Mechanism of surface morphology in electron beam melting of Ti6Al4V based on computational flow patterns

Ge, Wenjun; Han, Soonhung; Fang, Yuchao; Cheon, Jason; Na, Suck Joo

doi:10.1016/j.apsusc.2017.05.033

Cited by 28 publications

(7 citation statements)

References 22 publications

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“…The term 2 The radiation heat loss is given by [21] 44 1 The moving laser beam is described by a Gaussian distribution [32] (16) where I is the beam power density, P is the laser power,  is the absorption coefficient, r is the beam radius, ( 0x , 0 z ) describes the starting position of the laser beam, 0 v denotes the scanning velocity. Due to the concern of computational cost, our model ignores the Fresnel reflections of the laser beam [33,34].…”

Section: Cfd Simulation Of Heat Transfer and Melt Flow Dynamicsmentioning

confidence: 99%

“…With the complex physical phenomena at microsecond and micrometer scales, it is challenging to monitor the SLM process by experiments. An attractive alternative to reveal the physical mechanisms of SLM defects is through predictive numerical simulation [16]. Korner et al [17] employed lattice Boltzmann method (LBM) to simulate the electron beam melting (EBM) process in 2D, including single layer and layer upon layer consolidation.…”

Section: Introductionmentioning

confidence: 99%

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A numerical investigation on the physical mechanisms of single track defects in selective laser melting

Tang

Tan

Wong

2018

International Journal of Heat and Mass Transfer

224

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Section: Cfd Simulation Of Heat Transfer and Melt Flow Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A numerical investigation on the physical mechanisms of single track defects in selective laser melting

Tang

Tan

Wong

2018

International Journal of Heat and Mass Transfer

224

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“…Upon increase of energy density, either by a change in beam current or scan speed, the roughness of the surface was found to be higher. This correlation was found in several studies, not only for EBM [44], but also for SLM [45]. However, in some studies focusing on SLM built parts, the roughness was reduced by an increase in energy density due to an increase in laser power or a decrease in scan speed [46,47].…”

Section: Roughness Of Ti6al4vmentioning

confidence: 69%

Overmoulding of Additively Manufactured Titanium Inserts Using Polyoxymethylene (POM)—Evaluation of Bond Quality as a Function of Process Parameters

et al. 2021

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Due to their process-induced porous surfaces, additively manufactured structures are not optimized for applications in which friction is a key factor. To improve the frictional properties of additively manufactured titanium inserts of various thicknesses, two tribologically optimized POM materials, which differ in terms of filler composition and contents, were used to overmould the inserts. The titanium inserts were manufactured in two different building directions, resulting in a variation in surface roughness. The main challenge with respect to overmoulding is to maintain an even, thin plastic layer on the titanium insert. In order to evaluate the adhesion between plastic and metal, the interface is examined by optical microscopy and assessment of the peeling resistance. The peeling test shows that the overmoulded titanium inserts with a higher surface roughness are characterized by a higher peeling resistance. It is further revealed that the POM material with a special filler concept shows superior peeling resistance.

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“…Based on fast process observation and simulation results of the molten pool formation under different process parameters, , Ti64 particles were fully melted to liquid by an electron beam in milliseconds and formed a molten pool, while the particles located far from the center of the beam were partially melted without enough energy (Figure ). As the electron beam was moved away, the molten pool cooled down and solidified very fast; the topography of the porous samples is a typical shape caused by this process as shown in Figure B,C.…”

Section: Results and Discussionmentioning

confidence: 99%

Cell Behavior on 3D Ti-6Al-4 V Scaffolds with Different Porosities

Liu

Jin

Zheng

et al. 2019

ACS Appl. Bio Mater.

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Porous titanium (Ti) and its alloys fabricated by additive manufacturing (AM) techniques have attractive potential for dental and bone defect repair fields. Understanding the relationship between cells and the surface of the as-built three-dimensional (3D) scaffold interactions is not only necessary for tissue engineering but also promising for improving the fabrication process in the manufacture of artificial implants by AM technology. In this study, we have aimed to investigate the cell behavior including adhesion and proliferation of fibroblasts (L929) on Ti-6Al-4 V scaffolds fabricated by the electron beam melting method. The porosities of Ti-6Al-4 V scaffolds are 0% (compact), 60%, and 70%, respectively. Different cell behaviors have been observed from all of the specimens after 4 and 8 days of cell incubation. The present result indicates that, besides the surface roughness, the surface topography of specimens should also be taken into consideration to investigate the interaction between implants and cells. Therefore, this study would provide several possibilities for improving the osteointegration functions of the manufactured porous metallic implants in orthopedic and dental applications.

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Mechanism of surface morphology in electron beam melting of Ti6Al4V based on computational flow patterns

Cited by 28 publications

References 22 publications

A numerical investigation on the physical mechanisms of single track defects in selective laser melting

A numerical investigation on the physical mechanisms of single track defects in selective laser melting

Overmoulding of Additively Manufactured Titanium Inserts Using Polyoxymethylene (POM)—Evaluation of Bond Quality as a Function of Process Parameters

Cell Behavior on 3D Ti-6Al-4 V Scaffolds with Different Porosities

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