The Results and Discussion chapter focuses on the high-temperature damage tolerance of Laser Powder Bed Fusion (LPBF) processed STAL-15 as a function of build orientation, testing temperature, and post-processing heat treatment route. From a metallurgical point of view, the superior response of vertically printed specimens compared with horizontally printed ones is expected, because the columnar grain structure produced during LPBF is more favorably aligned with the tensile loading direction in the 90° condition. Similarly, the weak response of horizontally printed specimens tested at 850 °C is not unexpected, since this condition combines an unfavorable loading direction with enhanced oxidation, grain-boundary damage, and thermally activated void formation.