The effect of preprocessing on surface quality in the chemical polishing of parts from titanium alloy produced by SLM

Balyakin, Andrey; Goncharov, Evgeny; Zhuchenko, Evgeny

doi:10.1016/j.matpr.2019.07.671

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…The chemical medium used for the chemical polishing of titanium alloys is usually a mixture of hydrofluoric acid and nitric acid (HF-HNO3) or an acidic solution containing fluoride ions 17 , 23 . However, hydrofluoric acid is a highly toxic substance that easily volatilizes into the air, causing great harm to the environment and the human body.…”

Section: Methodsmentioning

confidence: 99%

Selective and noncontaminated surface polishing of medical Ti-6Al-4V titanium alloy by laser chemical processing

Shao

Sun

Wang³

et al. 2022

Opt. Eng.

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Selective and noncontaminated surface polishing of titanium alloy implants is crucial in the biomedical field. We employed a pulsed laser as a localized and selective heat source and dilute phosphoric acid as a corrosion solution for laser chemical polishing (LCP) of medical Ti-6Al-4V titanium alloy surface. The effect of laser fluence on the removal groove morphology of titanium alloy surfaces was systematically studied, and the characteristics and mechanisms of material removal were further discussed. The results show that the groove morphology of the workpiece surface at different laser fluences can be classified into three categories, depending on the two-dimensional removal profile. The removal mechanism of LCP is a combination of laser etching and chemical corrosion, and chemical etching can completely remove the residues and melts produced by laser ablation. Finally, selective polishing of medical Ti-6Al-4V titanium alloy was achieved by setting appropriate process parameters. Moreover, the energy-dispersive x-ray spectroscopy analysis showed that there was no detectable chemical impurity contamination on the polished surface.

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Section: Methodsmentioning

confidence: 99%

Selective and noncontaminated surface polishing of medical Ti-6Al-4V titanium alloy by laser chemical processing

Shao

Sun

Wang³

et al. 2022

Opt. Eng.

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“…The concentration and composition of the solution also play significant role in the polishing performance. For example, according to Balyakin et al [81], hydrofluoric acid, when in reaction with the titanium surface, releases hydrogen gas which is highly explosive and can cause hydrogen embrittlement. Hence, the addition of HNO 3 can eliminate the production of hydrogen by changing the chemical reaction.…”

Section: Electrochemical and Chemical Machiningmentioning

confidence: 99%

“…Moreover, according to Basha et al [71] and Crane et al [93], complex geometries such as cellular structures can be post-processed using chemical and electrochemical finishing with predictable and reproducible results. However, chemical finishing is associated with a slow removal rate and high toxicity of the etching reagents [81].…”

Section: Electrochemical and Chemical Machiningmentioning

confidence: 99%

“…The post-processing of complex and intricate parts is possible The material removal rate might be slow No impact on residual stress Dangerous chemicals Less expensive Repeatable, reproducible results, homogeneous dissolution Can alter mechanical properties due to the change in surface morphology Internal features can be accessed [76][77][78][79][80][81][82][83][84][85][86][87][88]93] Laser polishing Laser polishing Heat from the laser can cause undesirable tensile residual stresses to appear Does not waste material because it remelts it Similar to laser-based AM technologies, and thus can be integrated with them The initial surface roughness may influence the final surface roughness Can alter the surface microstructure May increase the hardness of the surface material…”

Section: Electrochemical Finishingmentioning

confidence: 99%

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The Post-Processing of Additive Manufactured Polymeric and Metallic Parts

Syrlybayev

Seisekulova

Talamona

et al. 2022

JMMP

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The traditional manufacturing industry has been revolutionized with the introduction of additive manufacturing which is based on layer-by-layer manufacturing. Due to these tool-free techniques, complex shape manufacturing becomes much more convenient in comparison to traditional machining. However, additive manufacturing comes with its inherent process characteristics of high surface roughness, which in turn effect fatigue strength as well as residual stresses. Therefore, in this paper, common post-processing techniques for additive manufactured (AM) parts were examined. The main objective was to analyze the finishing processes in terms of their ability to finish complicated surfaces and their performance were expressed as average surface roughness (Sa and Ra). The techniques were divided according to the materials they applied to and the material removal mechanism. It was found that chemical finishing significantly reduces surface roughness and can be used to finish parts with complicated geometry. Laser finishing, on the other hand, cannot be used to finish intricate internal surfaces. Among the mechanical abrasion methods, abrasive flow finishing shows optimum results in terms of its ability to finish complicated freeform cavities with improved accuracy for both polymer and metal parts. However, it was found that, in general, most mechanical abrasion processes lack the ability to finish complex parts. Moreover, although most of post-processing methods are conducted using single finishing processes, AM parts can be finished with hybrid successive processes to reap the benefits of different post-processing techniques and overcome the limitation of individual process.

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“…The surface quality depends on the following factors: 1) impurities on the surface (oxide scale, foreign particle/contaminant); 2) presence of voids or pits; 3) surface roughness; 4) surface morphology [20,21]. Generally, the as-built surfaces of L-PBF manufactured alloys have high surface roughness and present some irregular geometrical features on it in comparison with conventionally machined parts [7,15,[22][23][24][25]. The as-fabricated surface quality of a L-PBF manufactured alloy is influenced by the manufacturing parameters, e.g.…”

Section: Introductionmentioning

confidence: 99%

A protective SiAlN coating on topographic surface of laser powder bed fusion manufactured Ti alloy

et al. 2023

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The effect of preprocessing on surface quality in the chemical polishing of parts from titanium alloy produced by SLM

Cited by 13 publications

References 11 publications

Selective and noncontaminated surface polishing of medical Ti-6Al-4V titanium alloy by laser chemical processing

Selective and noncontaminated surface polishing of medical Ti-6Al-4V titanium alloy by laser chemical processing

The Post-Processing of Additive Manufactured Polymeric and Metallic Parts

A protective SiAlN coating on topographic surface of laser powder bed fusion manufactured Ti alloy

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