Post-processing of the Inconel 718 alloy parts fabricated by selective laser melting: Effects of mechanical surface treatments on surface topography, porosity, hardness and residual stress

Lesyk, Dmytro; Martı́nez, Silvia; Mordyuk, B.N.; Dzhemelinskyi, Vitaliy; Lamíkiz, Aitzol; Prokopenko, G.I.

doi:10.1016/j.surfcoat.2019.125136

Cited by 153 publications

(32 citation statements)

References 48 publications

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“…In another comparative study between EBM and SLM processes, it was observed that SLM manufactured commercially pure titanium (CP-Ti) scaffolds presented higher cell viability and cell adhesion than EBM manufactured Ti-6Al-4V (Ti64) scaffolds [185]. The surface finish of the printed parts is an important factor influencing biocompatibility, since it affects the cell attachment, proliferation and differentiation [38]. Low roughness values below 2.0 µm were reported to improve bone regeneration in titanium implants [186].…”

Section: Comparison Of the Am Techniques And Materials Used For Metalmentioning

confidence: 99%

Development of AM Technologies for Metals in the Sector of Medical Implants

Buj-Corral

Tejo-Otero

Fenollosa-Artés

2020

Metals

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Additive manufacturing (AM) processes have undergone significant progress in recent years, having been implemented in sectors as diverse as automotive, aerospace, electrical component manufacturing, etc. In the medical sector, different devices are printed, such as implants, surgical guides, scaffolds, tissue engineering, etc. Although nowadays some implants are made of plastics or ceramics, metals have been traditionally employed in their manufacture. However, metallic implants obtained by traditional methods such as machining have the drawbacks that they are manufactured in standard sizes, and that it is difficult to obtain porous structures that favor fixation of the prostheses by means of osseointegration. The present paper presents an overview of the use of AM technologies to manufacture metallic implants. First, the different technologies used for metals are presented, focusing on the main advantages and drawbacks of each one of them. Considered technologies are binder jetting (BJ), selective laser melting (SLM), electron beam melting (EBM), direct energy deposition (DED), and material extrusion by fused filament fabrication (FFF) with metal filled polymers. Then, different metals used in the medical sector are listed, and their properties are summarized, with the focus on Ti and CoCr alloys. They are divided into two groups, namely ferrous and non-ferrous alloys. Finally, the state-of-art about the manufacture of metallic implants with AM technologies is summarized. The present paper will help to explain the latest progress in the application of AM processes to the manufacture of implants.

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Section: Comparison Of the Am Techniques And Materials Used For Metalmentioning

confidence: 99%

Development of AM Technologies for Metals in the Sector of Medical Implants

Buj-Corral

Tejo-Otero

Fenollosa-Artés

2020

Metals

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“…In Reference [29], this process was successfully applied to SLM parts, reaching uniform surface morphologies on planar surfaces characterized by different build orientations; however, the case of functional parts characterized by complex shapes was not investigated. In Reference [30], a turbine blade manufactured in Inconel718 by SLM was processed by BF and other post-processing treatments. The results showed that the BF application permitted a slight improvement in the surface quality compared to the other studied processes.…”

Section: Of 19mentioning

confidence: 99%

Post-Processing of Complex SLM Parts by Barrel Finishing

et al. 2020

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Selective laser melting (SLM) enables the production of metal complex shapes that are difficult or impossible to obtain with conventional production processes. However, the attainable surface quality is insufficient for most applications; thus, a secondary finishing is frequently required. Barrel finishing is an interesting candidate but is often applied without consistent criteria aimed at finding processing parameters. This work presents a methodology based on Bagnold number evaluation and bed behavior diagram, developed on experimental apparatus with different charges and process parameters. The experimentation on an industrial machine and the profilometric analysis allowed the identification of appropriate process parameters and charge media for finishing the investigated materials (Ti6Al4V and Inconel718). Two case studies, characterized by complex shapes, were considered, and consistent surface measures allowed understanding the capability of the technology.

