Abstract
Laser powder bed fusion produced Scalmalloy® is a high potential candidate in aerospace industry. However, fatigue properties are the Achilles heel of additive manufacturing process, impeding high-performance fatigue loaded applications. This paper aims to unveil the impact of unique bimodal microstructure on the quasi-static tensile and the fatigue properties. It is shown that the material intrinsic fatigue strength of Scalmalloy® outperforms its additively manufactured aluminium counterparts significantly, already reaching values of additively manufactured Ti-6Al-4V. Moreover, by evaluating the R-curve for Scalmalloy®, short crack growth was also taken into consideration for the analysis of the fatigue behaviour, elaborating an advanced Kitagawa-Takahashi diagram.
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