Selective laser melting of Ti6Al7Nb with hydroxyapatite addition

Marcu, Teodora; Menapace, C.; Girardini, L.; Leordean, Dan; Popa, Cătălin

doi:10.1108/rpj-09-2012-0083

Cited by 15 publications

(9 citation statements)

References 13 publications

(24 reference statements)

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“…Localized re-melting and re-cooling cycles lead to the formation of columnar β phase grains, which are inclined perpendicular to the laser scanning plane [50,53] . These thermal gradients will cause the part to have residual thermal stresses and non-equilibrium phases [54] . Residual stresses must be relieved prior to usage, necessitating post-processing techniques such as stress relieving and/or HIP to reduce the internal stresses and increase the fatigue resistance of parts to that comparable with conventionally fabricated equivalents [52] .…”

Section: Slm Part Propertiesmentioning

confidence: 99%

Additive Manufacturing of Titanium Alloys for Orthopedic Applications: A Materials Science Viewpoint

et al. 2018

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Titanium‐based orthopedic implants are increasingly being fabricated using additive manufacturing (AM) processes such as selective laser melting (SLM), direct laser deposition (DLD), and electron beam melting (EBM). These techniques have the potential to not only produce implants with properties comparable to conventionally manufactured implants, but also improve on standard implant models. These models can be customized for individual patients using medical data, and design features, such as latticing, hierarchical scaffolds, or features to complement patient anatomy, can be added using AM to produce highly functional patient‐anatomy‐specific implants. Alloying prospects made possible through AM allow for the production of Ti‐based parts with compositions designed to reduce modulus and stress shielding while improving bone fixation and formation. The design‐to‐process lead time can be drastically shortened using AM and associated post‐processing, making possible the production of tailored implants for individual patients. This review examines the process and product characteristics of the three major metallic AM techniques and assesses the potential for these in the increased global uptake of AM in orthopedic implant fabrication.

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Section: Slm Part Propertiesmentioning

confidence: 99%

Additive Manufacturing of Titanium Alloys for Orthopedic Applications: A Materials Science Viewpoint

et al. 2018

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“…Because the SLM process involves heat transfer, remelting, and other thermo-physical behaviors, typical defects could occur in the Ti6Al7Nb lattice structures. Some of the typical manufacturing defects refer to the balling effect, micro-cracks, heat-affected zone, and residual stress phenomena [ 1 , 41 , 42 , 43 ]. To limit these issues, adapted process parameters are needed for a stable fabrication of lattice structures made of Ti6Al7Nb.…”

Section: Methodsmentioning

confidence: 99%

“…To limit these issues, adapted process parameters are needed for a stable fabrication of lattice structures made of Ti6Al7Nb. After examining the literature recommendations regarding the SLM process parameters which could be proper for Ti6Al7Nb powder [ 20 , 35 ], and based on our previous studies [ 42 , 44 , 45 , 46 ], we programmed and tested more than 10 laser parameters. To have an efficient production speed, the layer thickness was maintained constant at 50 µm.…”

Section: Methodsmentioning

confidence: 99%

Physical–Mechanical Characteristics and Microstructure of Ti6Al7Nb Lattice Structures Manufactured by Selective Laser Melting

et al. 2020

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The demand of lattice structures for medical applications is increasing due to their ability to accelerate the osseointegration process, to reduce the implant weight and the stiffness. Selective laser melting (SLM) process offers the possibility to manufacture directly complex lattice applications, but there are a few studies that have focused on biocompatible Ti6Al7Nb alloy. The purpose of this work was to investigate the physical–mechanical properties and the microstructure of three dissimilar lattice structures that were SLM-manufactured by using Ti6Al7Nb powder. In particular, the strut morphology, the fracture characterization, the metallographic structure, and the X-ray phase identification were analyzed. Additionally, the Gibson-Ashby prediction model was adapted for each lattice topology, indicating the theoretical compressive strength and Young modulus. The resulted porosity of these lattice structures was approximately 56%, and the pore size ranged from 0.40 to 0.91 mm. Under quasi-static compression test, three failure modes were recorded. Compared to fully solid specimens, the actual lattice structures reduce the elastic modulus from 104 to 6–28 GPa. The struts surfaces were covered by a large amount of partial melted grains. Some solidification defects were recorded in struts structure. The fractographs revealed a brittle rupture of struts, and their microstructure was mainly α’ martensite with columnar grains. The results demonstrate the suitability of manufacturing lattice structures made of Ti6Al7Nb powder having unique physical–mechanical properties which could meet the medical requirements.

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“…For the Ti-6Al-4V alloy, the best accuracy was obtained at laser power 95 W, layer thickness 30 mm, scan speed 125 mm/s, hatching space 130 mm and energy density 195 J/mm 3 [25]. The composite Ti-6Al-7Nb and hydroxyapatite were manufactured with a laser power of 50 W [26].…”

Section: Introductionmentioning

confidence: 99%

Determinants of the surface quality, density and dimensional correctness in selective laser melting of the Ti-13Zr-13Nb alloy

Seramak

Zasińska

Mesnard

et al. 2018

Matériaux & Techniques

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Selective laser melting is widely used for custom-designed elements. Successful manufacturing depends on laser treatment parameters and material features. This research aimed to determine the effects of laser power, scan time and hatch distance on surface quality, relative density and dimensional precision for cuboids made of the Ti-13Zr-13Nb alloy. The influence of energy density, energy flux and pre-heating was seen to be decisive to different degrees for the quality of the final specimen. The results obtained were used to produce prosthetic crowns and bridges. The thermal stresses that appeared resulted in a deflection of the bridges and consequently in a change in design approach.

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Selective laser melting of Ti6Al7Nb with hydroxyapatite addition

Cited by 15 publications

References 13 publications

Additive Manufacturing of Titanium Alloys for Orthopedic Applications: A Materials Science Viewpoint

Additive Manufacturing of Titanium Alloys for Orthopedic Applications: A Materials Science Viewpoint

Physical–Mechanical Characteristics and Microstructure of Ti6Al7Nb Lattice Structures Manufactured by Selective Laser Melting

Determinants of the surface quality, density and dimensional correctness in selective laser melting of the Ti-13Zr-13Nb alloy

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