Surface roughness and directional fatigue behavior of as-built EBM and DMLS Ti6Al4V

Nicoletto, Gianni; Konečná, Radomila; Frkáň, M.; Riva, Enrica

doi:10.1016/j.ijfatigue.2018.06.011

Cited by 81 publications

(35 citation statements)

References 17 publications

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“…The resulting roughness of parts produced in an additive way is always the result of a combination of input parameters-in particular, the particle size of the powder used, melting conditions (laser power and speed, laser scanning strategy, layer height), or orientation of the produced part relative to the building platform [6,32,33]. The roughness affects implant-bone interaction, the friction coefficient, osseointegration process [3,34] (especially in porous structures [4][5][6][7]), and the fatigue life of the product [11]. Liu [1] notes that the roughness is affected by several factors: (1) the staircase effect related to the subsequently deposited layers; (2) the attachment of the partly melted particles to the surface, and (3) the presence of pores and other imperfections close to surface.…”

Section: Roughness Of Materialsmentioning

confidence: 99%

“…We also observed this in the preparation of metallographic sections (Figure 17). Reference [11] also notes the lower surface roughness produced by DMLS compared to EBM (electron beam melting). given in [1].…”

Section: Roughness Of Materialsmentioning

confidence: 99%

“…In addition, it is possible to design the appropriate shape of the individual scaffold cells as well as their orientation with respect to the stresses of the product [7]. In examining the impact of the orientation of the porous structures against the stress direction, the scope of interest has also been extended to the impact of the orientation of compact products on the building platform, in particular on mechanical properties and fatigue resistance [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Guzanová

Draganovská

Ižaríková

et al. 2019

Metals

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This article is focused on the effect of position on a build platform on the hardness, roughness and corrosion rate of parts (Ti6Al4V) produced by direct metal laser sintering (DMLS) technology. During the sintering process, the test samples were located at key positions—at the corners and in the middle of the build platform. An experimental program started with a microstructure investigation in two perpendicular directions in individual positions. The selected mechanical property—hardness—was investigated on metallographic cuts in both directions and all positions, and data sets underwent a statistical analysis (analysis of variance (ANOVA), t-test, F-test). The same procedure was repeated for an assessment of position effect to surface roughness (Kruskal–Wallis test) and material corrosion resistance. On the build platform, the course of hardness, roughness, and corrosion rate values that can be expected in individual positions was mapped in detail.

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Section: Roughness Of Materialsmentioning

confidence: 99%

Section: Roughness Of Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Guzanová

Draganovská

Ižaríková

et al. 2019

Metals

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“…It is renowned that fatigue properties are strictly related to surface morphology; an increase in roughness leads to a reduction of fatigue life [10,11]. Nicoletto et al [12] studied the influence of roughness and morphology on the fatigue life of Ti alloy components produced with different orientations, using either a laser or an EBM system. Thus, the finishing of the AM parts is an important issue; different techniques can be adopted, such as abrasive fluidized bed [2], laser treatment [13][14][15][16], and chemical polishing [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Laser Finishing of Ti6Al4V Additive Manufactured Parts by Electron Beam Melting

Genna

Rubino

2019

Applied Sciences

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In this work, the feasibility of laser surface finishing of parts obtained by additive manufacturing (AM) was investigated. To this end, a 450 W fiber laser (operating in continuous wave, CW) was adopted to treat the surface of Ti-6Al-4V samples obtained via electron beam melting (EBM). During the tests, different laser energy densities and scanning speeds were used. In order to assess the quality of the treatment, either the as-built or the treated samples were analyzed by means of a three-dimensional (3D) profilometer, digital microscopy, and scanning electron microscopy. Analysis of variance (ANOVA) was performed to check which and how process parameters affected the finishing. The results show that, in the best conditions, the laser treatment reduced surface roughness by about 80%.

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“…Fousova et al discussed the influence of the surface roughness and internal defects on the fatigue properties of Ti6Al4V manufactured by EBPB and selective laser melting (SLM), and concluded that the surface roughness is the most critical property. 8 Thus, investigations into the effect of surface roughness on the fatigue performance of AM Ti6Al4V have been investigated by many research groups, [9][10][11][12][13][14] and several processes to be performed during and after AM have been proposed. 15 Edwards and Ramulu, et al showed that the fatigue strength of Ti6Al4V manufactured by EBPB and SLM in various stacking directions could be improved by machining and shot peening.…”

Section: Introductionmentioning

confidence: 99%

Use of an Abrasive Water Cavitating Jet and Peening Process to Improve the Fatigue Strength of Titanium Alloy 6Al-4V Manufactured by the Electron Beam Powder Bed Melting (EBPB) Additive Manufacturing Method

Soyama

Sanders

2019

JOM

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Metal components made by additive manufacturing have large inherent surface roughness, and, as such, their strength and fatigue life can be reduced significantly versus wrought products. In order to improve these properties, a novel mechanical surface treatment that introduces compressive residual stress while simultaneously reducing the surface roughness is proposed. The proposed treatment uses cavitation peening combined with an abrasive slurry. The impact of the kinetic energy-charged abrasive particles, induced by collapsing water cavitation vapor bubbles, produces compressive residual stress, while the abrasive reduces the surface roughness. Plane-bending fatigue tests were carried out to determine the effectiveness of this treatment on the fatigue life and strength of titanium alloy Ti6Al4V manufactured by electron beam melting. It was demonstrated that the fatigue strength of an as-built specimen was improved from 169 MPa to 280 MPa by the proposed treatment.

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Surface roughness and directional fatigue behavior of as-built EBM and DMLS Ti6Al4V

Cited by 81 publications

References 17 publications

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Laser Finishing of Ti6Al4V Additive Manufactured Parts by Electron Beam Melting

Use of an Abrasive Water Cavitating Jet and Peening Process to Improve the Fatigue Strength of Titanium Alloy 6Al-4V Manufactured by the Electron Beam Powder Bed Melting (EBPB) Additive Manufacturing Method

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