β-21S Ti alloy fabricated through laser powder bed fusion

verfasst von: Maria Argelia Macias-Sifuentes, Chao Xu, Oscar Sanchez-Mata, Sun Yong Kwon, Sila Ece Atabay, Jose Alberto Muñiz-Lerma, Mathieu Brochu

Erschienen in: Progress in Additive Manufacturing | Ausgabe 3/2021

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Abstract

Metastable β-titanium alloys are attractive for their high strength-to-density ratio, good hardenability, excellent fatigue behavior, and corrosion resistance. Among these alloys, β-21S, with a composition of Ti–15Mo–3Nb–3Al–0.2Si (wt%), is known to offer improved elevated temperature strength, creep resistance, thermal stability, and oxidation resistance. In this study, laser powder bed fusion (PBF-LB) of β-21S and the effect of post-PBF-LB heat treatment were investigated to understand the relationship between the microstructure and the mechanical properties. The as-built (AB) alloy is primarily composed of β-phase, with columnar grains oriented along the build direction. The alloy AB presented a microhardness of 278 HV, a yield strength (YS) of 917 MPa, an ultimate tensile strength (UTS) of 946 MPa, and a ductility of 25.3% at room temperature (RT). Such properties are comparable to β-21S in solution treatment (ST) condition. Solution treatment and aging (STA) of the alloy precipitated the α-phase, increasing the microhardness to 380 HV, YS to 1281 MPa and UTS to 1348 MPa, while reducing the ductility to 6.5% at RT. The STA alloy presented a YS of 827 MPa, UTS of 923 MPa, and a ductility of 7.7%, at 450 °C. The thermal treatment applied to PBF-LB β-21S had a similar effect compared to β-21S fabricated by non-AM techniques. The properties obtained demonstrate that β-21S is a potential candidate for AM.

Vorheriger Artikel Effect of bimodal powder blends on part density and melt pool fluctuation in laser powder bed fusion

Nächster Artikel Microstructure characterization of WC-9.2wt%Monel 400 fabricated using laser engineered net shaping

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Titel: Microstructure and mechanical properties of β-21S Ti alloy fabricated through laser powder bed fusion
verfasst von: Maria Argelia Macias-Sifuentes
Chao Xu
Oscar Sanchez-Mata
Sun Yong Kwon
Sila Ece Atabay
Jose Alberto Muñiz-Lerma
Mathieu Brochu
Publikationsdatum: 18.04.2021
Verlag: Springer International Publishing
Erschienen in: Progress in Additive Manufacturing / Ausgabe 3/2021
Print ISSN: 2363-9512
Elektronische ISSN: 2363-9520
DOI: https://doi.org/10.1007/s40964-021-00181-7

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