Laser powder bed fusion parameters to produce high-density Ti–53%Nb alloy using irregularly shaped powder from hydride-dehydride (HDH) process

Guzmán, Jhoan; Nobre, Rafael de Moura; Nunes, Enzo R.; Bayerlein, Daniel Leal; Falcão, Railson Bolsoni; Sallica-Leva, Edwin; Neto, João Batista Ferreira; Oliveira, Henrique Rodrigues; Chastinet, Victor Lira; Landgraf, Fernando José Gomes

doi:10.1016/j.jmrt.2020.12.084

Cited by 22 publications

(10 citation statements)

References 50 publications

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“…Many studies on the solidification microstructure in the additive manufacturing of Ti–Nb-based alloys have shown that melt pool boundaries can be observed due to segregation. In particular, Guzmán et al reported that the darker cellular walls in the BSE images of the Ti–53 wt % Nb alloy produced by L-PBF indicated the presence of the regions with a high titanium content . Present observations of the darker cellular regions are due to the segregation, which is supported by the results reported in our previous study, where TEM images of the as-manufactured TNZT alloy presented the α phase.…”

Section: Resultssupporting

confidence: 88%

Combined First-Principles and Experimental Study on the Microstructure and Mechanical Characteristics of the Multicomponent Additive-Manufactured Ti–35Nb–7Zr–5Ta Alloy

et al. 2023

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New β-stabilized Ti-based alloys are highly promising for bone implants, thanks in part to their low elasticity. The nature of this elasticity, however, is as yet unknown. We here present combined first-principles DFT calculations and experiments on the microstructure, structural stability, mechanical characteristics, and electronic structure to elucidate this origin. Our results suggest that the studied β Ti−35Nb−7Zr−5Ta wt % (TNZT) alloy manufactured by the electron-beam powder bed fusion (E-PBF) method has homogeneous mechanical properties (H = 2.01 ± 0.22 GPa and E = 69.48 ± 0.03 GPa) along the building direction, which is dictated by the crystallographic texture and microstructure morphologies. The analysis of the structural and electronic properties, as the main factors dominating the chemical bonding mechanism, indicates that TNZT has a mixture of strong metallic and weak covalent bonding. Our calculations demonstrate that the softening in the Cauchy pressure (C′ = 98.00 GPa) and elastic constant C̅ 44 = 23.84 GPa is the origin of the low elasticity of TNZT. Moreover, the nature of this softening phenomenon can be related to the weakness of the second and third neighbor bonds in comparison with the first neighbor bonds in the TNZT. Thus, the obtained results indicate that a carefully designed TNZT alloy can be an excellent candidate for the manufacturing of orthopedic internal fixation devices. In addition, the current findings can be used as guidance not only for predicting the mechanical properties but also the nature of elastic characteristics of the newly developed alloys with yet unknown properties.

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Section: Resultssupporting

confidence: 88%

Combined First-Principles and Experimental Study on the Microstructure and Mechanical Characteristics of the Multicomponent Additive-Manufactured Ti–35Nb–7Zr–5Ta Alloy

et al. 2023

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“…This perhaps comes to explain partially why there is a bias in perspective between the two camps. It has been shown that nonspherical powders produced using the hydride–dehydride process have been successfully printed. , …”

Section: Discussionmentioning

confidence: 99%

“…It has been shown that nonspherical powders produced using the hydride−dehydride process have been successfully printed. 18,19 As the manufacturing process becomes better understood, the requirements of the particles should as well. What PBF, BJP, sintering, directed energy deposition (DED) powder, and cold spray require are different attributes of the powder feedstock.…”

Section: ■ Summary and Conclusionmentioning

confidence: 99%

Additive Manufacturing: Incremental Improvements to a Disruptive Technology

Barnes¹,

Slattery²

2021

Acc. Mater. Res.

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“…1. Table 1 presents the characteristics of specific mass (q), calculated by x-ray diffraction in previous work (Ref 49,51); apparent density (q a ) and flowability, measured in Hall Flowmeter funnel; and particle size distributions, measured by laser diffraction (Malvern, Mastersizer 2000) and also shown in Fig. 2.…”

Section: Powder Characterizationmentioning

confidence: 99%

Comparing Spherical and Irregularly Shaped Powders in Laser Powder Bed Fusion of Nb47Ti Alloy

Guzmán

Nobre

Júnior

et al. 2021

J. of Materi Eng and Perform

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Literature reports that irregularly shaped powder has lower flowability and apparent density than spherical shaped powder, factors that hinder its use in additive manufacturing, although its cost is potentially lower. In this study, four samples of Nb47Ti alloy manufactured by laser powder bed fusion from plasma atomized (PA) and hydride-dehydride (HDH) powders with different scanning strategies and interstitial element content were compared. Laser power levels of 200 W and 300 W were investigated. To keep a constant powder mass under the laser beam, the processing table displacement for samples from the HDH powder was twice larger than the 30 lm used for samples from the PA powder procedure, due to the lower apparent density of the HDH powder. It was possible to achieve porosity levels below 1% with both powders. However, the power of 200 W generated 13% of porosity in the HDH samples. A similar microstructure formed by melt pools and cellular dendritic structure in a b phase matrix of body-centered cubic (BCC) structure was obtained in all samples. Furthermore, the low interstitial element content of samples from PA powder resulted in lower microhardness when compared to the higher interstitial element content of samples from HDH powder. Keywords hydride-dehydride (HDH) powder, laser powder bed fusion (l-PBF), microstructure, Nb47Ti (Ti-53%Nb), plasma atomized (PA) powder, porosity This invited article is part of a special topical focus in the Journal of Materials Engineering and Performance on Additive Manufacturing.

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Laser powder bed fusion parameters to produce high-density Ti–53%Nb alloy using irregularly shaped powder from hydride-dehydride (HDH) process

Cited by 22 publications

References 50 publications

Combined First-Principles and Experimental Study on the Microstructure and Mechanical Characteristics of the Multicomponent Additive-Manufactured Ti–35Nb–7Zr–5Ta Alloy

Combined First-Principles and Experimental Study on the Microstructure and Mechanical Characteristics of the Multicomponent Additive-Manufactured Ti–35Nb–7Zr–5Ta Alloy

Additive Manufacturing: Incremental Improvements to a Disruptive Technology

Comparing Spherical and Irregularly Shaped Powders in Laser Powder Bed Fusion of Nb47Ti Alloy

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