Microstructure and tensile properties of selectively laser-melted and of HIPed laser-melted Ti–6Al–4V

Qiu, Chunlei; Adkins, Nicholas J.E.; Attallah, Moataz M.

doi:10.1016/j.msea.2013.04.099

Cited by 671 publications

(354 citation statements)

References 18 publications

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“…The microstructure evolution of SLM Ti-6Al-4V processed in various conditions such as asbuilt, stress relieved, and solution treated has been previously reported in the literature [14,15,19,[21][22][23]. The main microstructural features, in particular, porosity, prior-β grain boundaries, existing phases, and crystallographic texture will be described as they have a great influence on the mechanical behaviour and crack propagation in Ti alloys [30,31].…”

Section: Microstructure and Texture Of As-built Parts And Stress Relimentioning

confidence: 79%

“…As the elongation at break is inversely proportional to ' ( , where L and A are the initial gauge length and cross-sectional area respectively (ASTM E8/E8M), flat samples showed a reduction in strength and ductility [45]. Because of the possibility of interlayer porosity that can occur during SLM, it was not surprising that the vertical barsconsisting of the highest number of layers -have the lowest yield strength and UTS [17,19].…”

Section: Anisotropy Of Slm Ti-6al-4v: Tensile Properties Of Samples Wmentioning

confidence: 99%

“…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%

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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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Section: Microstructure and Texture Of As-built Parts And Stress Relimentioning

confidence: 79%

Section: Anisotropy Of Slm Ti-6al-4v: Tensile Properties Of Samples Wmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Selective laser melting (SLM) is an AM technology that may be used to manufacture metal components [22], [23], [24] and [25]. During this process, a focused laser beam is used to selectively heat a bed of metallic powder above the materials melting point causing the particles to melt and fuse together.…”

mentioning

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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“…Compared to conventional production techniques (casting, cold working, machining, etc. ), 3D printing technology such as SLM has nearly no waste materials, has fewer production stages and can easily apply design changes, which makes it one of the most highly regarded technologies in various fields [2]. SLM has the advantage of excellent dimension accuracy and a fast cooling rate (10 5 ~ 10 8 K/s) compared to other E-beam melting (EBM) and direct energy deposition (DED) 3D printing processes [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process

Lee¹,

Kim²,

Yu³

et al. 2017

Archives of Metallurgy and Materials

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This study manufactured Ti-6Al-4V alloy using one of the powder bed fusion 3D-printing processes, selective laser melting, and investigated the effect of heat treatment (650°C/3hrs) on microstructure and impact toughness of the material. Initial microstructural observation identified prior-β grain along the building direction before and after heat treatment. In addition, the material formed a fully martensite structure before heat treatment, and after heat treatment, α and β phase were formed simultaneously. Charpy impact tests were conducted. The average impact energy measured as 6.0 J before heat treatment, and after heat treatment, the average impact energy increased by approximately 20% to 7.3 J. Fracture surface observation after the impact test showed that both alloys had brittle characteristics on macro levels, but showed ductile fracture characteristics and dimples at micro levels.

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Microstructure and tensile properties of selectively laser-melted and of HIPed laser-melted Ti–6Al–4V

Cited by 671 publications

References 18 publications

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

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

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

Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process

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