The use of selective laser melting (SLM) as a method of additive manufacturing (AM) of valuable
objects has a promising future. Maraging steel is a widely used material due to its excellent qualities in
AM, so it is essential to know the fatigue mechanisms existing in this material manufactured at different
angles. The current state of research in fracture mechanics applied to additive manufacturing has been
analyzed to determine the importance of mechanical properties in this process. The CT samples were
laser fabricated in three orientations with respect to the intended crack plane; the angles used are 0-, 45-
and 90-degrees respect from the displacement. Fatigue tests show a longer service life with the 90-degree
specimens than with the 0-degree specimens, with a reduction up to 20% for the 0-degree tests. On the
45-degree specimens, a 40% reduction is observed compared to the 90-degree specimens, and there is no
apparent reason. A fracture surface analysis has shown different textures on the 45-degree specimens,
with rougher surfaces in certain tests due to a rougher application of load. This also results in sharper
ridges signifying rapid cracking due to shorter periods of higher forces. In addition, it is necessary to
continue the study to obtain the da/dN curves, as well, the reasons for these difference in surface areas.
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