On the surface integrity of Electron Beam Melted Ti6Al4V after machining

Bertolini, Rachele; Lizzul, Lucia; Bruschi, Stefania; Ghiotti, Andrea

doi:10.1016/j.procir.2019.04.166

Cited by 18 publications

(8 citation statements)

References 14 publications

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“…In the case of cylindrical turning, the spiked peaks resulted in greater Spk and Ssk values, being the majority of the material located below the core roughness. This finding can be attributed to the lower cutting temperatures of the cryogenic condition, which hindered the local softening of the material peaks, confirming what was found in previous works on cryogenic machining [ 30 , 31 ]. The effect of the cryogenic cooling condition on the surface topography was especially observed between comparing the textures of the two cutting directions.…”

Section: Resultssupporting

confidence: 89%

Turning of Additively Manufactured Ti6Al4V: Effect of the Highly Oriented Microstructure on the Surface Integrity

2021

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Additive manufacturing processes induce a high orientation in the microstructure of the printed part due to the strong thermal gradients developed during the process caused by the highly concentrated heat source that is used to melt the metal powder layer-by-layer. The resulting microstructural anisotropy may have an effect on the post-processing operations such as machining ones. This paper investigates the influence of the anisotropy in turning operations carried out on laser powder bed fused Ti6Al4V parts manufactured with different scanning strategies. The machinability under both transverse and cylindrical turning operations was assessed in terms of surface integrity, considering both surface and sub-surface aspects. The effect of the different cooling conditions, that is flood and cryogenic ones, was studied as well. The outcomes showed that the microstructural anisotropy had a remarkable effect on the machining operations and that the cryogenic cooling enhanced the effect of the anisotropy in determining the surface integrity.

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Section: Resultssupporting

confidence: 89%

Turning of Additively Manufactured Ti6Al4V: Effect of the Highly Oriented Microstructure on the Surface Integrity

2021

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“…In this regard, various studies have evaluated alternative techniques to polish the surfaces of parts manufactured by AM, with the purpose of improving their surface roughness and porosity, using fine abrasive finishing processes in horizontally- and vertically-manufactured parts [ 132 ]. Other studies have assessed the machinability of EBM-fabricated samples in assisted surface finishing treatments using different cooling techniques [ 133 ], [ 134 ]. The internal porosity defect can be reduced by subjecting samples to subsequent treatments such as hot isostatic pressing and other heat processes [ 135 ].…”

Section: Structure and Microstructure Of Ti6al4v Alloy Prototypes Obtained Via Electron Beam Meltingmentioning

confidence: 99%

Additive manufacturing of Ti6Al4V alloy via electron beam melting for the development of implants for the biomedical industry

Tamayo

Riascos

Vargas

et al. 2021

Heliyon

107

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Additive Manufacturing (AM) or rapid prototyping technologies are presented as one of the best options to produce customized prostheses and implants with high-level requirements in terms of complex geometries, mechanical properties, and short production times. The AM method that has been more investigated to obtain metallic implants for medical and biomedical use is Electron Beam Melting (EBM), which is based on the powder bed fusion technique. One of the most common metals employed to manufacture medical implants is titanium. Although discovered in 1790, titanium and its alloys only started to be used as engineering materials for biomedical prostheses after the 1950s. In the biomedical field, these materials have been mainly employed to facilitate bone adhesion and fixation, as well as for joint replacement surgeries, thanks to their good chemical, mechanical, and biocompatibility properties. Therefore, this study aims to collect relevant and up-to-date information from an exhaustive literature review on EBM and its applications in the medical and biomedical fields. This AM method has become increasingly popular in the manufacturing sector due to its great versatility and geometry control.

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“…The hard surface leads to higher surface roughness during processing. 21 For Ti alloy materials, the side with higher yield stress and hardness has lower ductility. 22 With evident plastic fluidity, the additive Ti6Al4V alloy has a large plastic deformation and higher surface upheavals.…”

Section: Surface Integritymentioning

confidence: 99%

Comparison of surface integrity of Ti6Al4V titanium alloy manufactured by laser deposition and traditional method after end milling

Wang

Zhang

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Ti alloy has been widely applied in aerospace due to its high strength, good corrosion resistance, and excellent high-temperature performances. The quality and usability of Ti alloy parts are closely related to surface integrity. In this study, a comparative analysis of the milling surface integrity between laser deposition manufacturing and traditional Ti6Al4V samples was conducted. End milling surfaces of additive and traditional Ti6Al4V samples were observed with an orthogonal experiment under different milling parameters from the perspectives of cutting force, surface morphology, surface roughness, subsurface damages, and microhardness. Results demonstrate that the additive Ti6Al4V sample has a slightly higher cutting force and surface roughness relative to traditional Ti6Al4V. This is related to the higher hardness and plasticity of the additive Ti6Al4V sample. There are unmelted powder particle defects on the milling surface of the additive Ti6Al4V sample and serious cracking defects on the subsurface of the additive Ti6Al4V sample. The microhardness of the work hardening layer and base of the additive Ti6Al4V sample is higher than that of traditional Ti6Al4V. Moreover, the additive Ti6Al4V sample presents higher work hardening and a larger depth of the hardening layer. These findings demonstrate that material properties and manufacturing processes can influence surface integrity significantly.

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On the surface integrity of Electron Beam Melted Ti6Al4V after machining

Cited by 18 publications

References 14 publications

Turning of Additively Manufactured Ti6Al4V: Effect of the Highly Oriented Microstructure on the Surface Integrity

Turning of Additively Manufactured Ti6Al4V: Effect of the Highly Oriented Microstructure on the Surface Integrity

Additive manufacturing of Ti6Al4V alloy via electron beam melting for the development of implants for the biomedical industry

Comparison of surface integrity of Ti6Al4V titanium alloy manufactured by laser deposition and traditional method after end milling

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