University of Ljubljana
Laser powder bed fusion has become one of the most desirable additive manufacturing (AM) techniques for producing metal complex shaped engineering parts. However, to truly take advantage of its capabilities and increase product value, control and understanding of part properties is required. In this work is presented connection between part properties under different processing parameters of printing and end result on the tribological performance. Three different laser powers and scanning speeds are used to produce specimens, of 18Ni300 material, that are printed in vertical and horizontal direction to test anisotropic properties. Microstructure, porosity and hardness were evaluated prior to the tribological testing. Tribological tests were done at three different pressures and sliding speeds in reciprocating ball on plate configuration against 100Cr6 ball. Microstructure shows typical melt pool geometry with fine inner microstructure of tube dendrites. The size and orientation of the dendrites depends on the input energy density. Tribological results show a wide spread in tribological performance in regard to siding direction, pressure and printing surface orientation.
Abstract
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