Tribological investigations on additively manufactured surfaces using extreme high-speed laser material deposition (ehla) and laser powder bed fusion (LPBF)

Today's economic and ecological directives demand for highly sustainable machine parts by lowproduction cost and energy consumption. Consequently, it is crucial to guarantee a long service life byprotecting all components against wear and corrosion. However, hydraulic components always includestressed surfaces, which suffer from heavy loads at high relative speeds. To prevent fretting, coatingprocesses like thermal spraying or hard chrome have a long history in the field of hydraulics. Newadditive laser-based processes like EHLA and LPBF offer the potential to apply new coatings withoutenvironmentally hazardous substances such as chromium or to manufacture complex parts with newfunctionalities. So far, additively manufactured surfaces with relative movements are post-processedto obtain surface qualities similar to subtractive methods, as the tribological properties of additivesurfaces have not been investigated to date. Therefore, this paper investigates the frictional behavior of316L surfaces produced by laser-based EHLA and LPBF processes using a disc-disc tribometer.