Abstract
We investigate the effect of heat treatment on the microstructure and fatigue strength of CoCrMo alloys fabricated by selective laser melting. Specimens are prepared in vertical and horizontal orientations with respect to the build direction and are subjected to heat treatment at 1150 °C for 1 h. Evaluation of the microstructure and fatigue strength reveals that the heat-treated specimens have significantly higher fatigue strength than the as-built specimens, which is attributed to the occurrence of recrystallization and the disappearance of molten pool boundaries during heat treatment. However, despite microstructure homogenization in the heat-treated samples, they exhibit mechanical anisotropy (similar to the as-built samples), which is attributed to the influence of the sample orientation on the number of layers and the processing time.
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