Understanding the influence of composition on mechanical properties of ultra high strength maraging steels

Paper in proceeding, 2008

Investigations of precipitation and its development during ageing at 475°C in four maraging steels with different Mo- and Si-contents have been conducted using high resolution techniques such as 3-dimensional atom probe and energy filtered electron microscopy. The precipitation sequence in the steels proved to be quite complex and involved formation of different phases one on the other. Presence of Mo in the steels contributed to a higher complexity of precipitation process and kept the interparticle distance being small up to 100h of ageing. Occurrence of Si promoted formation of Mo-rich precipitates. The influence of phase separation on the mechanical properties of the steels is discussed.