Abstract
The effects of scanning speeds (600–800 mm/s) on the microstructure, microhardness and tribocorrosion behavior of temporary bone-substitution alloys produced from Fe-20 wt% Mn pre-alloyed powders using selective laser melting (SLM) were investigated. SLM-fabricated alloys were mainly composed of cellular, columnar subgrains and lath martensite that were mainly composed of BCC α′-martensite and HCP ε-martensite. The alloys exhibited both higher hardnesses and lower friction coefficients than pure Fe. The sample processed at scanning speed of 700 mm/s showing the lowest corrosion-wear rate. Wear mechanisms of SLMed Fe-Mn alloys were mainly abrasive and oxidative wear, while pure Fe showed mainly adhesive wear. This research demonstrates exceptional tribocorrosion resistance of SLMed Fe-Mn alloys, and their potential as Fe-based biodegradable metals for orthopedic applications.
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