Ti-6Al-4V ELI microlattice structures manufactured by electron beam melting: Effect of unit cell dimensions and morphology on mechanical behaviour

Epasto, Gabriella; Palomba, Giulia; D’Andrea, Danilo; Guglielmino, Eugenio; Bella, Santo Di; Traina, Francesco

doi:10.1016/j.msea.2019.03.014

Cited by 65 publications

(35 citation statements)

References 24 publications

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“…It is worth noting that on machined specimens surface defects are absent and roughness is very low. In [44] layers 1 mm thick were removed by some milling passes from massive flat specimens (7 mm thick): by this way a ductility equal to 18% was obtained in tensile test. Regarding internal defects, some porosity and voids were already observed in Reference [45].…”

Section: Surface and Internal Inspectionsmentioning

confidence: 99%

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Aliprandi

Giudice

Guglielmino

et al. 2019

Metals

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Thanks to their excellent mechanical strength in combination with low density, high melting point, and good resistance to corrosion, titanium alloys are very useful in many industrial and biomedical fields. The new additive manufacturing methods, such as Electron Beam Powder Bed Fusion based on the deposition of metal powders layers progressively molten by electron beam scanning, can overcome many of the machining problems concerning the production of peculiar shapes made of Ti alloys. However, the processing route is strictly determinant for mechanical performance of products, especially in the case of Ti alloys. In the present work flat specimens made of Ti-6Al-4V alloy produced by Electron Beam Powder Bed Fusion (or Electron Beam Melting) have been built and post-processed with the purpose of obtaining good tensile and creep performance. Preliminarily, the process parameters were set according to literature evidence and machine producer recommendations, validated by the results of a thermal analysis, aimed at satisfying the best processing conditions to reduce defects, as unmelted regions, microstructure coarsening or porosity, that are detrimental to mechanical behavior. Subsequently, Hot Isostatic Pressing and surface smoothing were considered, respectively, in order to reduce any internal porosity and lower roughness. Microstructure of the investigated specimens was characterized by optical and scanning electron microscopy observations and by X-ray diffraction measurements. Results show enhanced tensile behavior after the hot pressing treatment that allows to relieve stresses and reduce defects detrimental to mechanical properties. The best ductility was obtained by the combined effects of machining and densification. Creep test results verify the beneficial effects of surface smoothing.

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Section: Surface and Internal Inspectionsmentioning

confidence: 99%

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Aliprandi

Giudice

Guglielmino

et al. 2019

Metals

Self Cite

View full text Add to dashboard Cite

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“…因此, 许多研究者们采用选择性激光熔融技术制备了各类胞元周期性分布的点阵结构, 如立方胞元、 G7胞元、菱形十二面体胞元 [7] 、体心胞元和面心胞元 [8] . 大量研究已通过实验和理论的方式, 发现点阵结构的力学性能和变形行为可被许多因素影响(如胞元拓扑 [7] 、体积分数 [9] 和胞元尺寸 [10] ). Al-Ketan等人比于弯曲主导的结构, 拉伸主导的结构呈现出更高的刚度和强度.…”

Section: 伴随着增材制造技术的出现和发展制备各种各unclassified

Uniaxial compression mechanical behavior of Ti-6Al-4V hollow lattice structures

Ren¹,

Shen²,

Li³

2021

Sci. Sin.-Tech.

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“…As far as the response of lattice structure to heat treatment is concerned, far too little attention has been paid. As an example, Epasto et al [42] studied the compressive behaviour of Ti-6Al-4V cellular structures manufactured by EBM, which were heat-treated to reduce residual stress. They concluded that the possible presence of residual stresses does not significantly affect the compressive behaviour of Ti-6Al-4V lattice structures manufactured by the EBM process.…”

Section: Introductionmentioning

confidence: 99%

Electron Beam Melting of Ti-6Al-4V Lattice Structures; Correlation between Post Heat Treatment and Mechanical Properties

Guercio

Galati

Saboori

2021

Preprint

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Additive Manufacturing processes are considered advanced manufacturing methods. It would be possible to produce complex shape components from a Computer-Aided Design model in a layer-by-layer manner. Lattice structures as one of the complex geometries could attract lots of attention for both medical and industrial applications. In these structures, besides cell size and cell type, the microstructure of lattice structures can play a key role in these structures' mechanical performance. On the other hand, heat treatment has a significant influence on the mechanical properties of the material. Therefore, in this work, the effect of the heat treatments on the microstructure and mechanical behaviour of Ti-6Al-4V lattice structures manufactured by EBM was analyzed. The main mechanical properties were compared with the Ashby and Gibson model. It is very interesting to notice that a more homogeneous failure mode was found for the heat-treated samples. The structures' relative density was the main factor influencing their mechanical performance of the heat-treated samples. It is also found that the heat treatments were able to preserve the stiffness and the compressive strength of the lattice structures. Besides, an increment of both the elongation at failure and the absorbed energy was obtained after the heat treatments. Microstructure analysis of the heat-treated samples confirms the increment of ductility of the heat-treated samples with respect to the as-built one.

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Ti-6Al-4V ELI microlattice structures manufactured by electron beam melting: Effect of unit cell dimensions and morphology on mechanical behaviour

Cited by 65 publications

References 24 publications

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Uniaxial compression mechanical behavior of Ti-6Al-4V hollow lattice structures

Electron Beam Melting of Ti-6Al-4V Lattice Structures; Correlation between Post Heat Treatment and Mechanical Properties

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