Effect of Post-Process Machining on Surface Properties of Additively Manufactured H13 Tool Steel

Breidenstein, Bernd; Brenne, F.; Wu, Liang; Niendorf, Т.; Denkena, Berend

doi:10.3139/105.110359

Cited by 28 publications

(16 citation statements)

References 28 publications

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“…Simultaneously, more profound cavitation erosion topology that is more related to the classic mechanochemical reactions discussed below was obtained. Ultrasonic plastic deformation showed impressive results combined with mechanical machining [49] compared to the results obtained in the current work by applying ultrasonic plastic deformation (roughness arithmetic mean deviation R a of 5.02 µm), which exceed previously reported data for deformation rolling (R a of 7-14 µm) and allow reduction of roughness peaks when waviness of the parts' surfaces almost does not change. However, the application of only plastic deformation or rolling allows significant reduction of residual stresses and excludes the presence of any chips or abrasions [66].…”

Section: Discussionsupporting

confidence: 47%

“…The work of Breidenstein, B. [49] should be considered the most significant research on that topic; the authors researched the effect of face milling and/or deep rolling for surfaces produced by selective laser melting (laser powder bed fusion) from AISI H13 tool steel. The most significant effect was achieved for the samples with combined treatment-milling and subsequent rolling-by 24 times, from 28-37 µm down to 1.4 µm, when milling itself reduced the roughness by 3.2-6.3 µm and deep rolling only reduced it by 7-14 µm.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Postprocessing on Wear Resistance of Aerospace Steel Parts Produced by Laser Powder Bed Fusion

et al. 2020

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The paper is devoted to the research of the effect of ultrasonic postprocessing—specifically, the effects of ultrasonic cavitation-abrasive finishing, ultrasonic plastic deformation, and vibration tumbling on surface quality, wear resistance, and the ability of real aircraft parts with complex geometries and with sizes less than and more than 100 mm to work in exploitation conditions. The parts were produced by laser powder bed fusion from two types of anticorrosion steels of austenitic and martensitic grades—20Kh13 (DIN 1.4021, X20Cr13, AISI 420) and 12Kh18N9T (DIN 1.4541, X10CrNiTi18-10, AISI 321). The finishing technologies based on mechanical action—plastic deformation, abrasive wear, and complex mechanolysis showed an effect on reducing the submicron surface roughness, removing the trapped powder granules from the manufactured functional surfaces and their wear resistance. The tests were completed by proving resistance of the produced parts to exploitation conditions—vibration fatigue and corrosion in salt fog. The roughness arithmetic mean deviation Ra was improved by 50–52% after cavitation-abrasive finishing, by 28–30% after ultrasonic plastic deformation, and by 65–70% after vibratory tumbling. The effect on wear resistance is correlated with the improved roughness. The effect of used techniques on resistance to abrasive wear was explained and grounded.

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Section: Discussionsupporting

confidence: 47%

Section: Introductionmentioning

confidence: 99%

Influence of Postprocessing on Wear Resistance of Aerospace Steel Parts Produced by Laser Powder Bed Fusion

et al. 2020

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“…The additive manufactured metal parts have an initial and untreated surface roughness of approximately 8 μm to 22 μm, Figure 2. Depending on the material, laser parameters and process strategies, the achievable roughness reduction varies between 50 %–90 % [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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“…H13 steel was successfully processed by SLM, following process parameters already detailed in previous work [ 26 ]. The final density of the steel cuboids was above 99%.…”

Section: Resultsmentioning

confidence: 99%

Tribological Performance of Additively Manufactured AISI H13 Steel in Different Surface Conditions

et al. 2021

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Additive manufacturing of metallic tribological components offers unprecedented degrees of freedom, but the surface roughness of most as-printed surfaces impedes the direct applicability of such structures, and postprocessing is necessary. Here, the tribological performance of AISI H13 steel samples was studied. These were additively manufactured through laser powder bed fusion (L-PBF), also referred to as selective laser melting (SLM). Samples were tested in four different surface conditions: as-printed, polished, ground and polished, and laser-surface-textured (LST) with round dimples. Friction experiments were conducted in a pin-on-disk fashion against bearing steel disks under lubrication with an additive-free mineral base oil for sliding speeds between 20 and 170 mm/s. Results demonstrated that, among the four surface treatments, grinding and polishing resulted in the lowest friction coefficient, followed by the as-printed state, while both polishing alone and laser-surface texturing increased the friction coefficient. Surprisingly, direct correlation between surface roughness and friction coefficient, i.e., the rougher the surface was, the higher the friction force, was not observed. Wear was minimal in all cases and below what could be detected by gravimetrical means. These results highlight the need for an adequate post-processing treatment of additively manufactured parts that are to be employed in tribological systems.

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Effect of Post-Process Machining on Surface Properties of Additively Manufactured H13 Tool Steel

Cited by 28 publications

References 28 publications

Influence of Postprocessing on Wear Resistance of Aerospace Steel Parts Produced by Laser Powder Bed Fusion

Influence of Postprocessing on Wear Resistance of Aerospace Steel Parts Produced by Laser Powder Bed Fusion

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

Tribological Performance of Additively Manufactured AISI H13 Steel in Different Surface Conditions

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