Effects of scan line spacing on pore characteristics and mechanical properties of porous Ti6Al4V implants fabricated by selective laser melting

Zhang, Sheng; Wei, Qingsong; Cheng, Lingyu; Li, Suo; Shi, Yusheng

doi:10.1016/j.matdes.2014.05.021

Cited by 190 publications

(90 citation statements)

References 35 publications

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“…As seen from the figure, with an increase in the energy density, more material is melted, void fraction is quickly reduced, especially when the energy density exceeds 70 J/mm 3 . A similar result can be acquired from the calculation results by different research groups on energy density calculation for the SLM fabricated titanium parts, but the appropriate energy density is different due to different materials [7,22,28,[47][48][49][50][51][52]. Conversely, the crack density shows a slight increase with the increase in energy density due to the large thermal stress caused by the excessive energy input.…”

Section: Effect Of Laser Energy Inputsupporting

confidence: 62%

Defect Formation Mechanisms in Selective Laser Melting: A Review

Zhang

Bai

2017

Chin. J. Mech. Eng.

666

307

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Defect formation is a common problem in selective laser melting (SLM). This paper provides a review of defect formation mechanisms in SLM. It summarizes the recent research outcomes on defect findings and classification, analyzes formation mechanisms of the common defects, such as porosities, incomplete fusion holes, and cracks. The paper discusses the effect of the process parameters on defect formation and the impact of defect formation on the mechanical properties of a fabricated part. Based on the discussion, the paper proposes strategies for defect suppression and control in SLM.

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Section: Effect Of Laser Energy Inputsupporting

confidence: 62%

Defect Formation Mechanisms in Selective Laser Melting: A Review

Zhang

Bai

2017

Chin. J. Mech. Eng.

666

307

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“…This phenomenon causes deviations from the present geometry as well as porosity deviations. The effect of powder adhesion is also described in [62].…”

Section: Discussionmentioning

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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“…The exact amount has to be investigated for every material. Zhang et al [39] suggested using three times bigger pore sizes. Furthermore, as reported by several authors [52][53][54][55][56][57][58], the difference between the realized and planned diameter of struts is a function of strut inclination.…”

Section: Finite Size Powder Problemmentioning

confidence: 99%

“…The effect of spacing between parallel laser scans (a.k.a. hatch spacing) on manufacturability was studied by Zhang et al [39]. They concluded that hatch spacing must be greater than the laser spot size.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of the printable density range of lattice structures for additive manufacturing

2017

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Structured cellular structures are nowadays printed using additive manufacturing methods like powder bed fusion. The relative density of the cellular structures has a big role in the suitability of a lattice for printing due to the minimum printable radius constraint and powder being trapped inside an inclusion. In this work, the theoretical limits of the printable range of relative density of different lattice types are found based on the cell size using computer methods by leaving other process parameters for further research as the current parameters are the most basic ones. The results are approximated using simple polynomials to enable practical usage.

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Effects of scan line spacing on pore characteristics and mechanical properties of porous Ti6Al4V implants fabricated by selective laser melting

Cited by 190 publications

References 35 publications

Defect Formation Mechanisms in Selective Laser Melting: A Review

Defect Formation Mechanisms in Selective Laser Melting: A Review

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

Numerical prediction of the printable density range of lattice structures for additive manufacturing

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