Microstructure and tribological property of selective laser melted Fe-Mn-Al-C alloy

To investigate the microstructure and tribological property, Fe-16Mn-10Al-1.5C alloy was fabricated via selective laser melting technology at different laser scanning speeds for the first time in this study. The results show that the microstructure of Fe-Mn-Al-C alloy is composed equiaxed grains and columnar dendrites. And this alloy is mainly composed of gamma-Fe. This alloy has high microhardness and low coefficient of friction (COF). The microhardness of the SLM part increases with the decrease of the laser scanning speeds. The sample prepared at the highest speed not only has the lowest COF, but also the lowest wear rate amongst these SLM parts and its wear mechanism is mainly abrasive wear and adhesive wear. The wear mechanism of the samples V0.4 and V0.28 is not only abrasive wear but also adhesive wear that produces grooves, which generates a large number of grooves during the wear test. (C) 2020 Elsevier B.V. All rights reserved.