Effect of Process Parameters on Surface Integrity of LPBF Ti6Al4V

Simson, D.; Subbu, S. Kanmani

doi:10.1016/j.procir.2022.03.111

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…Spattering also inputs to surface roughness. The surface topography of the L-PBF sample is greatly affected by adhered partly melted powder particles and spatters onto the surface of the part [22]- [23]. Figure 6 shows the side surface morphology of L-PBF samples.…”

Section: Resultsmentioning

confidence: 99%

“…Track-by-track manufacturing causes peaks and valleys that might form waviness on the top surface. Ripples on the track happen when the surface tension exerts a shear force on the liquid surface [23]. The surface roughness of the L-PBF is not only affected by powder particles that adhered to the surface due to elevated local temperature and spattering, but the ripples also influence the roughness of the top surface.…”

Section: Resultsmentioning

confidence: 99%

“…The surface roughness of the L-PBF is not only affected by powder particles that adhered to the surface due to elevated local temperature and spattering, but the ripples also influence the roughness of the top surface. According to Simson [23], the fluid convection in the melt pool is the primary reason for the position of the adhered powder particles and thermocapillary convection and unsteady deformation of the free surface near the solidification front appears is responsible for the formation of rippling.…”

Section: Resultsmentioning

confidence: 99%

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Surface roughness of Ti6Al4V samples produced by laser powder bed fusion for bone implants

et al. 2022

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This study describes the surface roughness of heat-treated Ti6Al4V ELI samples without surface finishing (as-built condition) depending on the position of the build plate. Surface roughness was studied at the top and side surfaces of horizontal and vertical samples using a profilometer and Scanning Electron Microscopy. Morphology of tested samples is shown. It was shown that the top and side surfaces of vertical and horizontal samples had different morphologies, but they had fairly close roughness values, since the formation of roughness was mainly associated with sticking of the powder material both on the upper surface of the samples and on the side surfaces. It was found that samples that were far away from the argon inlet and recoater start line had higher surface roughness.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Surface roughness of Ti6Al4V samples produced by laser powder bed fusion for bone implants

et al. 2022

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“…Laser powder bed fusion (LPBF) is an additive manufacturing technology that uses a high-power laser to completely melt and consolidate subsequent powder layers for the direct fabrication of three-dimensional components. [6,7] In addition, the rapid melting of the material and the rapid solidification of the molten pool under the local action of the laser are repeated alternately, so that the formed components show the characteristics of nonequilibrium solidification structure with basically no chemical element segregation and extremely small grains. [8][9][10] Therefore, LPBF has attracted wide attention as a preparation method of metal matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Influence of laser energy density on the microstructure and corrosion resistance of LPBF‐fabricated titanium‐based nanocomposites

Shi

Ren

et al. 2023

Materials & Corrosion

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As a high‐efficiency laser additive manufacturing technology, laser powder bed fusion (LPBF) has unparalleled advantages in the manufacture of titanium matrix composites. In this work, the effect of laser energy density (LED) on the forming quality, microstructure evolution, and corrosion resistance of LPBF‐fabricated nanographene oxide reinforced titanium matrix nanocomposites (GO/TC4) was investigated. The results show that the optimal surface roughness and relative density of GO/TC4 nanocomposites fabricated by LPBF are 11.8 μm and 99.40%, respectively. The microstructure is mainly acicular α/α′‐Ti, accompanied by a small amount of β‐phase grain boundaries. When the LED is increased to 58.33 J/mm3, the self‐corrosion potential of GO/TC4 sample reaches 0.345 V in 3.5 wt% NaCl solution, and the GO/TC458.33 nanocomposite exhibits the highest corrosion resistance. The results revealed that the corrosion products on the surface of the samples were mainly composed of a passivation film of TiO2 and a small amount of Al2O3.

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“…Based on those particular studies, it would be worth considering that, before anything else, as-printed LPBF parts tend to already have a relatively high surface roughness (Yadollahi et al, 2017;Koutiri et al, 2018;Skalon et al, 2020;Lizzul et al, 2021;Pérez-Ruiz et al, 2022;Simson and Subbu, 2022), being this feature most likely a positive trait for the AddJoining approach. Studies in the past resorted to a number of different strategies to make metallic surfaces more susceptible to metal-polymer interlocking, such as sandblasting (Falck et al, 2019;Hertle et al, 2020;Belei et al, 2022a) and CNC machining (Alhmoudi et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing of metal-polymer hybrid parts: the influence of as-printed LPBF surface roughness on the joint strength

et al. 2023

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As-printed Laser-Powder Bed Fusion (LPBF) surfaces can provide anchoring spots for the infiltration of polymer printed by Fused Filament Fabrication (FFF), enhancing metal-polymer joint strength. This work evaluates the influence of the as-printed LPBF surface roughness and FFF parameters on the strength of Ti-6Al-4V/PA-CF joints produced by this process combination. A three-point bending testing method based on ISO 14679:1997 was deployed, whereby the energy dissipated by the joint interface was measured. Roughness was varied by 3D-printing the substrate with different inclination angles; Height and printing speed of the coating layer (the polymer layer in direct contact with the metal) were also varied. Data was interpreted using a combination between Decision Tree and Gradient Boosting Regression, ultimately suggesting that printing speed is the prominent parameter followed by inclination angle for joint strength. Additionally, the combined effect of low printing speed and inclination angle resulted in the highest energy absorption at the interface (>200 J).

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Effect of Process Parameters on Surface Integrity of LPBF Ti6Al4V

Cited by 16 publications

References 17 publications

Surface roughness of Ti6Al4V samples produced by laser powder bed fusion for bone implants

Surface roughness of Ti6Al4V samples produced by laser powder bed fusion for bone implants

Influence of laser energy density on the microstructure and corrosion resistance of LPBF‐fabricated titanium‐based nanocomposites

Additive manufacturing of metal-polymer hybrid parts: the influence of as-printed LPBF surface roughness on the joint strength

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