Effect of Initial Surface Features on Laser Polishing of Co-Cr-Mo Alloy Made by Powder-Bed Fusion

Richter, Brodan; Blanke, N.; Werner, Christian; Vollertsen, Frank; Pfefferkorn, Frank E.

doi:10.1007/s11837-018-3216-2

Cited by 36 publications

(22 citation statements)

References 33 publications

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“…The materials used are cobalt‐chromium alloys (CoCr), inconel 718, tool steel H13, titanium Ti6Al‐4 V, aluminium AlSi10Mg and corrosion resistant steel 316 L. Figure 2 gives an overview of the surface roughness before and after laser polishing. [5, 20–40]…”

Section: Introductionmentioning

confidence: 99%

Process parameter dependencies of continuous and pulsed laser modes on surface polishing of additive manufactured aluminium AlSi10Mg parts

Hofele

Schanz

Roth

et al. 2021

Materialwissenschaft Werkst

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Laser powder bed fusion is a well‐established 3D printing technique for metal alloys, but exhibits a poor surface quality. Laser polishing provides the possibility of a fast contact‐free and fully‐automatable surface treatment. This paper deals with the experimental investigation of laser polishing of laser powder bed fusion parts made of aluminium AlSi10Mg. Laser polishing is done with a 4 kW solid state disc laser in combination with a multi‐axis system and a one dimensional scanner optic. The laser is operated at continuous and pulsed operation mode. The parameter study reveals a high dependency of the achievable roughness on the laser beam intensity, the track and pulse overlap, the energy density and the number of polishing passes and polishing directions. Pulsed laser polishing mode with up to four passes from different directions revealed the lowest surface roughness of 0.14 μm Ra. With respect to the initial average surface roughness of Ra = 8.03 μm a reduction of the surface roughness of greater than 98 % could be achieved. Polishing with continuous laser radiation at one polishing pass resulted in Ra = 0.23 μm at an area rate of 20 cm2/min. Laser polishing using four passes achieved a further improvement up to Ra = 0.14 μm.

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Section: Introductionmentioning

confidence: 99%

Process parameter dependencies of continuous and pulsed laser modes on surface polishing of additive manufactured aluminium AlSi10Mg parts

Hofele

Schanz

Roth

et al. 2021

Materialwissenschaft Werkst

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“…This is presumably a consequence of the remelting process. Similar to laser polishing using continuous wave laser radiation [34][35][36], multiple processing steps lead to a reduction of the height of surface features due to material redistribution. This material redistribution primarily due to capillary forces-counteracts the surface structure formation in the WaveShape process.…”

Section: Number Of Repetitions and Process Timementioning

confidence: 99%

Surface Structuring by Laser Remelting (WaveShape): Microstructuring of Ti6Al4V for a Small Laser Beam Diameter and High Scan Speeds

Temmler

2021

Micromachines

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The appearance of a surface is a crucial characteristic of a part or component. Laser-based micromachining gets increasingly important in generating tailored surface topographies. A novel structuring technique for surface engineering is surface structuring by laser remelting (WaveShape), in which surface features are created without material loss. In this study, we investigated the evolution of surface topographies on Ti6Al4V for a laser beam diameter of 50 m and scan speeds larger than 100 mm/s. Surface features with aspect ratios (ratio of height to width) of almost 1:1 were achieved using the WaveShape process. Furthermore, wavelengths smaller than 500 m could be effectively structured using scan speeds of up to 500 mm/s. The experimental results showed further that the efficiency of the WaveShape process in terms of achieved structure height per unit time significantly increases for high scan speeds.

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“…The grinding was performed until the surface quality stopped improving for that grit size grinding paper, which took approximately two minutes.microThe laser polishing was performed on the sides of the 90 sample (surface orthogonal to the build layer) using a 200 W, 1070 nm fiber laser (SPI Lasers, SP-200C-W-S6-A-B) that was operated in continuous-wave mode. The laser polishing conditions were based on those used in previous studies [7], and a by 1 mm area was polished. The nominal laser processing parameters include a beam diameter of 100 m, a beam scanning velocity of 200 mm/s, a laser power of 80 W, and a spacing distance between subsequent laser lines of 60 m. The laser traveled in the same direction for every line and scan.…”

Section: Surface Post-processingmentioning

confidence: 99%

Roughness Parameters for Classification of As-Built AM Surfaces

Richter¹,

Blanke²,

Werner³

et al. 2021

Preprint

Self Cite

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One of the challenges facing the industrial adoption of additively manufactured parts is the surface roughness on the as-built part. The surface roughness of parts is frequently characterized by metrics specified by international standards organizations. However, these standards list many surface metrics that can make it unclear which to use to best describe the surface. In this work, the ability of the various surface metrics to successfully classify the as-built and post-processed surfaces is studied using linear classification models. Laser polishing via remelting and manual grinding are the post-processing techniques used to smooth the as-built surface. The ability of the linear classifier to successfully categorize the various surfaces is demonstrated, and the various surface metrics are ranked according to the strength of their individual ability to classify the surfaces. This work promotes the method as a potential way to autonomously classify as-built and laser polished surfaces.

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Effect of Initial Surface Features on Laser Polishing of Co-Cr-Mo Alloy Made by Powder-Bed Fusion

Cited by 36 publications

References 33 publications

Process parameter dependencies of continuous and pulsed laser modes on surface polishing of additive manufactured aluminium AlSi10Mg parts

Process parameter dependencies of continuous and pulsed laser modes on surface polishing of additive manufactured aluminium AlSi10Mg parts

Surface Structuring by Laser Remelting (WaveShape): Microstructuring of Ti6Al4V for a Small Laser Beam Diameter and High Scan Speeds

Roughness Parameters for Classification of As-Built AM Surfaces

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