Laser polishing of additive manufactured Ti alloys

P., C.; Guan, Yingchun; Zhou, Wei

doi:10.1016/j.optlaseng.2017.02.005

Cited by 247 publications

(112 citation statements)

References 34 publications

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“…The lower strength of unpolished Cu/PLA sample is primarily due to the gaps and the extensive porosities inside the sample because of the poor printing quality. After laser polishing, the porosity and bulk defects are reduced, and the interface bonding between the Cu fiber and the PLA matrix is improved, resulting in an increase in polymer chain anchoring on the fiber . From Table , it is observed that after laser polishing, the elongation‐at‐break decreases by 24.41%, 32.83%, 28.37%, and 37.84% for S1, S2, S3, and S4, respectively.…”

Section: Resultsmentioning

confidence: 99%

Laser polishing of Cu/PLA composite parts fabricated by fused deposition modeling: Analysis of surface finish and mechanical properties

et al. 2019

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Fused deposition modeling (FDM) technology decreases production time and cost in engineering industry, but with typical low surface quality. In this study, laser polishing was employed to improve surface quality of copper fiber/polylactide acid (Cu/PLA) composite parts fabricated by FDM. Surface roughness, surface morphology, dynamic mechanical analysis (DMA), and tensile properties were studied. The results showed that after laser polishing, the surface roughness was reduced by more than 91% (from 10.52 to 0.87 μm Sa) at the optimized parameters (the laser power of 5 W and the laser beam diameter of 200 μm). Laser polishing can effectively remove surface defects formed during FDM. DMA showed that the storage modulus, loss modulus, and glass transition temperature of Cu/PLA composites were significantly improved, because the Cu fibers and PLA matrix formed a strong interfacial adhesion after treatment. Moreover, the tensile strength and Young's modulus of the Cu/PLA composites sample also improved by laser polishing. The fracture morphologies were observed, and the possible strengthening mechanism was also discussed.

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Section: Resultsmentioning

confidence: 99%

Laser polishing of Cu/PLA composite parts fabricated by fused deposition modeling: Analysis of surface finish and mechanical properties

et al. 2019

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“…As is well known, laser polishing is a promising method to decrease the porosity and increase the density of AM parts to almost 100%. After laser polishing, the porosity and bulk defects of FDM‐printed PLA decrease . Laser‐polished specimen shows higher values of E’ due to the reduced molecular mobility of the denser structure.…”

Section: Resultsmentioning

confidence: 99%

“…In the past few decades, laser polishing has been successfully used to improve the surface quality of the parts fabricated by various materials, including metals and nonmetals . Recently, with the development of AM technology, researchers have begun to try laser polishing as a postprocessing method to improve the surface quality of the AM parts . Chai et al .…”

Section: Introductionmentioning

confidence: 99%

Effects of laser polishing on surface quality and mechanical properties of PLA parts built by fused deposition modeling

Chen

Zhang

Gan

2019

J of Applied Polymer Sci

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Fused deposition modeling (FDM) produces parts through layer by layer on the top of each other, making it almost impossible to obtain smooth printed parts. Hence, there is a huge demand for the postprocessing of the FDM-printed parts. Laser polishing is a novel technique that can be used to polish products to obtain a smoother surface. The aim of this work was to explore the feasibility of surface-finishing FDM-printed polylactic acid (PLA) parts by laser polishing. The surface roughness, surface morphology, dynamic mechanical analysis (DMA), and tensile properties were investigated. The results indicated that the lower laser power and the bigger laser beam diameter within a certain range could facilitate the formation of smoother surface. With optimized parameters, the surface roughness was reduced by 90.4%. DMA showed that the storage modulus (E') and glass transition temperature of PLA specimens were significantly improved due to the decrease of molecular mobility of denser structures. Moreover, the tensile strength and Young's modulus of the PLA specimen were also significantly increased after laser polishing. The fracture morphologies were observed, and the possible strengthening mechanism was also discussed. These results indicated that laser polishing could be an efficient method for surface polishing of FDM parts.

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“…Macrostructure smoothing can be achieved by applying continuous wave (cw) laser radiation, this process is known as laser polishing (LP) and it is mainly focused on improving the surface quality of AM components via demolishing surface asperities. Although several attempts have been made to examine the effects of laser polishing and the resulting surface roughness, there has been no detailed and thorough investigation of the effect of process parameters on the generated surface, to enable prediction and optimisation of the process responses [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of process parameters on surface texture generated by laser polishing of additively manufactured Ti-6Al-4V

Solheid¹,

Elkaseer

Wunsch

et al. 2020

Laser-Based Micro- And Nanoprocessing XIV

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Although there have been numerous attempts to define how different laser polishing parameters affect the generated surface roughness, there has been no detailed investigation of how their effects can be combined to optimize the process. This paper applies statistical analysis to model and predict the resulting surface roughness for laser post-processing of components made of Ti-6Al-4V and produced by laser powder bed fusion. This model is based on analysis of a wideranging experimental programme investigating how the interaction of the governing parameters, i.e., laser power, number of repetitions, axial feed rate, scanning speed, and focal position, affected surface roughness. The experimental programme was the result of a robust Design of Experiments analysis and experimental analysis using ANOVA. It is expected that the outcomes will contribute towards the understanding of how the governing parameters influence the laser polishing process and final surface roughness, and would be a tool for optimizing their selection. The results of the ANOVA (analysis of variance) revealed that the most significant parameters are scanning speed followed by laser power and then axial feed rate. In addition, a clear tendency for the estimated Ra to decrease with the increase in laser power at lower values of axial feed rate and of scanning speed, and a focal position in the region of 2 mm. It is noted that the process parameters were varied over wide ranges, including extreme values, which made it difficult to accurately model the dependent variable over the full range of experimental trials.

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Laser polishing of additive manufactured Ti alloys

Cited by 247 publications

References 34 publications

Laser polishing of Cu/PLA composite parts fabricated by fused deposition modeling: Analysis of surface finish and mechanical properties

Laser polishing of Cu/PLA composite parts fabricated by fused deposition modeling: Analysis of surface finish and mechanical properties

Effects of laser polishing on surface quality and mechanical properties of PLA parts built by fused deposition modeling

Effect of process parameters on surface texture generated by laser polishing of additively manufactured Ti-6Al-4V

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