Polieren von SLM-Bauteilen mit kontinuierlicher Laserstrahlung

Kumstel, Judith

doi:10.1007/978-3-662-48473-9_10

Cited by 4 publications

(2 citation statements)

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“…Laser polishing of additively manufactured flat parts is investigated on stainless steel 316L [4] [26], Cobalt-Chromium alloys (CoCr) [27] [28] [29], ASTM F75 [30], Inconel IN 718 [30] [31] [32], ST-100 [33] [34], AlSi tool steel H13 [35], Titanium Ti6Al-4V [36] [37], Aluminium AlSi10Mg [38] [39], AlSi420 stainless steel [33], Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) [36] and SLM Fe-Ni steel [40]. For AlSi10Mg flat test specimens a roughness of Ra = 0.66 µm was achieved in [39].…”

Section: Introductionmentioning

confidence: 99%

Laser Polishing of Laser Powder Bed Fusion AlSi10Mg Parts—Influence of Initial Surface Roughness on Achievable Surface Quality

Hofele¹,

Roth²,

Schanz³

et al. 2021

MSA

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Laser Powder Bed Fusion (LPBF) is an Additive Manufacturing technique, which allows production of highly complex solid metal parts with good mechanical properties, compared to conventionally manufactured parts. Nevertheless, the layer-by-layer fabrication process also offers several disadvantages, including a relatively high surface roughness depending on the shape of the component, its position and orientation during the fabrication process. This paper deals with investigations on the surface roughness reduction capability, and residual surface structures by laser polishing of LPBF AlSi10Mg parts under varying initial surface roughness in order to investigate the influence of the surface behavior and initial surface roughness to the achievable surface quality by laser polishing. Hereto test specimens with varying fabrication orientations regarding to the built platform are printed and further polished. Thereby the initial arithmetic roughness varies between 19.2 µm and 8.0 µm. It could be shown that the achievable surface roughness by laser polishing with continuous and pulsed laser radiation is increasing with rising initial roughness, but the relative roughness reduction is almost constant in the range of 95% -97.5%. The analyzation of the residual roughness structures shows, that the main roughness differences is found in the middle and long structure wavelength regime, which are directly depending on the initial surface structures of 3D printing.

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Section: Introductionmentioning

confidence: 99%

Laser Polishing of Laser Powder Bed Fusion AlSi10Mg Parts—Influence of Initial Surface Roughness on Achievable Surface Quality

Hofele¹,

Roth²,

Schanz³

et al. 2021

MSA

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show abstract

“…Laser polishing of additive manufactured metal parts is commonly done with pulsed or continuous laser radiation. Investigations on cobalt-chromium alloys (CoCr) [15][16][17][18][19][20], Inconel 718 [21][22][23][24], Inconel 625 [25], tool steel [26], tool steel H13 [27], tool steel S136H [28], maraging steel 1.2709 [29], Titanium Ti6Al-4V [18,[30][31][32][33][34][35] and corrosion resistant steel 316L [36][37][38], 1.4542 [39] and LaserForm ST-100 [40,41] reveal roughness reduction rates between 50 and 90%.…”

Section: Introductionmentioning

confidence: 99%

Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power

et al. 2021

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In this study a new approach to laser polishing with periodic modulated laser power in the kilohertz regime is introduced. By varying the modulation frequency and modulation time, different periodic laser power curves with varying minimum, peak and average laser power can be created. The feasibility of the method is shown by polishing of vertical built AlSi10Mg L-PBF parts with an initial roughness of Ra = 12.22 µm. One polishing pass revealed a decreasing surface roughness with increasing energy density on the surface up to Ra = 0.145 µm. An increasing energy density results in a rising remelting depth between 50 and 255 µm and a rising relative porosity of 0.3% to 4.6%. Furthermore, the thermal process stability, analysed by the melt pool length in scanning direction, reveals a steadily increasing melt pool dimension due to component heating. Multiple laser polishing passes offers a further reduced surface roughness, especially at higher modulation frequencies and provides an improved orientation independent roughness homogeneity. The process stability regarding varying initial surface roughness revealed an almost constant relative roughness reduction rate with an achievable roughness variation after two polishing passes between Ra = 0.13–0.26 µm from an initial state of Ra = 8.0–19.2 µm.

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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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Polieren von SLM-Bauteilen mit kontinuierlicher Laserstrahlung

Cited by 4 publications

References 0 publications

Laser Polishing of Laser Powder Bed Fusion AlSi10Mg Parts—Influence of Initial Surface Roughness on Achievable Surface Quality

Laser Polishing of Laser Powder Bed Fusion AlSi10Mg Parts—Influence of Initial Surface Roughness on Achievable Surface Quality

Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power

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

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