Abstract
The residual porosity and surface roughness of metal materials generated via additive manufacturing are generally regarded as the major influence factors on the fatigue strength. The mechanical properties of specimens out of tool steel 1.2344 were investigated. Tensile strength and hardness achieved results in the range of conventionally fabricated parts, whereas a significantly lower fatigue strength was observed. Cracks were induced by the present cavities as well as in the steel matrix. Further investigations of the oxygen content showed a high oxygen content of 570 ppm homogeneously distributed inside the specimens potentially limiting the strength of the matrix itself.
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