Post-Processing Effects on Surface Properties of Direct Metal Laser Sintered AlSi10Mg Parts

다국어 초록 (Multilingual Abstract)

Direct metal laser sintering is a powder bed fusion type additive manufacturing (AM) method. It provides opportunity tocreate near net shape parts layer-by-layer. Because of poor surface quality post processing operations are required. Thispaper investigates the effect of surface finishing operations such as abrasive blasting, shot peening and polishing on surfacetexture properties and green tribological behavior of direct metal laser sintered AlSi10Mg parts. 2D and 3D surface roughnesscharacterization, density and hardness measurements were implemented. Ball-on-disc wear tests were applied under10 N load with palm oil and soybean oil as green lubricants. Petrol based, commercial machine oil was used for control. Theresults revealed that post processing operations affected surface texture and tribological properties of the samples. Abrasiveblasting increased surface hardness to the 187 HV, while it was measured as 178 HV and 124 HV for shot peening and polishingprocesses respectively. Average surface roughness Ra, was measured as 18.71 μm for shot blasted surface. This valuerecorded as 5.39 μm for shot peened and 1.39 μm for polished surfaces. Minimum wear rate was calculated as 3.88 × 10−4mm3/Nm for shot peened surface with palm oil while maximum was calculated as 7.92 × 10−4 mm3/Nm for polished surfacewith MO lubrication. Palm oil and soybean oil represented superior lubricating properties than petrol based commercialmachine oil for all surfaces. It can be concluded that surface post processing has important effect on texture properties ofmetal AM parts. Moreover, vegetable oils are promising lubricants for increasing tribological properties of AM surfaces.

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