Polishing Titanium- and Nickel-based Alloys using Cw-Laser Radiation

Kumstel, Judith; Kirsch, Benjamin

doi:10.1016/j.phpro.2013.03.089

Cited by 61 publications

(31 citation statements)

References 3 publications

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“…Several investigations have shown the possibilities of laser polishing with various materials, such as aluminum, steel and titanium [22][23][24]. The initial rough surface conditions of selective laser melted parts are ideal for utilizing laser polishing.…”

Section: Introductionmentioning

confidence: 99%

Metallurgical investigations of laser remelted additively manufactured AlSi10Mg parts

Schanz

Hofele

Ruck

et al. 2017

Materialwissenschaft Werkst

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Selective laser melting is gaining importance to manufacture reliable and highly complex parts. However, the surfaces of the selective laser melted parts exhibit for many applications an insufficient high roughness, thus require subsequent post processing steps. A relatively new way to reduce the surface roughness is the laser polishing technique. In the present paper, additively manufactured AlSi10Mg samples were polished with different laser intensities and laser modes. The investigations contain the potential of roughness reduction and enhancement of the surface appearances, which can be achieved by laser polishing of the as‐built surfaces. An initial arithmetic mean roughness of 8.43 μm was remarkably reduced up to 98 %. The compositions of the polished surfaces were detected and the surface appearances were examined. Reasons and mechanisms were explained and depicted for the occurred shade formations on the polished surfaces. High laser intensity led to segregation of silicon and magnesium on the surface. A higher laser intensity enabled an increased melt depth within the conture layer of the selective laser melting structure. Through increasing melt depth, a porosity of max. 1.7 % was detected in the remolten area. Hardness investigations of the initial and laser remolten cross section revealed no significant reduction in hardness.

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Section: Introductionmentioning

confidence: 99%

Metallurgical investigations of laser remelted additively manufactured AlSi10Mg parts

Schanz

Hofele

Ruck

et al. 2017

Materialwissenschaft Werkst

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show abstract

“…Laser polishing as a technique to reduce surface roughness has been investigated by various researches [11,12] who have shown promising results. Laser polishing of SLM sintered titanium and nickel-based alloys were studied by Kumstel [11], who concluded that the polished surface mainly depended on the surface material, initial topography and laser beam density.…”

Section: Introductionmentioning

confidence: 99%

“…Laser polishing of SLM sintered titanium and nickel-based alloys were studied by Kumstel [11], who concluded that the polished surface mainly depended on the surface material, initial topography and laser beam density. Laser polishing of Inconel-718 parts built by laser metal deposition (LMD) has been investigated by Dadbakhsh [13], who focused on identifying the optimum process parameters to achieve an 80% reduction in surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Laser polishing of selective laser melted components

Marimuthu

Triantaphyllou

Antar

et al. 2015

International Journal of Machine Tools and Manufacture

230

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Citation: MARIMUTHU, S. et al., 2015 AbstractThe shape complexities of aerospace components are continuously increasing, which encourages industries to refine their manufacturing processes. Among such processes, the selective laser melting (SLM) process is becoming an economical and energy efficient alternative to conventional manufacturing processes. However, dependent on the component shape, the high surface roughness observed with SLM parts can affect the surface integrity and geometric tolerances of the manufactured components. To account for this, laser polishing of SLM components is emerging as a viable process to achieve high-quality surfaces. This report details an investigation carried out to understand the basic fundamentals of continuous wave laser polishing of SLM samples. A numerical model, based on a computational fluid dynamic formulation, was used to assist the understanding of melt pool dynamics, which significantly controls the final surface roughness. The investigation identified the input thermal energy as the key parameter that significantly affect the melt pool convection, and essentially controls the surface quality. Minimum meltpool velocity is essential to achieve wider laser polished track width with good surface finish. Experimental results showed a reduction of surface roughness from 10.2μm to 2.4μm after laser polishing with optimised parameters. Strategies to control the surface topology during laser polishing of SLM components are discussed.

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“…Fibre and solid-state lasers are commonly used for re-melting, polishing and texturing the surface of metals, such as steel , titanium (Nusser et al, 2013), GGG70L cast iron (Ukar et al, 2013) and nickel-based Inconel ® 718 alloy (Kumstel and Kirsch, 2013). Khoong et al (2010) demonstrated that a 355 nm solid-state YAG laser can also be used for so called "soft marking" of silicon wafers.…”

Section: Introductionmentioning

confidence: 99%

Laser microsculpting for the generation of robust diffractive security markings on the surface of metals

Wlodarczyk

Ardron

Waddie

et al. 2015

Journal of Materials Processing Technology

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a b s t r a c tWe report the development of a laser-based process for the direct writing ('microsculpting') of unique security markings (reflective phase holograms) on the surface of metals. In contrast to the common approaches used for unique marking of the metal products and components, e.g., polymer holographic stickers which are attached to metals as an adhesive tape, our process enables the generation of the security markings directly onto the metal surface and thus overcomes the problems with tampering and biocompatibility which are typical drawbacks of holographic stickers. The process uses 35 ns laser pulses of wavelength 355 nm to generate optically-smooth deformations on the metal surface using a localised laser melting process. Security markings (holographic structures) on 304-grade stainless steel surface are fabricated, and their resulted optical performance is tested using a He-Ne laser beam of 632.8 nm wavelength.

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Polishing Titanium- and Nickel-based Alloys using Cw-Laser Radiation

Cited by 61 publications

References 3 publications

Metallurgical investigations of laser remelted additively manufactured AlSi10Mg parts

Metallurgical investigations of laser remelted additively manufactured AlSi10Mg parts

Laser polishing of selective laser melted components

Laser microsculpting for the generation of robust diffractive security markings on the surface of metals

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