Effects of Powder Atomization Route and Post‐Processing Thermal Treatments on the Mechanical Properties and Fatigue Resistance of Additively Manufactured 18Ni300 Maraging Steel

In this work the effect of microstructural homogenization and solution annealing prior to ageing on mechanical properties fatigue resistance 18Ni300 maraging steel parts processed by laser powder bed fusion (L-PBF), using two different feedstock powders with N O contents is investigated. The static are not significantly affected selection powders. This ascribed extremely fine size nonmetallic inclusions, characteristic L-PBF process, even containing higher contents. tensile in both “directly aged,” “homogenized, annealed aged” samples comparable. strength ductility slightly improved compared vacuum melted wrought counterparts. dynamic Heat treatment schedule imposed a significant properties. obtained directly aged already comparable Fatigue lower oxygen nitrogen levels. Proper heat treatments led further improvement because elimination intercellular microsegregation.