Abstract
Additive manufacturing (AM) technologies have a strong appeal to the industry targeting low-volume production for specific applications, as they currently provide mechanical properties under static loading comparable to those of conventionally fabricated parts. The current study presents results of fatigue crack propagation obtained using standard 6 mm thick Compact Tension specimens (CT) laser sintered and tested at R = 0. The main parameter studied was the effect of post-manufacturing heat treatment on the stable crack propagation and the transient behaviour after overloads. It was found that the thermal treatment caused important changes on both microstructure and crack path and promoted the increase of the fatigue crack propagation resistance. Both material microstructures exhibit significant transient crack propagation retardation after overloads probably by crack bifurcation effect, as the crack closure phenomena was not observed.
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