Predictive models for physical and mechanical properties of Ti6Al4V produced by Selective Laser Melting

Bartolomeu, F.; Faria, Susana; Carvalho, Ó.; Pinto, E.; Alves, Nuno; Silva, Filipe; Miranda, G.

doi:10.1016/j.msea.2016.03.113

Cited by 106 publications

(55 citation statements)

References 21 publications

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“…All parts were built using an identical energy density (J/mm³). The energy density E is defined by the following equation [41]: (1) where P is laser power, v is scan speed, d is hatch spacing and t is layer thickness.…”

Section: Fabrication Of the Scaffolds Via The Slm Process And The Ebmmentioning

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: Fabrication Of the Scaffolds Via The Slm Process And The Ebmmentioning

confidence: 99%

“…All parts were built using an identical energy density (J/mm 3 ). The energy density E is defined by the following equation [41]:…”

Section: Fabrication Of the Scaffolds Via The Slm Process And The Ebmmentioning

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

“…All parts were built using an identical energy density (J/mm 3 ). The energy density (E) is defined by the following equation [52]:…”

Section: Fabrication Of the Scaffolds Via An Slm Processmentioning

confidence: 99%

Specific Yielding of Selective Laser-Melted Ti6Al4V Open-Porous Scaffolds as a Function of Unit Cell Design and Dimensions

Weißmann

Wieding

Hansmann

et al. 2016

Metals

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Bone loss in the near-vicinity of implants can be a consequence of stress shielding due to stiffness mismatch. This can be avoided by reducing implant stiffness, i.e., by implementing an open-porous structure. Three open-porous designs were therefore investigated (cubic, pyramidal and a twisted design). Scaffolds were fabricated by a selective laser-melting (SLM) process and material properties were determined by conducting uniaxial compression testing. The calculated elastic modulus values for the scaffolds varied between 3.4 and 26.3 GP and the scaffold porosities between 43% and 80%. A proportional linear correlation was found between the elastic modulus and the geometrical parameters, between the elastic modulus and the compressive strengths, as well as between the strut width-to-diameter ratio (a/d) and elastic modulus. Furthermore, we found a power-law relationship between porosity and the modulus of elasticity that characterizes specific yielding. With respect to scaffold porosity, the description of specific yielding behaviour offers a simple way to characterize the mechanical properties of open-porous structures and helps generate scaffolds with properties specific to their intended application. A direct comparison with human bone parameters is also possible. We generated scaffolds with mechanical properties sufficiently close to that of human cortical bone.

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“…This interaction will increase the temperature, causing the particles to be sintered and the formation of a solid layer to occur . Laser sintering is a suitable technology for sintering materials in designated locations and other design‐production strategies …”

Section: Introductionmentioning

confidence: 99%

Ti6Al4V laser surface preparation and functionalization using hydroxyapatite for biomedical applications

et al. 2017

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This work presents a novel texture design for implants surface functionalization, through the creation of line-shaped textures on Ti6Al4V surfaces and subsequent sintering of hydroxyapatite (HAp) powder into the designated locations. HAp-rich locations were designed to avoid HAp detachment during insertion, thus guaranteeing an effective osseointegration. This process starts by creating textured lines using a Nd:YAG laser, filling these lines with HAp powder and sintering HAp using a CO laser. The adhesion of HAp is known to be influenced by HAp sintering parameters, especially laser power and scanning speed and also by the textured lines manufacturing. Different laser parameters combinations were used to assess the sintering and adhesion of HAp to the textured lines. HAp adhesion was assessed by performing high energy ultrasonic cavitation tests and sliding tests mimicking an implant insertion, with Ti6Al4V/HAp specimens sliding against animal bone. The HAp content retained after these tests was measured and results showed that an excellent HAp sintering and adhesion was achieved when using a scan speed of 1 mm/s and laser power between 9 and 9.6 W. It is important to emphasize that results indicated that the HAp bioactivity was maintained when using these conditions, validating this functionalization process for the production of hip prosthesis with improved bioactivity. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1534-1545, 2018.

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Predictive models for physical and mechanical properties of Ti6Al4V produced by Selective Laser Melting

Cited by 106 publications

References 21 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

Specific Yielding of Selective Laser-Melted Ti6Al4V Open-Porous Scaffolds as a Function of Unit Cell Design and Dimensions

Ti6Al4V laser surface preparation and functionalization using hydroxyapatite for biomedical applications

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