Modeling of interstitials diffusion during debinding/sintering of 3D printed metallic filaments: Application to titanium alloy and its embrittlement

Coffigniez, M.; Grémillard, Laurent; Perez, Michel; Simon, Sven; Rigollet, Christophe; Bonjour, E.; Jame, P.; Boulnat, Xavier

doi:10.1016/j.actamat.2021.117224

Cited by 15 publications

(6 citation statements)

References 48 publications

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“…Slipping of one half of the specimen relative to the other occurs along this crack. This behavior is similar to what has been previously observed for samples debinded at

500^{\circ}

, [ 63 ] for which a high equivalent oxygen content led to a low ductility. In the case of samples containing only coarse powder, a crack at

45^{\circ}

might appear in a corner (it has been observed only in one sample) but is not able to cross the whole sample.…”

Section: Resultssupporting

confidence: 90%

“…However, oxygen uptake was far larger, even higher than the one observed in samples obtained with a non‐optimized debinding treatment. [ 63 ] The oxygen uptake along the whole process was indeed evaluated at roughly 8500 ppm (+ 0.85 wt% between the initial and the final state) for the fine powder, against 1000 ppm (0.1 wt%) for the coarse. This leads to the final oxygen content of 0.220 wt% in samples completely made from a coarse powder only, against 1.2–1.3 wt% in samples containing only fine powder.…”

Section: Resultsmentioning

confidence: 99%

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Sinter‐Based Additive Manufacturing of Graded Porous Titanium Scaffolds by Multi‐Inks 3D Extrusion

2022

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A 3D printing approach to design and produce cellular scaffolds with a precise tunable pore architecture, in terms of size, fraction, and interconnectivity is reported. Different metallic inks are formulated by mixing hydrogel with Ti–6Al–4V atomized powders of various sizes. After 3D printing by direct‐ink writing (DIW) followed by debinding and sintering, the fraction and size of macropores (, designed by computer‐aided design (CAD)) and micropores (, remaining after sintering), the roughness and the microstructure are determined by high‐resolution X‐ray tomography and electron microscopy, and correlated to the initial powder size. It is shown that playing with initial powder size allows designing different pore architectures, from interconnected micropores to fully dense filaments. These phenomena are combined with a multi‐inks DIW approach to fabricate architectured structures with graded microporosity. This new route is promising for the production of functional materials, such as biomedical scaffolds or implants, with tunable osseointegration, stiffness, and strength. The micropores could also be loaded with active molecules and positioned according to release needs.

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“…Slipping of one half of the specimen relative to the other occurs along this crack. This behavior is similar to what has been previously observed for samples debinded at

500^{\circ}

, [ 63 ] for which a high equivalent oxygen content led to a low ductility. In the case of samples containing only coarse powder, a crack at

45^{\circ}

might appear in a corner (it has been observed only in one sample) but is not able to cross the whole sample.…”

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Sinter‐Based Additive Manufacturing of Graded Porous Titanium Scaffolds by Multi‐Inks 3D Extrusion

2022

Self Cite

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“…the final microstructure after sintering was characterized [19] and the effect of the sintering temperature and time on the porosity has been studied [20]. Similar investigations have been performed for other metals like Mg alloys [21], Ti and its alloys [22][23][24][25][26], or Cu [27,28].…”

Section: Introductionmentioning

confidence: 95%

Filament Extrusion-Based Additive Manufacturing of 316l Stainless Steel: Effects of Sintering Conditions on the Microstructure and Mechanical Properties

Wagner,

Engel,

Hadian

et al. 2022

SSRN Journal

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“…[ 7 ] However, they suffer some limitations related to the accuracy of the printed part and to the de‐binding and sintering steps that may leave behind unwanted reaction by‐products and residual porosity. [ 3,4,8 ]…”

Section: Introductionmentioning

confidence: 99%

“…[7] However, they suffer some limitations related to the accuracy of the printed part and to the de-binding and sintering steps that may leave behind unwanted reaction by-products and residual porosity. [3,4,8] In the ISO-ASTM 52 900 standard, [9] direct ink writing (DIW) is defined as an extrusion-based AM technology operated at room temperature. In DIW, a continuous flow of ink is extruded through a nozzle to deposit a spatially controlled filament of material.…”

Section: Introductionmentioning

confidence: 99%

Ink Tuning for Direct Ink Writing of Planar Metallic Lattices

2023

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316L and Cu‐based inks are developed to 3D‐printed tetrachiral auxetic structures. The main objectives of the work are to study the effects of powders composition and powder:binder volume ratio on rheological properties and printability of the inks. Following these results, customized Gcode is developed using FullControl Gcode Designer open‐source software to 3D print intricate tetrachiral auxetic structures. The results reported in this work show how powder composition (316L versus Cu) has less effect on the inks’ rheological behavior than powder size distribution and powders:binder volume ratio. In terms of rheological parameters, the zero‐shear rate viscosity mainly affects the capability of the printed ink to retain its shape after printing, while the yield stress affects the printability. The printed and sintered auxetic structures achieve the intended lattice‐geometry design.

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Modeling of interstitials diffusion during debinding/sintering of 3D printed metallic filaments: Application to titanium alloy and its embrittlement

Cited by 15 publications

References 48 publications

Sinter‐Based Additive Manufacturing of Graded Porous Titanium Scaffolds by Multi‐Inks 3D Extrusion

Sinter‐Based Additive Manufacturing of Graded Porous Titanium Scaffolds by Multi‐Inks 3D Extrusion

Filament Extrusion-Based Additive Manufacturing of 316l Stainless Steel: Effects of Sintering Conditions on the Microstructure and Mechanical Properties

Ink Tuning for Direct Ink Writing of Planar Metallic Lattices

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