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“…The main features regarding fatigue of the work specimens made by this procedure are, as afore said, residual stresses, porosity, roughness, nonuniform microstructure and anisotropy [4][5][6][7], which reduce the fatigue strength and increase the scatter of the fatigue lives produced for the same cyclic load applied to different specimens taken from the same manufacturing batch. In addition to select the optimum manufacturing parameters to reduce defects, anisotropy, residual stresses, etc., several mechanical, thermo-mechanical and thermal treatments have been proposed to improve the strength and reduce the scatter [8][9][10][11][12][13][14][15][16][17][18][19][20]. These range from annealing or sand blasting to machining [9][10][11][12][13], Hot Isostatic Pressing (HIP) [13][14][15][16] or shot peening [17][18][19], or any combination of them [20].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to select the optimum manufacturing parameters to reduce defects, anisotropy, residual stresses, etc., several mechanical, thermo-mechanical and thermal treatments have been proposed to improve the strength and reduce the scatter [8][9][10][11][12][13][14][15][16][17][18][19][20]. These range from annealing or sand blasting to machining [9][10][11][12][13], Hot Isostatic Pressing (HIP) [13][14][15][16] or shot peening [17][18][19], or any combination of them [20]. Many experimental analysis have been published about the effect of these treatments on the fatigue strength, but mainly dedicated to the effect of thermal treatments, machining or HIP or combination of them [8][9][10][11][12][13][14][15][16]] and only a few about the effect of other surface treatment like shot or laser peening [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…These range from annealing or sand blasting to machining [9][10][11][12][13], Hot Isostatic Pressing (HIP) [13][14][15][16] or shot peening [17][18][19], or any combination of them [20]. Many experimental analysis have been published about the effect of these treatments on the fatigue strength, but mainly dedicated to the effect of thermal treatments, machining or HIP or combination of them [8][9][10][11][12][13][14][15][16]] and only a few about the effect of other surface treatment like shot or laser peening [17][18][19][20]. Actually, two of these works only consider the effect of shot peening on roughness, and on residual stresses and microhardness profiles close to the surface, but not directly on the fatigue strength, although they consider that the effect on those parameters will have also a beneficial effect on the fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

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Effect of surface treatment on the fatigue strength of additive manufactured Ti6Al4V alloy

Pintado

Vázquez

Domı́nguez

et al. 2020

Frattura Ed Integrità Strutturale

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Different alloys can be used for Additive Manufacturing (AM) with good structural strength. Among the titanium alloys, Ti6Al4V is the most used, especially for aerospace applications. There have been many analyses of the mechanical properties of additive manufactured Ti-6Al-4V with very good static strength results in general. However, there are still some difficulties to get fatigue properties close enough to the ones of specimens manufactured using traditional processes Considering the high effect of surface roughness on the fatigue strength of AM specimens, this work deals with the effect produced by some surface treatments on the fatigue properties. Five treatments have been used for comparison. All specimens were annealed previously to reduce residual stresses, as well as sand blasted to reduce the roughness. The treatments considered are: 1) no treatment after annealing and sand blasting; 2) shot peening; 3) shot peening plus Chemical Assisted Surface Enhancement (CASE); 4) laser shock peening, and 5) HIP. After fatigue testing, a comparison of the results has been carried out. It was found that laser peening produced the best results, followed by shot peening plus CASE and shot peening, with the lowest strength produced by HIP as well as just sand blasting after thermal treatment.

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Post-processing of the Inconel 718 alloy parts fabricated by selective laser melting: Effects of mechanical surface treatments on surface topography, porosity, hardness and residual stress

Cited by 153 publications

References 48 publications

Development of AM Technologies for Metals in the Sector of Medical Implants

Development of AM Technologies for Metals in the Sector of Medical Implants

Post-Processing of Complex SLM Parts by Barrel Finishing

Effect of surface treatment on the fatigue strength of additive manufactured Ti6Al4V alloy

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