Effects of processing parameters on microstructure and mechanical property of selective laser melted Ti6Al4V

Song, Bo; Dong, Shujuan; Zhang, Baicheng; Liao, Hanlin; Coddet, Christian

doi:10.1016/j.matdes.2011.09.051

Cited by 370 publications

(170 citation statements)

References 22 publications

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“…Accordingly, the SLM-parts show a far lower deviation from a theoretical smooth surface that can be considered an indicator for a stable and accurate manufacturing process. Besides powder size distribution, the layer thickness in the powder feed and the powder bed system, the laser beam diameter itself has an influence on surface roughness [13]. Higher roughness values of EBM parts are typically due to the process parameters.…”

Section: Vickers Hardnessmentioning

confidence: 99%

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Comparison of Single Ti6Al4V Struts Made Using Selective Laser Melting and Electron Beam Melting Subject to Part Orientation

Weißmann

Drescher

Bader

et al. 2017

Metals

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Abstract:The use of additive manufacturing technologies to produce lightweight or functional structures is widespread. Especially Ti 6 Al 4 V plays an important role in this development field and parts are manufactured and analyzed with the aim to characterize the mechanical properties of open-porous structures and to generate scaffolds with properties specific to their intended application. An SLM and an EBM process were used respectively to fabricate the Ti 6 Al 4 V single struts. For mechanical characterization, uniaxial compression tests and hardness measurements were conducted. Furthermore, the struts were manufactured in different orientations for the determination of the mechanical properties. Roughness measurements and a microscopic characterization of the struts were also carried out. Some parts were characterized following heat treatment (hot isostatic pressing). A functional correlation was found between the compressive strength and the slenderness ratio (λ) as well as the equivalent diameter (d) and the height (L) of EBM and SLM parts. Hardness investigations revealed considerable differences related to the microstructure. An influence of heat treatment as well as of orientation could be determined. In this work, we demonstrate the influence of the fabrication quality of single struts, the roughness and the microstructure on mechanical properties as a function of orientation.

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Section: Vickers Hardnessmentioning

confidence: 99%

“…The geometrical shape as well as the properties of the structures produced can be influenced directly through the manufacturing parameters [11][12][13] and through heat treatment [14,15].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Single Ti6Al4V Struts Made Using Selective Laser Melting and Electron Beam Melting Subject to Part Orientation

Weißmann

Drescher

Bader

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

“…4b) are commonly observed with partial powder melting, which occurs if the energy input is insufficient to induce significant melting of the powder particles. Song et al demonstrated that laser power and scanning speed strongly effect the processing mechanism (melting with cracks, continuous melting, and partial melting), which in turn affects surface topology, part density, and micro-hardness [37]. The inherent micro-roughness of SLM parts may be advantageous to cell adhesion and differentiation [38], however, this surface topography is known to limit fatigue performance [26].…”

Section: 1mentioning

confidence: 99%

Adding functionality with additive manufacturing: Fabrication of titanium-based antibiotic eluting implants

Cox

Jamshidi

Eisenstein

et al. 2016

Materials Science and Engineering: C

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Additive manufacturing technologies have been utilised in healthcare to create patient-specific implants. This study demonstrates the potential to add new implant functionality by further exploiting the design flexibility of these technologies. Selective laser melting was used to manufacture titanium-based (Ti-6Al-4V) implants containing a reservoir. Pore channels, connecting the implant surface to the reservoir, were incorporated to facilitate antibiotic delivery. An injectable brushite, calciumphosphate cement, was formulated as a carrier vehicle for gentamicin. Incorporation of the antibiotic significantly (p=0.01) improved the compressive strength (5.8± 0.7 MPa) of the cement compared to non-antibiotic samples. The controlled release of gentamicin sulphate from the calcium phosphate cement injected into the implant reservoir was demonstrated in short term elution studies using ultraviolet visible spectroscopy. Orientation of the implant pore channels were shown, using micro-computed tomography, to impact design reproducibility and the back-pressure generated during cement injection which ultimately altered porosity. The amount of antibiotic released from all implant designs over a 6 hour period (b28% of the total amount) were found to exceed the minimum inhibitory concentrations of Staphylococcus aureus (16 μg/mL) and Staphylococcus epidermidis (1 μg/mL); two bacterial species commonly associated with periprosthetic infections. Antibacterial efficacy was confirmed against both bacterial cultures using an agar diffusion assay. Interestingly, pore channel orientation was shown to influence the directionality of inhibition zones. Promisingly, this work demonstrates the potential to additively manufacture a titanium-based antibiotic eluting implant, which is an attractive alternative to current treatment strategies of periprosthetic infections.

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“…Parts with mechanical properties comparable to those of the conventionally manufactured titanium alloys have also been reported [15,16]. As the process stability has shown to be crucial for the production of near fully dense products, most of the studies of CP-Ti and α/β Ti alloys manufactured by SLM have focussed primarily on the densification mechanisms during the fabrication process [17][18][19][20]. Indeed, it has been reported that by combining suitable scan strategy and high laser energy density, it is possible to reduce significantly the volume fraction of defects (i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti–6Al–4V

Simonelli

Tse

Tuck

2014

Materials Science and Engineering: A

776

288

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originates from the AM process. To understand the effect of the microstructure on the tensile properties, selective laser melted (SLM) Ti-6Al-4V samples built in three different orientations were tensile tested. The investigated samples were near fully dense, in two distinct conditions, as-built and stress relieved respectively. It was found that the build orientation affects the tensile properties, and in particular the ductility of the samples. The mechanical anisotropy of the parts was discussed in relation to the crystallographic texture, phase composition and the predominant fracture mechanisms. Fractography and electron backscatter diffraction (EBSD) results indicate that the predominant fracture mechanism is 2 intergranular fracture along the grain boundaries present and thus provide and explanation for the typical fracture surface features observed in fracture AM Ti-6Al-4V.

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Effects of processing parameters on microstructure and mechanical property of selective laser melted Ti6Al4V

Cited by 370 publications

References 22 publications

Comparison of Single Ti6Al4V Struts Made Using Selective Laser Melting and Electron Beam Melting Subject to Part Orientation

Comparison of Single Ti6Al4V Struts Made Using Selective Laser Melting and Electron Beam Melting Subject to Part Orientation

Adding functionality with additive manufacturing: Fabrication of titanium-based antibiotic eluting implants

Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti–6Al–4V

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